certctl/cmd/server/main.go

package main

import (
	"context"
	"crypto"
	"crypto/tls"
	"crypto/x509"
	"encoding/pem"
	"fmt"
	"log/slog"
	"net"
	"net/http"
	"os"
	"os/signal"
	"strconv"
	"strings"
	"syscall"
	"time"

	"github.com/shankar0123/certctl/internal/api/handler"
	"github.com/shankar0123/certctl/internal/api/middleware"
	"github.com/shankar0123/certctl/internal/api/router"
	"github.com/shankar0123/certctl/internal/config"
	discoveryawssm "github.com/shankar0123/certctl/internal/connector/discovery/awssm"
	discoveryazurekv "github.com/shankar0123/certctl/internal/connector/discovery/azurekv"
	discoverygcpsm "github.com/shankar0123/certctl/internal/connector/discovery/gcpsm"
	notifyemail "github.com/shankar0123/certctl/internal/connector/notifier/email"
	notifyopsgenie "github.com/shankar0123/certctl/internal/connector/notifier/opsgenie"
	notifypagerduty "github.com/shankar0123/certctl/internal/connector/notifier/pagerduty"
	notifyslack "github.com/shankar0123/certctl/internal/connector/notifier/slack"
	notifyteams "github.com/shankar0123/certctl/internal/connector/notifier/teams"
	"github.com/shankar0123/certctl/internal/crypto/signer"
	"github.com/shankar0123/certctl/internal/domain"
	"github.com/shankar0123/certctl/internal/repository/postgres"
	"github.com/shankar0123/certctl/internal/scep/intune"
	"github.com/shankar0123/certctl/internal/scheduler"
	"github.com/shankar0123/certctl/internal/service"
)

func main() {
	// Load configuration
	cfg, err := config.Load()
	if err != nil {
		fmt.Fprintf(os.Stderr, "Failed to load configuration: %v\n", err)
		os.Exit(1)
	}

	// Defense-in-depth runtime guard for the auth-type discriminator.
	//
	// G-1 (P1): config.Load() already runs Validate() which rejects "jwt"
	// and any value outside config.ValidAuthTypes() with a dedicated
	// diagnostic. This switch is belt-and-braces — if a future refactor
	// bypasses the validator (test harness, alt config loader, env-var
	// rebinding after Load) the server must not silently boot with an
	// unsupported auth shape. The error path uses fmt.Fprintf because
	// the slog logger is constructed from cfg below this point; we want
	// the failure to be visible regardless of log-level configuration.
	switch config.AuthType(cfg.Auth.Type) {
	case config.AuthTypeAPIKey, config.AuthTypeNone:
		// ok — fall through
	default:
		fmt.Fprintf(os.Stderr,
			"unsupported auth type at runtime: %q (valid: %v) — config validation should have caught this; refusing to start\n",
			cfg.Auth.Type, config.ValidAuthTypes())
		os.Exit(1)
	}

	// Set up structured logging
	logger := slog.New(slog.NewJSONHandler(os.Stdout, &slog.HandlerOptions{
		Level: cfg.GetLogLevel(),
	}))

	logger.Info("certctl server starting",
		"version", "2.0.9",
		"server_host", cfg.Server.Host,
		"server_port", cfg.Server.Port)

	// Bundle-5 / Audit H-007: deprecation WARN when the agent bootstrap
	// token is unset. Pre-Bundle-5 there was no token at all; the v2.0.x
	// default keeps the warn-mode pass-through so existing demo deploys
	// keep working, but operators must set CERTCTL_AGENT_BOOTSTRAP_TOKEN
	// before v2.2.0 lands. This is a one-shot startup line — the
	// per-request path stays silent so a busy registration endpoint
	// doesn't flood the log.
	if cfg.Auth.AgentBootstrapToken == "" {
		logger.Warn("agent bootstrap token unset (CERTCTL_AGENT_BOOTSTRAP_TOKEN) — agents may self-register without authentication; this default will become deny-by-default in v2.2.0; generate one with: openssl rand -hex 32")
	} else {
		logger.Info("agent bootstrap token configured (length redacted; constant-time compare on POST /api/v1/agents)")
	}

	// Initialize database connection pool
	db, err := postgres.NewDB(cfg.Database.URL)
	if err != nil {
		logger.Error("failed to connect to database", "error", err)
		os.Exit(1)
	}
	defer db.Close()
	logger.Info("connected to database")

	// Run migrations
	logger.Info("running migrations", "path", cfg.Database.MigrationsPath)
	if err := postgres.RunMigrations(db, cfg.Database.MigrationsPath); err != nil {
		logger.Error("failed to run migrations", "error", err)
		os.Exit(1)
	}
	logger.Info("migrations completed")

	// Apply baseline seed data.
	//
	// U-3 (P1, cat-u-seed_initdb_schema_drift): pre-U-3 seed.sql was mounted
	// into postgres `/docker-entrypoint-initdb.d/` alongside a hand-curated
	// subset of migrations. Adding a migration that introduced a new column
	// referenced by seed.sql (cat-o-retry_interval_unit_mismatch /
	// policy_rules.severity / etc.) without also updating the compose volume
	// mounts caused initdb to crash on first up. Post-U-3 the compose stack
	// drops all initdb mounts; postgres comes up with empty schema, the
	// server runs RunMigrations above, then this RunSeed call lands the
	// baseline data — all from a single source of truth (this binary).
	// See internal/repository/postgres/db.go::RunSeed for the contract.
	logger.Info("applying baseline seed", "path", cfg.Database.MigrationsPath)
	if err := postgres.RunSeed(db, cfg.Database.MigrationsPath); err != nil {
		logger.Error("failed to apply seed data", "error", err)
		os.Exit(1)
	}
	logger.Info("seed completed")

	// Apply demo overlay seed when CERTCTL_DEMO_SEED=true. Pre-U-3 the demo
	// overlay (deploy/docker-compose.demo.yml) mounted seed_demo.sql into
	// postgres `/docker-entrypoint-initdb.d/`; that broke once U-3 dropped
	// the initdb migration mounts (the demo seed references tables that
	// wouldn't exist at initdb time). The runtime path here is the
	// post-U-3 replacement. Default-off so a vanilla deploy never lands
	// fake-history rows. See postgres.RunDemoSeed for the contract.
	if cfg.Database.DemoSeed {
		logger.Info("applying demo seed (CERTCTL_DEMO_SEED=true)", "path", cfg.Database.MigrationsPath)
		if err := postgres.RunDemoSeed(db, cfg.Database.MigrationsPath); err != nil {
			logger.Error("failed to apply demo seed data", "error", err)
			os.Exit(1)
		}
		logger.Info("demo seed completed")
	}

	// Initialize repositories with real PostgreSQL connection
	auditRepo := postgres.NewAuditRepository(db)
	certificateRepo := postgres.NewCertificateRepository(db)
	issuerRepo := postgres.NewIssuerRepository(db)
	targetRepo := postgres.NewTargetRepository(db)
	agentRepo := postgres.NewAgentRepository(db)
	jobRepo := postgres.NewJobRepository(db)
	policyRepo := postgres.NewPolicyRepository(db)
	notificationRepo := postgres.NewNotificationRepository(db)
	renewalPolicyRepo := postgres.NewRenewalPolicyRepository(db)
	profileRepo := postgres.NewProfileRepository(db)
	teamRepo := postgres.NewTeamRepository(db)
	ownerRepo := postgres.NewOwnerRepository(db)
	logger.Info("initialized all repositories")

	// Initialize dynamic issuer registry.
	// Issuers are loaded from the database (with AES-256-GCM encrypted config).
	// On first boot with an empty database, env var issuers are seeded automatically.
	//
	// M-8 (CWE-916 / CWE-329): the encryption passphrase is passed as a raw
	// string into IssuerService / TargetService / IssuerRegistry. Each call to
	// crypto.EncryptIfKeySet generates a fresh 16-byte PBKDF2 salt and emits a
	// v2 blob (magic 0x02 || salt || nonce || sealed). Decryption auto-detects
	// v1 legacy blobs (no magic) and falls back to the fixed v1 salt for
	// backward compatibility; v1 blobs transparently upgrade to v2 on next
	// write. DO NOT pre-derive the key here with crypto.DeriveKey — that was
	// the v1 fixed-salt behaviour that M-8 removes.
	encryptionKey := cfg.Encryption.ConfigEncryptionKey
	if encryptionKey != "" {
		logger.Info("config encryption enabled (AES-256-GCM, per-ciphertext PBKDF2 salt)")
	} else {
		// C-2 fix: fail closed at startup when database-sourced issuer or target
		// rows exist without a configured encryption key. Previously the server
		// would emit a one-line warning and silently persist new GUI-created
		// configs as plaintext (CWE-311). Refuse to start instead: the operator
		// must either configure CERTCTL_CONFIG_ENCRYPTION_KEY or remove the
		// vulnerable rows before the control plane can boot.
		ctx := context.Background()
		dbIssuers, ierr := issuerRepo.List(ctx)
		if ierr != nil {
			logger.Error("startup check: failed to list issuers", "error", ierr)
			os.Exit(1)
		}
		dbTargets, terr := targetRepo.List(ctx)
		if terr != nil {
			logger.Error("startup check: failed to list targets", "error", terr)
			os.Exit(1)
		}
		var dbIssuerCount, dbTargetCount int
		for _, iss := range dbIssuers {
			if iss != nil && iss.Source == "database" {
				dbIssuerCount++
			}
		}
		for _, tgt := range dbTargets {
			if tgt != nil && tgt.Source == "database" {
				dbTargetCount++
			}
		}
		if dbIssuerCount > 0 || dbTargetCount > 0 {
			logger.Error(
				"startup refused: CERTCTL_CONFIG_ENCRYPTION_KEY is not set but database-sourced configs exist "+
					"(would expose sensitive fields as plaintext, CWE-311). "+
					"Set the encryption key or remove the affected rows before restarting.",
				"database_sourced_issuers", dbIssuerCount,
				"database_sourced_targets", dbTargetCount,
			)
			os.Exit(1)
		}
		logger.Warn("CERTCTL_CONFIG_ENCRYPTION_KEY not set — env-seeded issuers will be stored in plaintext; GUI-created issuers and targets will be rejected until a key is configured")
	}

	issuerRegistry := service.NewIssuerRegistry(logger)

