public async Task <IActionResult> Run(
[HttpTrigger(AuthorizationLevel.Anonymous, "post", Route = "secrets/{managedSecretId:guid}/{nonce}")] HttpRequest req,
Guid managedSecretId,
string nonce,
ILogger log)
{
_ = req; // unused but required for attribute
log.LogInformation("External signal called to check ManagedSecret ID {0} against nonce {1}", managedSecretId, nonce);
var secret = await ManagedSecrets.GetAsync(managedSecretId);
if (secret == null)
{
return(new BadRequestErrorMessageResult("Invalid ManagedSecret ID"));
}
if (!secret.TaskConfirmationStrategies.HasFlag(TaskConfirmationStrategies.ExternalSignal))
{
return(new BadRequestErrorMessageResult("This ManagedSecret cannot be used with External Signals"));
}
if ((await RekeyingTasks.GetAsync(t => t.ManagedSecretId == secret.ObjectId))
.Any(t => t.RekeyingInProgress))
{
return(new OkObjectResult(RETURN_RETRY_SHORTLY));
}
if ((secret.IsValid && secret.TimeRemaining <= TimeSpan.FromHours(ServiceConfiguration.ExternalSignalRekeyableLeadTimeHours)) || !secret.IsValid)
{
var rekeyingTask = new Task(async() =>
{
var task = new RekeyingTask()
{
ManagedSecretId = secret.ObjectId,
Expiry = secret.Expiry,
Queued = DateTimeOffset.UtcNow,
RekeyingInProgress = true
};
await RekeyingTasks.CreateAsync(task);
var rekeyingAttemptLogger = new RekeyingAttemptLogger(log)
{
UserDisplayName = "Agent Identity",
UserEmail = string.Empty
};
try
{
await ExecuteRekeyingWorkflow(task, rekeyingAttemptLogger);
}
catch (Exception ex)
{
rekeyingAttemptLogger.OuterException = JsonConvert.SerializeObject(ex, Formatting.Indented);
}
task.RekeyingInProgress = false;
task.RekeyingCompleted = rekeyingAttemptLogger.IsSuccessfulAttempt;
task.RekeyingFailed = !rekeyingAttemptLogger.IsSuccessfulAttempt;
task.Attempts.Add(rekeyingAttemptLogger);
await RekeyingTasks.UpdateAsync(task);
},
TaskCreationOptions.LongRunning);
rekeyingTask.Start();
if (!rekeyingTask.Wait(TimeSpan.FromSeconds(MAX_EXECUTION_SECONDS_BEFORE_RETRY)))
{
log.LogInformation("Rekeying workflow was started but exceeded the maximum request time! ({0})", TimeSpan.FromSeconds(MAX_EXECUTION_SECONDS_BEFORE_RETRY));
return(new OkObjectResult(RETURN_RETRY_SHORTLY));
}
else
{
log.LogInformation("Completed rekeying workflow within maximum time! ({0})", TimeSpan.FromSeconds(MAX_EXECUTION_SECONDS_BEFORE_RETRY));
return(new OkObjectResult(RETURN_CHANGE_OCCURRED));
}
}
return(new OkObjectResult(RETURN_NO_CHANGE));
}
protected async Task <RekeyingAttemptLogger> ExecuteRekeyingWorkflow(RekeyingTask task, RekeyingAttemptLogger log = null)
{
if (log == null)
{
log = new RekeyingAttemptLogger();
}
MultiCredentialProvider.CredentialType credentialType;
if (task.ConfirmationType == TaskConfirmationStrategies.AdminCachesSignOff)
{
if (task.PersistedCredentialId == default)
{
log.LogError("Cached sign-off is preferred but no credentials were persisted!");
throw new Exception("Cached sign-off is preferred but no credentials were persisted!");
}
var token = await SecureStorageProvider.Retrieve <Azure.Core.AccessToken>(task.PersistedCredentialId);
CredentialProvider.Register(
MultiCredentialProvider.CredentialType.CachedCredential,
token.Token,
token.ExpiresOn);
credentialType = MultiCredentialProvider.CredentialType.CachedCredential;
}
else if (task.ConfirmationType == TaskConfirmationStrategies.AdminSignsOffJustInTime)
{
credentialType = MultiCredentialProvider.CredentialType.UserCredential;
}
else
{
credentialType = MultiCredentialProvider.CredentialType.AgentServicePrincipal;
}
log.LogInformation("Using credential type {0} to access resources", credentialType);
var secret = await ManagedSecrets.GetAsync(task.ManagedSecretId);
log.LogInformation("Beginning rekeying for ManagedSecret '{0}' (ID {1})", secret.Name, secret.ObjectId);
var resources = await Resources.GetAsync(r => secret.ResourceIds.Contains(r.ObjectId));
var workflow = new ProviderActionWorkflow(log,
resources.Select(r => GetProvider(log, r.ProviderType, r.ProviderConfiguration, credentialType)));
try
{
await workflow.InvokeAsync(secret.ValidPeriod);
secret.LastChanged = DateTimeOffset.UtcNow;
await ManagedSecrets.UpdateAsync(secret);
log.LogInformation("Completed rekeying workflow for ManagedSecret '{0}' (ID {1})", secret.Name, secret.ObjectId);
if (credentialType == MultiCredentialProvider.CredentialType.CachedCredential)
{
log.LogInformation("Destroying persisted credential");
await SecureStorageProvider.Destroy(task.PersistedCredentialId);
}
log.LogInformation("Rekeying task completed");
}
catch (Exception ex)
{
log.LogCritical(ex, "Error running rekeying task!");
log.LogCritical(ex.Message);
log.LogCritical(ex.StackTrace);
log.OuterException = JsonConvert.SerializeObject(ex, Formatting.Indented);
}
return(log);
}