	// Initialize revocation repository
	revocationRepo := postgres.NewRevocationRepository(db)

	// Initialize services (following the dependency graph)
	auditService := service.NewAuditService(auditRepo)
	policyService := service.NewPolicyService(policyRepo, auditService)
	policyService.SetCertRepo(certificateRepo) // D-008: CertificateLifetime arm needs CertificateVersion.NotBefore/NotAfter
	// G-1: RenewalPolicyService — distinct from PolicyService (compliance rules).
	// Drives /api/v1/renewal-policies CRUD; the service layer owns slugify + validation,
	// the repo layer owns sentinel translation for 23505 (name UNIQUE) and 23503
	// (FK-RESTRICT against managed_certificates.renewal_policy_id).
	renewalPolicyService := service.NewRenewalPolicyService(renewalPolicyRepo)
	certificateService := service.NewCertificateService(certificateRepo, policyService, auditService)
	notifierRegistry := make(map[string]service.Notifier)

	// Wire notifier connectors from config
	if cfg.Notifiers.SlackWebhookURL != "" {
		slackNotifier := notifyslack.New(notifyslack.Config{
			WebhookURL:      cfg.Notifiers.SlackWebhookURL,
			ChannelOverride: cfg.Notifiers.SlackChannel,
			Username:        cfg.Notifiers.SlackUsername,
		})
		notifierRegistry["Slack"] = slackNotifier
		logger.Info("Slack notifier enabled")
	}
	if cfg.Notifiers.TeamsWebhookURL != "" {
		teamsNotifier := notifyteams.New(notifyteams.Config{
			WebhookURL: cfg.Notifiers.TeamsWebhookURL,
		})
		notifierRegistry["Teams"] = teamsNotifier
		logger.Info("Teams notifier enabled")
	}
	if cfg.Notifiers.PagerDutyRoutingKey != "" {
		pdNotifier := notifypagerduty.New(notifypagerduty.Config{
			RoutingKey: cfg.Notifiers.PagerDutyRoutingKey,
			Severity:   cfg.Notifiers.PagerDutySeverity,
		})
		notifierRegistry["PagerDuty"] = pdNotifier
		logger.Info("PagerDuty notifier enabled")
	}
	if cfg.Notifiers.OpsGenieAPIKey != "" {
		ogNotifier := notifyopsgenie.New(notifyopsgenie.Config{
			APIKey:   cfg.Notifiers.OpsGenieAPIKey,
			Priority: cfg.Notifiers.OpsGeniePriority,
		})
		notifierRegistry["OpsGenie"] = ogNotifier
		logger.Info("OpsGenie notifier enabled")
	}

	// Wire email notifier if SMTP is configured
	var emailAdapter *notifyemail.NotifierAdapter
	if cfg.Notifiers.SMTPHost != "" && cfg.Notifiers.SMTPFromAddress != "" {
		emailConnector := notifyemail.New(&notifyemail.Config{
			SMTPHost:    cfg.Notifiers.SMTPHost,
			SMTPPort:    cfg.Notifiers.SMTPPort,
			Username:    cfg.Notifiers.SMTPUsername,
			Password:    cfg.Notifiers.SMTPPassword,
			FromAddress: cfg.Notifiers.SMTPFromAddress,
			UseTLS:      cfg.Notifiers.SMTPUseTLS,
		}, logger)
		emailAdapter = notifyemail.NewNotifierAdapter(emailConnector)
		notifierRegistry["Email"] = emailAdapter
		logger.Info("Email notifier enabled",
			"smtp_host", cfg.Notifiers.SMTPHost,
			"smtp_port", cfg.Notifiers.SMTPPort,
			"from", cfg.Notifiers.SMTPFromAddress)
	}

	notificationService := service.NewNotificationService(notificationRepo, notifierRegistry)
	notificationService.SetOwnerRepo(ownerRepo)

	// Create RevocationSvc with its dependencies
	revocationSvc := service.NewRevocationSvc(certificateRepo, revocationRepo, auditService)
	revocationSvc.SetIssuerRegistry(issuerRegistry)
	revocationSvc.SetNotificationService(notificationService)

	// Create CAOperationsSvc with its dependencies
	caOperationsSvc := service.NewCAOperationsSvc(revocationRepo, certificateRepo, profileRepo)
	caOperationsSvc.SetIssuerRegistry(issuerRegistry)

	// Bundle CRL/OCSP-Responder: wire CRL cache + OCSP responder
	// repositories. The CRL cache lets the HTTP CRL endpoint serve from
	// pre-generated bytes (Phase 3). The OCSP responder repo lets the
	// local issuer bootstrap a dedicated responder cert per RFC 6960
	// §2.6 instead of signing OCSP with the CA key directly (Phase 2).
	//
	// The signer.FileDriver is the production driver; it provides keys
	// to the responder bootstrap path. Future drivers (PKCS#11, cloud
	// KMS) plug in via the same Driver interface without changing this
	// wiring. The DirHardener / Marshaler hooks stay nil here — the
	// bootstrap path's GenerateOutPath sets the destination per
	// responder; the local issuer's existing keystore.ensureKeyDirSecure
	// equivalent is invoked by FileDriver.Generate when DirHardener is
	// supplied at the call site.
	crlCacheRepo := postgres.NewCRLCacheRepository(db)
	ocspResponderRepo := postgres.NewOCSPResponderRepository(db)
	signerDriver := &signer.FileDriver{}
	issuerRegistry.SetLocalIssuerDeps(&service.LocalIssuerDeps{
		OCSPResponderRepo: ocspResponderRepo,
		SignerDriver:      signerDriver,
		KeyDir:            cfg.OCSPResponder.KeyDir,
		RotationGrace:     cfg.OCSPResponder.RotationGrace,
		Validity:          cfg.OCSPResponder.Validity,
	})
	crlCacheService := service.NewCRLCacheService(crlCacheRepo, caOperationsSvc, issuerRegistry, logger)

	// Wire sub-services into CertificateService
	certificateService.SetRevocationSvc(revocationSvc)
	certificateService.SetCAOperationsSvc(caOperationsSvc)
	// CRL cache makes GenerateDERCRL serve from the pre-generated cache
	// instead of regenerating per request (CRL/OCSP-Responder Phase 4).
	certificateService.SetCRLCacheSvc(crlCacheService)
	certificateService.SetTargetRepo(targetRepo)
	certificateService.SetJobRepo(jobRepo)
	certificateService.SetKeygenMode(cfg.Keygen.Mode)
	renewalService := service.NewRenewalService(certificateRepo, jobRepo, renewalPolicyRepo, profileRepo, auditService, notificationService, issuerRegistry, cfg.Keygen.Mode)
	renewalService.SetTargetRepo(targetRepo)
	deploymentService := service.NewDeploymentService(jobRepo, targetRepo, agentRepo, certificateRepo, auditService, notificationService)
	jobService := service.NewJobService(jobRepo, certificateRepo, ownerRepo, renewalService, deploymentService, logger)
	// I-001: emit "job_retry" audit events when the scheduler resets Failed→Pending.
	// SetAuditService is optional — JobService falls back to nil-guarded no-op if unwired.
	jobService.SetAuditService(auditService)
	agentService := service.NewAgentService(agentRepo, certificateRepo, jobRepo, targetRepo, auditService, issuerRegistry, renewalService)
	agentService.SetProfileRepo(profileRepo)
	issuerService := service.NewIssuerService(issuerRepo, auditService, issuerRegistry, encryptionKey, logger)

	// Seed issuers from env vars on first boot (empty database only), then build registry
	issuerService.SeedFromEnvVars(context.Background(), cfg)
	if err := issuerService.BuildRegistry(context.Background()); err != nil {
		logger.Error("failed to build issuer registry from database", "error", err)
	}
	logger.Info("issuer registry loaded", "issuers", issuerRegistry.Len())
	targetService := service.NewTargetService(targetRepo, auditService, agentRepo, encryptionKey, logger)
	profileService := service.NewProfileService(profileRepo, auditService)
	teamService := service.NewTeamService(teamRepo, auditService)
	ownerService := service.NewOwnerService(ownerRepo, auditService)
	agentGroupRepo := postgres.NewAgentGroupRepository(db)
	agentGroupService := service.NewAgentGroupService(agentGroupRepo, auditService)
	discoveryRepo := postgres.NewDiscoveryRepository(db)
	discoveryService := service.NewDiscoveryService(discoveryRepo, certificateRepo, auditService)
	networkScanRepo := postgres.NewNetworkScanRepository(db)
	networkScanService := service.NewNetworkScanService(networkScanRepo, discoveryService, auditService, logger)
	logger.Info("initialized network scan service")

	// Ensure the sentinel "server-scanner" agent exists for network discovery dedup.
	// This agent ID is used as the agent_id in discovered_certificates for network-scanned certs.
	if cfg.NetworkScan.Enabled {
		sentinelAgent := &domain.Agent{
			ID:     service.SentinelAgentID,
			Name:   "Network Scanner (Server-Side)",
			Status: domain.AgentStatusOnline,
		}
		// M-6: use CreateIfNotExists so duplicate rows on restart/upgrade are
		// idempotent without swallowing unrelated DB failures (CWE-662).
		created, err := agentRepo.CreateIfNotExists(context.Background(), sentinelAgent)
		if err != nil {
			logger.Error("sentinel agent creation failed", "id", service.SentinelAgentID, "error", err)
		} else if created {
			logger.Info("sentinel agent created", "id", service.SentinelAgentID)
		} else {
			logger.Debug("sentinel agent already exists", "id", service.SentinelAgentID)
		}
	}

	// Initialize cloud discovery sources (M50)
	var cloudDiscoveryService *service.CloudDiscoveryService
	if cfg.CloudDiscovery.Enabled {
		cloudDiscoveryService = service.NewCloudDiscoveryService(discoveryService, logger)

		// AWS Secrets Manager
		if cfg.CloudDiscovery.AWSSM.Enabled {
			awsSource := discoveryawssm.New(&cfg.CloudDiscovery.AWSSM, logger)
			cloudDiscoveryService.RegisterSource(awsSource)
			// Create sentinel agent for AWS SM
			sentinelAWS := &domain.Agent{
				ID:     service.SentinelAWSSecretsMgr,
				Name:   "AWS Secrets Manager Discovery",
				Status: domain.AgentStatusOnline,
			}
			// M-6: idempotent create (CWE-662).
			created, err := agentRepo.CreateIfNotExists(context.Background(), sentinelAWS)
			if err != nil {
				logger.Error("sentinel agent creation failed", "id", service.SentinelAWSSecretsMgr, "error", err)
			} else if created {
				logger.Info("sentinel agent created", "id", service.SentinelAWSSecretsMgr)
			} else {
				logger.Debug("sentinel agent already exists", "id", service.SentinelAWSSecretsMgr)
			}
		}

		// Azure Key Vault
		if cfg.CloudDiscovery.AzureKV.Enabled {
			azureSource := discoveryazurekv.New(discoveryazurekv.Config{
				VaultURL:     cfg.CloudDiscovery.AzureKV.VaultURL,
				TenantID:     cfg.CloudDiscovery.AzureKV.TenantID,
				ClientID:     cfg.CloudDiscovery.AzureKV.ClientID,
				ClientSecret: cfg.CloudDiscovery.AzureKV.ClientSecret,
			}, logger)
			cloudDiscoveryService.RegisterSource(azureSource)
			sentinelAzure := &domain.Agent{
				ID:     service.SentinelAzureKeyVault,
				Name:   "Azure Key Vault Discovery",
				Status: domain.AgentStatusOnline,
			}
			// M-6: idempotent create (CWE-662).
			created, err := agentRepo.CreateIfNotExists(context.Background(), sentinelAzure)
			if err != nil {
				logger.Error("sentinel agent creation failed", "id", service.SentinelAzureKeyVault, "error", err)
			} else if created {
				logger.Info("sentinel agent created", "id", service.SentinelAzureKeyVault)
			} else {
				logger.Debug("sentinel agent already exists", "id", service.SentinelAzureKeyVault)
			}
		}

		// GCP Secret Manager
		if cfg.CloudDiscovery.GCPSM.Enabled {
			gcpSource := discoverygcpsm.New(&cfg.CloudDiscovery.GCPSM, logger)
			cloudDiscoveryService.RegisterSource(gcpSource)
			sentinelGCP := &domain.Agent{
				ID:     service.SentinelGCPSecretMgr,
				Name:   "GCP Secret Manager Discovery",
				Status: domain.AgentStatusOnline,
			}
			// M-6: idempotent create (CWE-662).
			created, err := agentRepo.CreateIfNotExists(context.Background(), sentinelGCP)
			if err != nil {
				logger.Error("sentinel agent creation failed", "id", service.SentinelGCPSecretMgr, "error", err)
			} else if created {
				logger.Info("sentinel agent created", "id", service.SentinelGCPSecretMgr)
			} else {
				logger.Debug("sentinel agent already exists", "id", service.SentinelGCPSecretMgr)
			}
		}

		logger.Info("cloud discovery enabled",
			"sources", cloudDiscoveryService.SourceCount(),
			"interval", cfg.CloudDiscovery.Interval.String())
	}

	logger.Info("initialized all services")

	// Initialize bulk revocation service
	bulkRevocationService := service.NewBulkRevocationService(revocationSvc, certificateRepo, auditService, logger)

	// L-1 master (cat-l-fa0c1ac07ab5 + cat-l-8a1fb258a38a): bulk-renew
	// and bulk-reassign services. Mirror BulkRevocationService wiring so
	// the construction site is co-located with the existing bulk endpoint.
	// keygenMode is threaded so bulk-renew jobs land in the same initial
	// status (AwaitingCSR vs Pending) as single-cert TriggerRenewal.
	bulkRenewalService := service.NewBulkRenewalService(certificateRepo, jobRepo, auditService, logger, cfg.Keygen.Mode)
	bulkReassignmentService := service.NewBulkReassignmentService(certificateRepo, ownerRepo, auditService, logger)

	// Initialize stats and metrics services
	statsService := service.NewStatsService(certificateRepo, jobRepo, agentRepo)
	// I-005: wire the notification repository so DashboardSummary.NotificationsDead
	// is populated, which in turn drives the Prometheus counter
	// certctl_notification_dead_total in GetPrometheusMetrics. Setter
	// pattern keeps NewStatsService's nine call sites (main.go + stats_test.go
	// + 8 digest_test.go sites) untouched.
	statsService.SetNotifRepo(notificationRepo)
	logger.Info("initialized stats service")

	// Initialize API handlers
	certificateHandler := handler.NewCertificateHandler(certificateService)
	issuerHandler := handler.NewIssuerHandler(issuerService)
	targetHandler := handler.NewTargetHandler(targetService)
	agentHandler := handler.NewAgentHandler(agentService, cfg.Auth.AgentBootstrapToken)
	jobHandler := handler.NewJobHandler(jobService)
	policyHandler := handler.NewPolicyHandler(policyService)
	// G-1: RenewalPolicyHandler — /api/v1/renewal-policies CRUD. Value-returning
	// constructor matches the house pattern (PolicyHandler, IssuerHandler etc.);
	// the registry stores it by value in HandlerRegistry.RenewalPolicies.
	renewalPolicyHandler := handler.NewRenewalPolicyHandler(renewalPolicyService)
	profileHandler := handler.NewProfileHandler(profileService)
	teamHandler := handler.NewTeamHandler(teamService)
	ownerHandler := handler.NewOwnerHandler(ownerService)
	agentGroupHandler := handler.NewAgentGroupHandler(agentGroupService)
	auditHandler := handler.NewAuditHandler(auditService)
	notificationHandler := handler.NewNotificationHandler(notificationService)
	statsHandler := handler.NewStatsHandler(statsService)
	metricsHandler := handler.NewMetricsHandler(statsService, time.Now())
	// Bundle-5 / H-006: pass the *sql.DB pool so /ready can probe DB
	// connectivity via PingContext. /health stays shallow (liveness signal).
	healthHandler := handler.NewHealthHandler(cfg.Auth.Type, db)
	// U-3 ride-along (cat-u-no_version_endpoint, P2): the version handler
	// answers GET /api/v1/version with build identity (ldflags Version,
	// VCS commit/dirty/timestamp, Go runtime version). Wired through the
	// no-auth dispatch + audit ExcludePaths below so probes and rollout
	// systems can read it without Bearer credentials and without flooding
	// the audit trail.
	versionHandler := handler.NewVersionHandler()
	discoveryHandler := handler.NewDiscoveryHandler(discoveryService)
	networkScanHandler := handler.NewNetworkScanHandler(networkScanService)
	verificationService := service.NewVerificationService(jobRepo, auditService, logger)
	verificationHandler := handler.NewVerificationHandler(verificationService)
	exportService := service.NewExportService(certificateRepo, auditService)
	exportHandler := handler.NewExportHandler(exportService)

	bulkRevocationHandler := handler.NewBulkRevocationHandler(bulkRevocationService)
	// L-1 master closure: handlers for the new bulk-renew + bulk-reassign
	// endpoints. Both registered via HandlerRegistry below; dispatched
	// through the standard authed middleware chain (no admin gate).
	bulkRenewalHandler := handler.NewBulkRenewalHandler(bulkRenewalService)
	bulkReassignmentHandler := handler.NewBulkReassignmentHandler(bulkReassignmentService)

	// Initialize digest service (requires email notifier)
	var digestService *service.DigestService
	var digestHandler *handler.DigestHandler
	if cfg.Digest.Enabled && emailAdapter != nil {
		digestService = service.NewDigestService(
			statsService, certificateRepo, ownerRepo, emailAdapter, cfg.Digest.Recipients, logger,
		)
		digestHandler = handler.NewDigestHandler(digestService)
		logger.Info("digest service enabled",
			"interval", cfg.Digest.Interval.String(),
			"recipients", len(cfg.Digest.Recipients))
	} else {
		// Create a no-op digest handler for route registration
		digestHandler = handler.NewDigestHandler(nil)
		if cfg.Digest.Enabled && emailAdapter == nil {
			logger.Warn("digest enabled but SMTP not configured — digest emails will not be sent")
		}
	}

	// Initialize health check service (M48)
	var healthCheckService *service.HealthCheckService
	var healthCheckHandler *handler.HealthCheckHandler
	if cfg.HealthCheck.Enabled {
		healthCheckRepo := postgres.NewHealthCheckRepository(db)
		healthCheckService = service.NewHealthCheckService(
			healthCheckRepo,
			auditService,
			logger,
			cfg.HealthCheck.MaxConcurrent,
			time.Duration(cfg.HealthCheck.DefaultTimeout)*time.Millisecond,
			cfg.HealthCheck.HistoryRetention,
			cfg.HealthCheck.AutoCreate,
		)
		healthCheckHandler = handler.NewHealthCheckHandler(healthCheckService)
		logger.Info("health check service enabled",
			"interval", cfg.HealthCheck.CheckInterval.String(),
			"max_concurrent", cfg.HealthCheck.MaxConcurrent)
	} else {
		// Create a no-op health check handler for route registration
		healthCheckHandler = handler.NewHealthCheckHandler(nil)
	}

	logger.Info("initialized all handlers")

	// Create context with cancellation
	ctx, cancel := context.WithCancel(context.Background())
	defer cancel()

	// Initialize scheduler
	sched := scheduler.NewScheduler(
		renewalService,
		jobService,
		agentService,
		notificationService,
		networkScanService,
		logger,
	)

	// Configure scheduler intervals from config
	sched.SetRenewalCheckInterval(cfg.Scheduler.RenewalCheckInterval)
	sched.SetJobProcessorInterval(cfg.Scheduler.JobProcessorInterval)
	// I-001: drive the failed-job retry loop. Runs on start + every RetryInterval
	// (default 5m, CERTCTL_SCHEDULER_RETRY_INTERVAL). Kept adjacent to the job
	// processor setter because they share the JobServicer dependency.
	sched.SetJobRetryInterval(cfg.Scheduler.RetryInterval)
	sched.SetAgentHealthCheckInterval(cfg.Scheduler.AgentHealthCheckInterval)
	sched.SetNotificationProcessInterval(cfg.Scheduler.NotificationProcessInterval)
	// I-005: drive the failed-notification retry sweep. Runs every
	// NotificationRetryInterval (default 2m, CERTCTL_NOTIFICATION_RETRY_INTERVAL)
	// and transitions eligible Failed notifications whose next_retry_at has
	// arrived back to Pending so the notification processor picks them up on
	// its next tick. Kept adjacent to the notification processor setter
	// because they share the NotificationServicer dependency (same placement
	// pattern as I-001's SetJobRetryInterval above).
	sched.SetNotificationRetryInterval(cfg.Scheduler.NotificationRetryInterval)
	// C-1 closure (cat-g-7e38f9708e20 + diff-10xmain-2bf4a0a60388): pre-C-1
	// the SetShortLivedExpiryCheckInterval setter was defined + tested but
	// never called from main.go, so the 30-second hardcoded default in
	// scheduler.NewScheduler was effectively the only value. Operators
	// running short-lived cert workloads with high churn (or low-churn
	// workloads wanting to relax the cadence) had no working knob despite
	// CERTCTL_SHORT_LIVED_EXPIRY_CHECK_INTERVAL being documented. Wire it
	// here alongside the other scheduler-interval setters so the
	// documented env var actually takes effect.
	sched.SetShortLivedExpiryCheckInterval(cfg.Scheduler.ShortLivedExpiryCheckInterval)

	// CRL/OCSP-Responder Phase 3: drive the crlGenerationLoop. The cache
	// service walks every issuer in the registry, regenerates the CRL,
	// and persists into crl_cache. The HTTP /.well-known/pki/crl/ handler
	// reads from the cache via certificateService.GenerateDERCRL (which
	// consults crlCacheService when wired). The loop is gated on the
	// service being non-nil, mirroring how digestService and others are
	// wired conditionally below.
	sched.SetCRLCacheService(crlCacheService)
	sched.SetCRLGenerationInterval(cfg.Scheduler.CRLGenerationInterval)
	logger.Info("CRL pre-generation scheduler enabled",
		"interval", cfg.Scheduler.CRLGenerationInterval.String())

	if cfg.NetworkScan.Enabled {
		sched.SetNetworkScanInterval(cfg.NetworkScan.ScanInterval)
		logger.Info("network scanning enabled", "interval", cfg.NetworkScan.ScanInterval.String())
	}
	if digestService != nil {
		sched.SetDigestService(digestService)
		sched.SetDigestInterval(cfg.Digest.Interval)
		logger.Info("digest scheduler enabled", "interval", cfg.Digest.Interval.String())
	}
	if healthCheckService != nil {
		sched.SetHealthCheckService(healthCheckService)
		sched.SetHealthCheckInterval(cfg.HealthCheck.CheckInterval)
		logger.Info("health check scheduler enabled", "interval", cfg.HealthCheck.CheckInterval.String())
	}
	if cloudDiscoveryService != nil && cloudDiscoveryService.SourceCount() > 0 {
		sched.SetCloudDiscoveryService(cloudDiscoveryService)
		sched.SetCloudDiscoveryInterval(cfg.CloudDiscovery.Interval)
		logger.Info("cloud discovery scheduler enabled",
			"interval", cfg.CloudDiscovery.Interval.String(),
			"sources", cloudDiscoveryService.SourceCount())
	}

	// Wire job timeout reaper (I-003)
	sched.SetJobReaperService(jobService)
	sched.SetJobTimeoutInterval(cfg.Scheduler.JobTimeoutInterval)
	sched.SetAwaitingCSRTimeout(cfg.Scheduler.AwaitingCSRTimeout)
	sched.SetAwaitingApprovalTimeout(cfg.Scheduler.AwaitingApprovalTimeout)
	logger.Info("job timeout reaper enabled",
		"interval", cfg.Scheduler.JobTimeoutInterval.String(),
		"csr_timeout", cfg.Scheduler.AwaitingCSRTimeout.String(),
		"approval_timeout", cfg.Scheduler.AwaitingApprovalTimeout.String())

	// Start scheduler
	logger.Info("starting scheduler")
	startedChan := sched.Start(ctx)
	<-startedChan
	logger.Info("scheduler started")

	// SCEP RFC 8894 + Intune master bundle Phase 9: per-profile SCEPService
	// map shared between the SCEP startup loop (which populates it) and the
	// AdminSCEPIntune handler (which reads from it). We declare it here so
	// the HandlerRegistry below can hand the same map to the admin
	// handler — the SCEP loop adds entries later by reference, and the
	// admin endpoint observes the populated state at request time.
	scepServices := map[string]*service.SCEPService{}

	// Build the API router with all handlers
	apiRouter := router.New()
	apiRouter.RegisterHandlers(router.HandlerRegistry{
		Certificates:     certificateHandler,
		Issuers:          issuerHandler,
		Targets:          targetHandler,
		Agents:           agentHandler,
		Jobs:             jobHandler,
		Policies:         policyHandler,
		RenewalPolicies:  renewalPolicyHandler,
		Profiles:         profileHandler,
		Teams:            teamHandler,
		Owners:           ownerHandler,
		AgentGroups:      agentGroupHandler,
		Audit:            auditHandler,
		Notifications:    notificationHandler,
		Stats:            statsHandler,
		Metrics:          metricsHandler,
		Health:           healthHandler,
		Discovery:        discoveryHandler,
		NetworkScan:      networkScanHandler,
		Verification:     verificationHandler,
		Export:           exportHandler,
		Digest:           *digestHandler,
		HealthChecks:     healthCheckHandler,
		BulkRevocation:   bulkRevocationHandler,
		BulkRenewal:      bulkRenewalHandler,
		BulkReassignment: bulkReassignmentHandler,
		Version:          versionHandler,
		// CRL/OCSP-Responder Phase 5: admin observability endpoint
		// for the scheduler-driven CRL pre-generation cache.
		AdminCRLCache: handler.NewAdminCRLCacheHandler(
			handler.NewAdminCRLCacheServiceImpl(crlCacheRepo, func() []string {
				ids := make([]string, 0, issuerRegistry.Len())
				for id := range issuerRegistry.List() {
					ids = append(ids, id)
				}
				return ids
			}),
		),
		// SCEP RFC 8894 + Intune master bundle Phase 9.2: admin endpoint
		// for the per-profile Intune Monitoring tab. The implementation
		// holds a reference to scepServices declared above; the SCEP
		// startup loop populates the map by PathID during boot, so the
		// handler observes whatever profiles exist at request time. On a
		// deploy without SCEP enabled the map stays empty and the GET
		// stats endpoint returns an empty profiles array.
		AdminSCEPIntune: handler.NewAdminSCEPIntuneHandler(
			handler.NewAdminSCEPIntuneServiceImpl(scepServices),
		),
	})
	// Register EST (RFC 7030) handlers if enabled
	if cfg.EST.Enabled {
		issuerConn, ok := issuerRegistry.Get(cfg.EST.IssuerID)
		if !ok {
			logger.Error("EST issuer not found in registry", "issuer_id", cfg.EST.IssuerID)
			os.Exit(1)
		}
		// Bundle-4 / L-005: validate the issuer can actually serve a CA certificate
		// at startup, not at first request time. ACME / DigiCert / Sectigo etc.
		// return an error from GetCACertPEM because they don't expose a static
		// CA chain; binding EST to one of those would silently degrade enrollment.
		preflightCtx, preflightCancel := context.WithTimeout(context.Background(), 10*time.Second)
		if err := preflightEnrollmentIssuer(preflightCtx, "EST", cfg.EST.IssuerID, issuerConn); err != nil {
			preflightCancel()
			logger.Error("startup refused: EST issuer cannot serve CA certificate", "error", err)
			os.Exit(1)
		}
		preflightCancel()
		estService := service.NewESTService(cfg.EST.IssuerID, issuerConn, auditService, logger)
		estService.SetProfileRepo(profileRepo)
		if cfg.EST.ProfileID != "" {
			estService.SetProfileID(cfg.EST.ProfileID)
		}
		estHandler := handler.NewESTHandler(estService)
		apiRouter.RegisterESTHandlers(estHandler)
		logger.Info("EST server enabled",
			"issuer_id", cfg.EST.IssuerID,
			"profile_id", cfg.EST.ProfileID,
			"endpoints", "/.well-known/est/{cacerts,simpleenroll,simplereenroll,csrattrs}")
	}

	// SCEP RFC 8894 Phase 6.5: union pool of every enabled mTLS profile's
	// trust bundle. Populated inside the SCEP startup block below; passed
	// to the TLS-config builder later so the listener accepts client certs
	// signed by ANY mTLS profile's CA. The handler-layer gate
	// (HandleSCEPMTLS) re-verifies per-profile, so a cert that chains to
	// profile A's bundle cannot enroll against profile B even though it
	// passes the TLS-layer union check. Stays nil when no profile opted in
	// (the TLS config builder treats nil as 'no mTLS').
	var scepMTLSUnionPoolForTLS *x509.CertPool

	// Register SCEP (RFC 8894) handlers if enabled.
	//
	// SCEP RFC 8894 Phase 1.5: multi-profile dispatch. Config.Validate()
	// guarantees cfg.SCEP.Profiles is non-empty when cfg.SCEP.Enabled is true
	// (the legacy single-profile flat fields are merged into Profiles[0] by
	// the backward-compat shim in Load()). Each profile gets its own service
	// + handler instance, registered at /scep (PathID="") or /scep/<PathID>.
	if cfg.SCEP.Enabled {
		// Iterate the profiles and build a {pathID -> handler} map for the
		// router. Each profile triggers the same per-profile preflight gates
		// (challenge password presence, RA pair validity, issuer reachability).
		// Failures log the offending PathID so a multi-profile deploy can
		// pinpoint which profile broke startup.
		//
		// SCEP RFC 8894 + Intune master bundle Phase 6.5: profiles that
		// opt into mTLS via CERTCTL_SCEP_PROFILE_<NAME>_MTLS_ENABLED=true
		// get a parallel sibling-route handler registered at /scep-mtls/
		// <pathID>. The per-profile trust pool gates the inbound client
		// cert chain (verified at the TLS layer against the union pool +
		// re-verified at the handler layer against just THIS profile's
		// bundle to prevent cross-profile bleed-through).
		scepHandlers := make(map[string]handler.SCEPHandler, len(cfg.SCEP.Profiles))
		scepMTLSHandlers := make(map[string]handler.SCEPHandler)
		scepMTLSUnionPool := x509.NewCertPool()
		scepMTLSAnyEnabled := false
		// SCEP RFC 8894 + Intune master bundle Phase 8: per-profile Intune
		// trust anchor holders. We track them here so a single SIGHUP
		// reload-watcher set spans every profile, AND so the deferred
		// stop-watcher cleanup runs once at server shutdown.
		intuneTrustHolders := []*intune.TrustAnchorHolder{}
		intuneStopWatchers := []func(){}
		for i, profile := range cfg.SCEP.Profiles {
			profile := profile // shadow for closure-safety even though no closures escape
			profileLog := logger.With(
				"scep_profile_index", i,
				"scep_profile_pathid", profile.PathID,
				"scep_profile_issuer_id", profile.IssuerID,
			)
			// H-2 fix per profile: fail closed at startup when this profile has
			// no challenge password. preflightSCEPChallengePassword stays
			// unchanged; we just call it once per profile.
			if err := preflightSCEPChallengePassword(true, profile.ChallengePassword); err != nil {
				profileLog.Error(
					"startup refused: SCEP profile has empty challenge password "+
						"(would allow unauthenticated certificate enrollment, CWE-306). "+
						"Set CERTCTL_SCEP_PROFILE_<NAME>_CHALLENGE_PASSWORD or remove the profile.",
					"error", err,
				)
				os.Exit(1)
			}
			// SCEP RFC 8894 Phase 1: per-profile RA cert/key preflight. Same
			// six checks as the legacy single-profile path; reports the
			// offending PathID via the profile-scoped logger.
			if err := preflightSCEPRACertKey(true, profile.RACertPath, profile.RAKeyPath); err != nil {
				profileLog.Error(
					"startup refused: SCEP profile RA cert/key preflight failed "+
						"(RFC 8894 §3.2.2 EnvelopedData + §3.3.2 CertRep require a per-profile RA pair). "+
						"Generate the RA pair per docs/legacy-est-scep.md and set "+
						"CERTCTL_SCEP_PROFILE_<NAME>_RA_CERT_PATH + _RA_KEY_PATH for this profile.",
					"error", err,
				)
				os.Exit(1)
			}
			issuerConn, ok := issuerRegistry.Get(profile.IssuerID)
			if !ok {
				profileLog.Error("SCEP profile issuer not found in registry")
				os.Exit(1)
			}
			// Bundle-4 / L-005: validate the issuer can actually serve a CA
			// certificate. Per profile, in case different profiles bind
			// different issuers.
			preflightCtx, preflightCancel := context.WithTimeout(context.Background(), 10*time.Second)
			if err := preflightEnrollmentIssuer(preflightCtx, "SCEP", profile.IssuerID, issuerConn); err != nil {
				preflightCancel()
				profileLog.Error("startup refused: SCEP profile issuer cannot serve CA certificate", "error", err)
				os.Exit(1)
			}
			preflightCancel()
			scepService := service.NewSCEPService(profile.IssuerID, issuerConn, auditService, profileLog, profile.ChallengePassword)
			scepService.SetProfileRepo(profileRepo)
			scepService.SetPathID(profile.PathID)
			if profile.ProfileID != "" {
				scepService.SetProfileID(profile.ProfileID)
			}
			// SCEP RFC 8894 + Intune master bundle Phase 9.3: publish this
			// service into the shared scepServices map so the AdminSCEPIntune
			// handler can find it by PathID. The map was declared above
			// HandlerRegistry construction; the admin handler holds the
			// same map by reference, so adding here makes the new profile
			// visible at the next admin GET.
			scepServices[profile.PathID] = scepService
			scepHandler := handler.NewSCEPHandler(scepService)
			// SCEP RFC 8894 Phase 2.3: load the per-profile RA pair so the
			// handler can run the new RFC 8894 PKIMessage path. Preflight
			// already validated the pair (file mode 0600 + cert/key match
			// + non-expired + RSA-or-ECDSA). Failure here is a deploy bug
			// the operator needs to know about — fail loud at startup.
			raCert, raKey, err := loadSCEPRAPair(profile.RACertPath, profile.RAKeyPath)
			if err != nil {
				profileLog.Error("startup refused: SCEP profile RA pair load failed despite preflight pass — likely a TOCTOU between preflight + here, or filesystem changed mid-boot", "error", err)
				os.Exit(1)
			}
			scepHandler.SetRAPair(raCert, raKey)

			// SCEP RFC 8894 + Intune master bundle Phase 8: per-profile Intune
			// dispatcher wire-in. Builds the trust-anchor holder, replay cache,
			// and per-device rate limiter; injects them into the SCEPService;
			// starts the SIGHUP reload watcher (one per holder, all responding
			// to the same signal as the existing TLS-cert watcher). Profiles
			// with INTUNE_ENABLED=false skip the entire block, so the cost on
			// non-Intune deploys is exactly one bool check per profile.
			if profile.Intune.Enabled {
				intuneHolder, err := preflightSCEPIntuneTrustAnchor(true, profile.Intune.ConnectorCertPath, profileLog)
				if err != nil {
					profileLog.Error(
						"startup refused: SCEP profile INTUNE trust anchor preflight failed "+
							"(Phase 8.2: required when INTUNE_ENABLED=true). "+
							"Verify the bundle file exists at INTUNE_CONNECTOR_CERT_PATH, "+
							"is readable, parses as PEM, contains ≥1 CERTIFICATE block, "+
							"and none of the bundled certs are past NotAfter (operator-rotated).",
						"error", err,
					)
					os.Exit(1)
				}
				intuneTrustHolders = append(intuneTrustHolders, intuneHolder)
				intuneStopWatchers = append(intuneStopWatchers, intuneHolder.WatchSIGHUP())

				// Replay cache TTL = ChallengeValidity (defaults to 60m via
				// config.go's getEnvDuration default). The cache is sized
				// for the documented 100k-entry production default; smaller
				// is fine, larger tightens the operator's escape hatch.
				replayCache := intune.NewReplayCache(profile.Intune.ChallengeValidity, 0)

				// Per-device rate limiter: honor the per-profile cap
				// (INTUNE_PER_DEVICE_RATE_LIMIT_24H, default 3). The cap can
				// be 0 to disable (limiter then short-circuits all Allow calls
				// to nil). Map cap stays at the 100k default.
				rateLimiter := intune.NewPerDeviceRateLimiter(
					profile.Intune.PerDeviceRateLimit24h,
					24*time.Hour,
					0,
				)

				scepService.SetIntuneIntegration(
					intuneHolder,
					profile.Intune.Audience,
					profile.Intune.ChallengeValidity,
					replayCache,
					rateLimiter,
				)
				profileLog.Info("SCEP profile Intune dispatcher enabled",
					"trust_anchor_path", profile.Intune.ConnectorCertPath,
					"audience", profile.Intune.Audience,
					"challenge_validity", profile.Intune.ChallengeValidity,
					"per_device_rate_limit_24h", profile.Intune.PerDeviceRateLimit24h,
				)
			}

			scepHandlers[profile.PathID] = scepHandler
			endpoint := "/scep"
			if profile.PathID != "" {
				endpoint = "/scep/" + profile.PathID
			}
			profileLog.Info("SCEP profile enabled",
				"endpoint", endpoint+"?operation={GetCACaps,GetCACert,PKIOperation}",
				"challenge_password_set", profile.ChallengePassword != "",
				"ra_cert_path", profile.RACertPath,
				"intune_enabled", profile.Intune.Enabled,
			)

			// SCEP RFC 8894 Phase 6.5: register the mTLS sibling route
			// when this profile opted in. Build a per-profile trust pool
			// from the bundle, share its certs into the union pool the
			// TLS layer uses, and clone the handler with the per-profile
			// pool injected so HandleSCEPMTLS can re-verify the inbound
			// client cert against just THIS profile's bundle.
			if profile.MTLSEnabled {
				perProfilePool, err := preflightSCEPMTLSTrustBundle(true, profile.MTLSClientCATrustBundlePath)
				if err != nil {
					profileLog.Error(
						"startup refused: SCEP profile MTLS trust bundle preflight failed "+
							"(Phase 6.5: required when MTLS_ENABLED=true). "+
							"Verify the bundle file exists at MTLS_CLIENT_CA_TRUST_BUNDLE_PATH, "+
							"is readable, parses as PEM, contains ≥1 CERTIFICATE block, "+
							"and none of the bundled certs are past NotAfter.",
						"error", err,
					)
					os.Exit(1)
				}
				// Add this profile's certs to the union pool the TLS
				// layer uses for VerifyClientCertIfGiven. We re-walk the
				// bundle so the union pool gets exactly the same certs
				// as the per-profile pool (defensive against future
				// pool-mutation refactors).
				bundleBytes, _ := os.ReadFile(profile.MTLSClientCATrustBundlePath)
				rest := bundleBytes
				for {
					var block *pem.Block
					block, rest = pem.Decode(rest)
					if block == nil {
						break
					}
					if block.Type != "CERTIFICATE" {
						continue
					}
					if cert, err := x509.ParseCertificate(block.Bytes); err == nil {
						scepMTLSUnionPool.AddCert(cert)
					}
				}
				scepMTLSAnyEnabled = true

				// Build the parallel sibling-route handler. Same SCEP
				// service + RA pair as the standard route — mTLS is
				// additive, not a replacement.
				mtlsHandler := handler.NewSCEPHandler(scepService)
				mtlsHandler.SetRAPair(raCert, raKey)
				mtlsHandler.SetMTLSTrustPool(perProfilePool)
				scepMTLSHandlers[profile.PathID] = mtlsHandler

				mtlsEndpoint := "/scep-mtls"
				if profile.PathID != "" {
					mtlsEndpoint = "/scep-mtls/" + profile.PathID
				}
				profileLog.Info("SCEP mTLS sibling route enabled",
					"endpoint", mtlsEndpoint,
					"client_ca_trust_bundle", profile.MTLSClientCATrustBundlePath,
				)
			}
		}
		apiRouter.RegisterSCEPHandlers(scepHandlers)
		// SCEP RFC 8894 + Intune master bundle Phase 6.5: register the
		// /scep-mtls sibling routes when at least one profile opted in.
		// scepMTLSHandlers is non-empty only when scepMTLSAnyEnabled is
		// true (the per-profile branch only adds to the map when the
		// profile flag is set), but the explicit gate makes the
		// no-op-when-disabled case obvious in logs.
		if scepMTLSAnyEnabled {
			apiRouter.RegisterSCEPMTLSHandlers(scepMTLSHandlers)
			scepMTLSUnionPoolForTLS = scepMTLSUnionPool
			logger.Info("SCEP mTLS sibling route enabled (Phase 6.5)",
				"mtls_profile_count", len(scepMTLSHandlers),
			)
		}
		logger.Info("SCEP server enabled",
			"profile_count", len(scepHandlers),
			"mtls_profile_count", len(scepMTLSHandlers),
			"intune_profile_count", len(intuneTrustHolders),
		)

		// SCEP RFC 8894 + Intune master bundle Phase 8.5: clean up the
		// SIGHUP watcher goroutines when the server shuts down. We register
		// the stop functions on a deferred sweep so the cleanup runs in
		// LIFO order even if a downstream init step os.Exit(1)s.
		if len(intuneStopWatchers) > 0 {
			defer func() {
				for _, stop := range intuneStopWatchers {
					stop()
				}
			}()
		}
	}

	// Register RFC 5280 CRL and RFC 6960 OCSP handlers under /.well-known/pki/.
	// These are always enabled (no config gate) — revocation data must be
	// reachable to relying parties for any cert certctl issues. The finalHandler
	// routing gate below strips auth middleware for this prefix so browsers,
	// OpenSSL, OCSP stapling sidecars, and mTLS clients can fetch without
	// presenting certctl Bearer tokens.
	apiRouter.RegisterPKIHandlers(certificateHandler)
	logger.Info("PKI endpoints registered",
		"endpoints", "/.well-known/pki/{crl/{issuer_id},ocsp/{issuer_id}/{serial}}")

	logger.Info("registered all API handlers")

	// Build middleware stack.
	//
	// Authentication unification (M-002): every authenticated request now
	// carries a named actor in the request context so audit events record
	// the real key identity instead of the hardcoded "api-key-user" string.
	// Named keys come from CERTCTL_API_KEYS_NAMED (preferred). For backward
	// compatibility CERTCTL_AUTH_SECRET is synthesized into legacy-key-N
	// entries with Admin=false.
	var namedKeys []middleware.NamedAPIKey
	if config.AuthType(cfg.Auth.Type) != config.AuthTypeNone {
		// Translate typed config.NamedAPIKey -> middleware.NamedAPIKey. The
		// two structs are field-compatible but live in different packages to
		// preserve the config→middleware dependency direction.
		for _, nk := range cfg.Auth.NamedKeys {
			namedKeys = append(namedKeys, middleware.NamedAPIKey{
				Name:  nk.Name,
				Key:   nk.Key,
				Admin: nk.Admin,
			})
		}
		// Back-compat: if no named keys but legacy Secret is configured,
		// synthesize named entries so the audit trail still attributes the
		// action (instead of falling back to "api-key-user" / "anonymous").
		if len(namedKeys) == 0 && cfg.Auth.Secret != "" {
			parts := strings.Split(cfg.Auth.Secret, ",")
			idx := 0
			for _, p := range parts {
				p = strings.TrimSpace(p)
				if p == "" {
					continue
				}
				namedKeys = append(namedKeys, middleware.NamedAPIKey{
					Name:  fmt.Sprintf("legacy-key-%d", idx),
					Key:   p,
					Admin: false,
				})
				idx++
			}
			if len(namedKeys) > 0 {
				logger.Warn("CERTCTL_AUTH_SECRET is deprecated — set CERTCTL_API_KEYS_NAMED for named actor attribution and admin gating",
					"synthesized_keys", len(namedKeys))
			}
		}
	}
	authMiddleware := middleware.NewAuthWithNamedKeys(namedKeys)
	corsMiddleware := middleware.NewCORS(middleware.CORSConfig{
		AllowedOrigins: cfg.CORS.AllowedOrigins,
	})

	structuredLogger := middleware.NewLogging(logger)

	// Request body size limit middleware — prevents memory exhaustion attacks (CWE-400)
	bodyLimitMiddleware := middleware.NewBodyLimit(middleware.BodyLimitConfig{
		MaxBytes: cfg.Server.MaxBodySize,
	})
	logger.Info("request body size limit enabled", "max_bytes", cfg.Server.MaxBodySize)

	// Security headers middleware — applies HSTS, X-Frame-Options,
	// X-Content-Type-Options, Referrer-Policy, and a conservative CSP
	// on every response. H-1 closure (cat-s11-missing_security_headers):
	// pre-H-1 the server emitted zero security headers; an attacker
	// could clickjack the dashboard, sniff MIME types on JSON/PEM
	// responses, or load resources from arbitrary origins via inline
	// scripts. Defaults are conservative — see internal/api/middleware/
	// securityheaders.go::SecurityHeadersDefaults() for the rationale
	// per header.
	securityHeadersMiddleware := middleware.SecurityHeaders(middleware.SecurityHeadersDefaults())

	// API audit log middleware — records every API call to the audit trail
	auditAdapter := middleware.NewAuditServiceAdapter(
		func(ctx context.Context, actor string, actorType string, action string, resourceType string, resourceID string, details map[string]interface{}) error {
			return auditService.RecordEvent(ctx, actor, domain.ActorType(actorType), action, resourceType, resourceID, details)
		},
	)
	auditMiddleware := middleware.NewAuditLog(auditAdapter, middleware.AuditConfig{
		// /api/v1/version is excluded for the same reason /health and /ready
		// are: rollout systems and blackbox probes hammer it on a tight
		// interval, and the audit trail's value comes from rare,
		// operator-authored mutations — not from sub-second readonly polls.
		// U-3 ride-along (cat-u-no_version_endpoint, P2).
		ExcludePaths: []string{"/health", "/ready", "/api/v1/version"},
		Logger:       logger,
	})
	logger.Info("API audit logging enabled (excluding /health, /ready, /api/v1/version)")

	middlewareStack := []func(http.Handler) http.Handler{
		middleware.RequestID,
		structuredLogger,
		middleware.Recovery,
		bodyLimitMiddleware,
		securityHeadersMiddleware,
		corsMiddleware,
		authMiddleware,
		auditMiddleware.Middleware,
	}

	// Add rate limiter if enabled
	if cfg.RateLimit.Enabled {
		// Bundle B / Audit M-025: per-user / per-IP keying. PerUser{RPS,Burst}
		// fall back to RPS / BurstSize when zero; see middleware.NewRateLimiter
		// for the bucket-creation contract.
		rateLimiter := middleware.NewRateLimiter(middleware.RateLimitConfig{
			RPS:              cfg.RateLimit.RPS,
			BurstSize:        cfg.RateLimit.BurstSize,
			PerUserRPS:       cfg.RateLimit.PerUserRPS,
			PerUserBurstSize: cfg.RateLimit.PerUserBurstSize,
		})
		middlewareStack = []func(http.Handler) http.Handler{
			middleware.RequestID,
			structuredLogger,
			middleware.Recovery,
			bodyLimitMiddleware,
			rateLimiter,
			corsMiddleware,
			authMiddleware,
			auditMiddleware.Middleware,
		}
		logger.Info("rate limiting enabled", "rps", cfg.RateLimit.RPS, "burst", cfg.RateLimit.BurstSize)
	}

	if config.AuthType(cfg.Auth.Type) == config.AuthTypeNone {
		logger.Warn("authentication disabled (CERTCTL_AUTH_TYPE=none) — not suitable for production except behind an authenticating gateway (oauth2-proxy / Envoy ext_authz / Traefik ForwardAuth / Pomerium)")
	} else {
		logger.Info("authentication enabled", "type", cfg.Auth.Type)
	}

	if cfg.Keygen.Mode == "server" {
		logger.Warn("server-side key generation enabled (CERTCTL_KEYGEN_MODE=server) — private keys touch control plane, demo only")
	} else {
		logger.Info("agent-side key generation enabled — private keys never leave agent infrastructure")
	}

	// Apply middleware to API router
	apiHandler := middleware.Chain(apiRouter, middlewareStack...)

	// Wrap with dashboard static file serving
	// Vite builds to web/dist/; fall back to web/ for legacy single-file SPA
	var finalHandler http.Handler
	webDir := "./web/dist"
	if _, err := os.Stat(webDir + "/index.html"); err != nil {
		webDir = "./web"
	}
	// Health/ready routes + EST/SCEP/PKI unauth surface bypass the full
	// middleware stack (no auth required). These are registered on the
	// inner router without auth, but the outer middleware chain wraps
	// everything. Route them directly to the inner router.
	//
	// H-1 closure (cat-s5-4936a1cf0118): pre-H-1 the noAuthHandler chain
	// was RequestID → structuredLogger → Recovery only — missing
	// bodyLimitMiddleware that the authed apiHandler chain has. The
	// unauth surface includes EST simpleenroll/simplereenroll (RFC 7030),
	// SCEP, PKI CRL/OCSP (/.well-known/pki/*), and /health|/ready —
	// every one of which accepts a request body. Without a body-size
	// cap, an unauthenticated client can send arbitrary-size payloads
	// (CSRs, CRL/OCSP requests) and trigger memory pressure on the
	// server before the handler ever rejects the input. Post-H-1 the
	// same bodyLimitMiddleware that wraps the authed surface also wraps
	// the unauth surface — same default cap (CERTCTL_MAX_BODY_SIZE,
	// default 1MB), same 413 response on overflow.
	//
	// Bundle C / Audit M-020 (CWE-770): rate limiter added to the noAuth
	// chain. Pre-bundle the unauth surface had NO rate limit — an attacker
	// could DoS the OCSP responder, which for fail-open relying parties
	// constitutes a revocation bypass (every cert appears valid when the
	// responder is unreachable). The same per-key keyed bucket from
	// Bundle B / M-025 is reused; the per-source-IP keying applies because
	// none of these endpoints are authenticated.
	noAuthMiddleware := []func(http.Handler) http.Handler{
		middleware.RequestID,
		structuredLogger,
		middleware.Recovery,
		bodyLimitMiddleware,
		securityHeadersMiddleware,
	}
	if cfg.RateLimit.Enabled {
		noAuthRateLimiter := middleware.NewRateLimiter(middleware.RateLimitConfig{
			RPS:       cfg.RateLimit.RPS,
			BurstSize: cfg.RateLimit.BurstSize,
		})
		noAuthMiddleware = append(noAuthMiddleware, noAuthRateLimiter)
	}
	noAuthHandler := middleware.Chain(apiRouter, noAuthMiddleware...)

	dashboardEnabled := false
	if _, err := os.Stat(webDir + "/index.html"); err == nil {
		dashboardEnabled = true
	}
	finalHandler = buildFinalHandler(apiHandler, noAuthHandler, webDir, dashboardEnabled)
	if dashboardEnabled {
		logger.Info("dashboard available at /", "web_dir", webDir)
	} else {
		logger.Info("dashboard directory not found, serving API only")
	}

	// HTTPS-everywhere milestone §2.1: fail-loud if the TLS configuration is
	// missing or malformed. Duplicates config.Validate() for defense in depth
	// (same pattern as preflightSCEPChallengePassword).
	if err := preflightServerTLS(cfg.Server.TLS.CertPath, cfg.Server.TLS.KeyPath); err != nil {
		logger.Error("startup refused: HTTPS cert unusable; control plane is HTTPS-only",
			"error", err,
			"cert_path", cfg.Server.TLS.CertPath,
			"key_path", cfg.Server.TLS.KeyPath)
		os.Exit(1)
	}

	// Load the cert+key into a SIGHUP-reloadable holder. Any subsequent
	// SIGHUP triggers a fresh read and atomic swap so rotations do not need
	// a restart. Reload failures keep the previous cert and log a warning.
	tlsCertHolder, err := newCertHolder(cfg.Server.TLS.CertPath, cfg.Server.TLS.KeyPath)
	if err != nil {
		logger.Error("startup refused: failed to load TLS cert holder",
			"error", err,
			"cert_path", cfg.Server.TLS.CertPath,
			"key_path", cfg.Server.TLS.KeyPath)
		os.Exit(1)
	}
	stopTLSWatcher := tlsCertHolder.watchSIGHUP(logger)
	defer stopTLSWatcher()

	// Server configuration
	addr := net.JoinHostPort(cfg.Server.Host, strconv.Itoa(cfg.Server.Port))
	httpServer := &http.Server{
		Addr:    addr,
		Handler: finalHandler,
		// SCEP RFC 8894 + Intune master bundle Phase 6.5: when at least
		// one SCEP profile opted into mTLS, the listener carries the
		// union of every enabled profile's client-CA trust bundle and
		// negotiates VerifyClientCertIfGiven on the handshake. The
		// /scep route stays challenge-password-only; the /scep-mtls
		// sibling route gates additionally on the verified client cert.
		// nil pool = no profile opted in = identical TLS shape to the
		// pre-Phase-6.5 buildServerTLSConfig path.
		TLSConfig:         buildServerTLSConfigWithMTLS(tlsCertHolder, scepMTLSUnionPoolForTLS),
		ReadTimeout:       30 * time.Second,
		ReadHeaderTimeout: 5 * time.Second,
		WriteTimeout:      120 * time.Second, // Must accommodate ACME issuance (order + challenge + finalize)
		IdleTimeout:       60 * time.Second,
	}

	// Start HTTPS server in background. ListenAndServeTLS is called with
	// empty cert+key arguments because the cert is sourced through
	// TLSConfig.GetCertificate (the SIGHUP-reloadable holder). Passing file
	// paths here would pin the first-loaded cert and defeat hot reload.
	logger.Info("HTTPS server listening",
		"address", addr,
		"cert_path", cfg.Server.TLS.CertPath,
		"min_version", "TLS1.3")
	go func() {
		if err := httpServer.ListenAndServeTLS("", ""); err != nil && err != http.ErrServerClosed {
			logger.Error("HTTPS server error", "error", err)
		}
	}()

	// Wait for shutdown signal
	sigChan := make(chan os.Signal, 1)
	signal.Notify(sigChan, syscall.SIGINT, syscall.SIGTERM)

	sig := <-sigChan
	logger.Info("received shutdown signal", "signal", sig.String())

	// Graceful shutdown.
	//
	// Bundle-5 / Audit M-011: pre-Bundle-5 the timeout was hard-coded
	// 30s, so high-volume operators couldn't extend the audit-flush
	// window without forking the binary. Now configurable via
	// CERTCTL_AUDIT_FLUSH_TIMEOUT_SECONDS (default 30s preserves prior
	// behaviour). The same context governs HTTP server shutdown +
	// scheduler completion + audit flush. WARN-log on deadline exceeded;
	// never exit hard — operator gets visibility, server still completes
	// shutdown.
	shutdownTimeout := time.Duration(cfg.Server.AuditFlushTimeoutSeconds) * time.Second
	if shutdownTimeout <= 0 {
		shutdownTimeout = 30 * time.Second
	}
	logger.Info("graceful shutdown budget", "timeout_seconds", int(shutdownTimeout/time.Second))
	shutdownCtx, shutdownCancel := context.WithTimeout(context.Background(), shutdownTimeout)
	defer shutdownCancel()

	cancel() // Stop scheduler

	// Wait for in-flight scheduler work to complete (up to 30 seconds)
	logger.Info("waiting for scheduler to complete in-flight work")
	if err := sched.WaitForCompletion(30 * time.Second); err != nil {
		logger.Warn("scheduler work did not complete in time", "error", err)
	}

	logger.Info("shutting down HTTPS server")
	if err := httpServer.Shutdown(shutdownCtx); err != nil {
		logger.Error("HTTPS server shutdown error", "error", err)
	}

	// Drain in-flight audit-recording goroutines before closing the DB pool.
	// The audit middleware spawns one goroutine per non-excluded request; those
	// goroutines run detached from the request context and write to the
	// audit_events table via the same *sql.DB. Without this drain, SIGTERM
	// would close the DB pool while recordings were mid-flight, silently
	// dropping audit events (M-1, CWE-662 / CWE-400).
	logger.Info("flushing audit middleware in-flight recordings")
	if err := auditMiddleware.Flush(shutdownCtx); err != nil {
		logger.Warn("audit middleware flush did not complete in time", "error", err)
	}

	// Close database connection
	if err := db.Close(); err != nil {
		logger.Error("error closing database connection", "error", err)
	}

	logger.Info("certctl server stopped")
}

// preflightSCEPChallengePassword enforces the H-2 fix: if SCEP is enabled, a
// non-empty challenge password MUST be configured. Returns a non-nil error
// otherwise so the caller can refuse to start the control plane (CWE-306,
// missing authentication for a critical function).
//
// This helper is extracted so the check can be unit tested without booting
// the full server. The caller (main) is responsible for translating the
// returned error into a structured log line and os.Exit(1).
func preflightSCEPChallengePassword(enabled bool, challengePassword string) error {
	if !enabled {
		return nil
	}
	if challengePassword == "" {
		return fmt.Errorf("SCEP enabled but CERTCTL_SCEP_CHALLENGE_PASSWORD is empty: " +
			"SCEP enrollment would accept any client (CWE-306); " +
			"configure a non-empty shared secret or set CERTCTL_SCEP_ENABLED=false")
	}
	return nil
}

// preflightSCEPMTLSTrustBundle validates a per-profile mTLS client-CA
// trust bundle. SCEP RFC 8894 + Intune master bundle Phase 6.5.
//
// Mirrors preflightSCEPRACertKey's no-op-when-disabled pattern; otherwise
// the checks are:
//
//  1. Path is non-empty (the Validate() refuse covers this too, but
//     preflight reports the specific failure with an actionable error
//     string + os.Exit(1) at the call site).
//  2. File exists + readable.
//  3. PEM-decodes to ≥1 CERTIFICATE block.
//  4. None of the bundled certs is past NotAfter — an expired trust
//     anchor would silently reject every client cert at runtime.
//
// On success, returns the parsed *x509.CertPool ready to inject into the
// per-profile SCEPHandler via SetMTLSTrustPool. Each bundled cert also
// contributes to the union pool that backs the TLS-layer
// VerifyClientCertIfGiven.
func preflightSCEPMTLSTrustBundle(enabled bool, bundlePath string) (*x509.CertPool, error) {
	if !enabled {
		return nil, nil
	}
	if bundlePath == "" {
		return nil, fmt.Errorf("MTLS enabled but trust bundle path empty: " +
			"set CERTCTL_SCEP_PROFILE_<NAME>_MTLS_CLIENT_CA_TRUST_BUNDLE_PATH to a PEM file " +
			"containing the bootstrap-CA certs the operator allows to enroll")
	}
	body, err := os.ReadFile(bundlePath)
	if err != nil {
		return nil, fmt.Errorf("read MTLS trust bundle: %w (path=%s)", err, bundlePath)
	}
	pool := x509.NewCertPool()
	rest := body
	count := 0
	now := time.Now()
	for {
		var block *pem.Block
		block, rest = pem.Decode(rest)
		if block == nil {
			break
		}
		if block.Type != "CERTIFICATE" {
			continue
		}
		cert, err := x509.ParseCertificate(block.Bytes)
		if err != nil {
			return nil, fmt.Errorf("parse MTLS trust bundle cert: %w (path=%s)", err, bundlePath)
		}
		if now.After(cert.NotAfter) {
			return nil, fmt.Errorf("MTLS trust bundle cert expired at %s (subject=%q, path=%s) — replace before restart",
				cert.NotAfter.Format(time.RFC3339), cert.Subject.CommonName, bundlePath)
		}
		pool.AddCert(cert)
		count++
	}
	if count == 0 {
		return nil, fmt.Errorf("MTLS trust bundle contained no CERTIFICATE PEM blocks (path=%s)", bundlePath)
	}
	return pool, nil
}

// preflightSCEPIntuneTrustAnchor validates a per-profile Microsoft Intune
// Certificate Connector signing-cert trust bundle.
//
// SCEP RFC 8894 + Intune master bundle Phase 8.2.
//
// No-op when this profile has Intune disabled (the common case for
// non-Intune SCEP deploys). When enabled:
//
//  1. Path is non-empty (Validate() refuse covers this too; we re-check
//     here so the caller can os.Exit(1) with the specific PathID in the
//     log line).
//  2. File exists + readable.
//  3. PEM-decodes to ≥1 CERTIFICATE block (intune.LoadTrustAnchor enforces
//     this and skips non-CERTIFICATE blocks like accidentally-pasted
//     priv-key blocks).
//  4. None of the bundled certs is past NotAfter — an expired Intune
//     trust anchor would silently reject every Connector challenge at
//     runtime, which is a much worse failure mode than failing fast at
//     boot. intune.LoadTrustAnchor enforces this and surfaces the subject
//     CN in the error message so the operator knows which cert to rotate.
//
// On success returns the freshly-built *intune.TrustAnchorHolder ready to
// inject into the per-profile SCEPService via SetIntuneIntegration. The
// holder also installs the SIGHUP watcher (started by the caller).
func preflightSCEPIntuneTrustAnchor(enabled bool, path string, logger *slog.Logger) (*intune.TrustAnchorHolder, error) {
	if !enabled {
		return nil, nil
	}
	if path == "" {
		return nil, fmt.Errorf("INTUNE enabled but trust anchor path empty: " +
			"set CERTCTL_SCEP_PROFILE_<NAME>_INTUNE_CONNECTOR_CERT_PATH to a PEM bundle " +
			"of the Microsoft Intune Certificate Connector's signing certs")
	}
	holder, err := intune.NewTrustAnchorHolder(path, logger)
	if err != nil {
		return nil, fmt.Errorf("INTUNE trust anchor load failed: %w (path=%s)", err, path)
	}
	return holder, nil
}

// loadSCEPRAPair reads the RA cert PEM + key PEM and returns the parsed
// x509.Certificate + crypto.PrivateKey ready for the SCEP handler's RFC
// 8894 path. Called AFTER preflightSCEPRACertKey passed; failures here
// indicate a TOCTOU race or a filesystem change between preflight and
// the load (rare).
//
// Cert PEM may carry a chain (CA + RA + intermediate); we use the FIRST
// CERTIFICATE block, matching the RFC 8894 §3.5.1 single-cert convention
// for the GetCACert response.
func loadSCEPRAPair(certPath, keyPath string) (*x509.Certificate, crypto.PrivateKey, error) {
	certPEM, err := os.ReadFile(certPath)
	if err != nil {
		return nil, nil, fmt.Errorf("read RA cert: %w", err)
	}
	keyPEM, err := os.ReadFile(keyPath)
	if err != nil {
		return nil, nil, fmt.Errorf("read RA key: %w", err)
	}
	pair, err := tls.X509KeyPair(certPEM, keyPEM)
	if err != nil {
		return nil, nil, fmt.Errorf("parse RA pair: %w", err)
	}
	if len(pair.Certificate) == 0 {
		return nil, nil, fmt.Errorf("RA cert PEM contained no certificate blocks")
	}
	leaf, err := x509.ParseCertificate(pair.Certificate[0])
	if err != nil {
		return nil, nil, fmt.Errorf("parse RA cert: %w", err)
	}
	return leaf, pair.PrivateKey, nil
}

// preflightSCEPRACertKey validates the RA cert/key pair the RFC 8894 SCEP
// path requires. Mirrors preflightSCEPChallengePassword's no-op-when-disabled
// pattern; otherwise the checks are:
//
//  1. Both paths are non-empty (the Validate() refuse covers this too,
//     but preflight reports the specific failure mode + os.Exit(1) so the
//     operator sees a clear log line in addition to the config error).
//  2. The key file mode is 0600 (refuse world-/group-readable RA key —
//     defense-in-depth against credential leak via a misconfigured
//     deploy that leaves /etc/certctl/scep/*.key as 0644).
//  3. Cert PEM parses to exactly one x509.Certificate.
//  4. Key PEM parses to a Go crypto.Signer (RSA or ECDSA — RFC 8894
//     §3.5.2 advertises those as the CMS-compatible algorithms).
//  5. The cert's PublicKey matches the key's Public() — refuses pairs
//     accidentally swapped between profiles in a multi-profile config.
//  6. The cert's NotAfter is in the future — an expired RA cert would
//     fail TLS handshake on EnvelopedData decryption per RFC 5652.
//
// Each check returns a wrapped error; the caller (main) is responsible for
// translating to a structured slog.Error + os.Exit(1) so the helper stays
// unit-testable without booting the full server.
func preflightSCEPRACertKey(enabled bool, raCertPath, raKeyPath string) error {
	if !enabled {
		return nil
	}
	if raCertPath == "" || raKeyPath == "" {
		return fmt.Errorf("SCEP enabled but RA pair missing: " +
			"set CERTCTL_SCEP_RA_CERT_PATH + CERTCTL_SCEP_RA_KEY_PATH " +
			"(RFC 8894 §3.2.2 requires an RA pair so clients can encrypt the " +
			"CSR to the RA cert and the server can sign the CertRep response)")
	}

	// File mode check FIRST so a world-readable key never gets read into the
	// process address space. Ignored on Windows (Stat().Mode() doesn't carry
	// POSIX bits there); the production deploy is Linux per the Dockerfile.
	keyInfo, err := os.Stat(raKeyPath)
	if err != nil {
		return fmt.Errorf("CERTCTL_SCEP_RA_KEY_PATH stat failed: %w (path=%s)", err, raKeyPath)
	}
	mode := keyInfo.Mode().Perm()
	if mode&0o077 != 0 {
		return fmt.Errorf("CERTCTL_SCEP_RA_KEY_PATH has insecure permissions %#o; "+
			"RA private key must be mode 0600 (owner read/write only) — "+
			"chmod 0600 %s and restart", mode, raKeyPath)
	}

	certPEM, err := os.ReadFile(raCertPath)
	if err != nil {
		return fmt.Errorf("CERTCTL_SCEP_RA_CERT_PATH read failed: %w (path=%s)", err, raCertPath)
	}
	keyPEM, err := os.ReadFile(raKeyPath)
	if err != nil {
		return fmt.Errorf("CERTCTL_SCEP_RA_KEY_PATH read failed: %w (path=%s)", err, raKeyPath)
	}

	// tls.X509KeyPair validates that the cert + key parse, share an algorithm,
	// and the cert's PublicKey matches the key's Public() — three of our six
	// checks in a single stdlib call, so we use it rather than re-implementing.
	pair, err := tls.X509KeyPair(certPEM, keyPEM)
	if err != nil {
		return fmt.Errorf("RA cert/key pair invalid: %w "+
			"(cert=%s key=%s) — verify the cert and key are matching halves of "+
			"the same RA pair, both PEM-encoded, with the cert containing exactly "+
			"one CERTIFICATE block and the key containing one PRIVATE KEY block",
			err, raCertPath, raKeyPath)
	}
	if len(pair.Certificate) == 0 {
		// Defensive — tls.X509KeyPair already errors on this, but the contract
		// for the next x509.ParseCertificate call needs the slice non-empty.
		return fmt.Errorf("RA cert PEM at %s contains no certificate blocks", raCertPath)
	}

	// Re-parse the leaf so we can read NotAfter + the public-key alg.
	leaf, err := x509.ParseCertificate(pair.Certificate[0])
	if err != nil {
		return fmt.Errorf("RA cert at %s does not parse as x509: %w", raCertPath, err)
	}
	if time.Now().After(leaf.NotAfter) {
		return fmt.Errorf("RA cert at %s expired at %s — "+
			"generate a fresh RA pair (the SCEP CertRep signature would be "+
			"rejected by every conformant client)", raCertPath, leaf.NotAfter.Format(time.RFC3339))
	}

	// CMS-compatible public-key algorithm gate. RFC 8894 §3.5.2 advertises RSA
	// and AES; the responder cert algorithm pertains to the signature scheme
	// used on the CertRep, which means the cert's PublicKey must be RSA or
	// ECDSA. Catches pre-shared Ed25519 dev keys that micromdm/scep clients
	// reject.
	switch leaf.PublicKeyAlgorithm {
	case x509.RSA, x509.ECDSA:
		// ok — supported by golang.org/x/crypto/ocsp + every SCEP client
	default:
		return fmt.Errorf("RA cert at %s uses unsupported public-key algorithm %s — "+
			"RFC 8894 §3.5.2 CMS signing requires RSA or ECDSA",
			raCertPath, leaf.PublicKeyAlgorithm)
	}

	return nil
}

// preflightEnrollmentIssuer validates at startup that an EST/SCEP-bound issuer
// can actually serve a CA certificate. This closes audit finding L-005:
// pre-Bundle-4 the EST/SCEP startup path verified the issuer existed in the
// registry but did not verify the issuer TYPE could emit a CA cert. An
// operator who bound CERTCTL_EST_ISSUER_ID to an ACME issuer (which does
// not have a static CA cert — see internal/connector/issuer/acme/acme.go::
// GetCACertPEM returning an explicit error) would boot successfully and
// only see failures at the first /est/cacerts request, hiding the misconfig
// for hours/days behind a degraded enrollment surface.
//
// Strategy: call issuerConn.GetCACertPEM(ctx) at startup with a short
// timeout. If the issuer can serve a CA cert (local, vault, openssl,
// stepca, awsacmpca, etc.), the call succeeds and we proceed. If not
// (acme, digicert, sectigo, entrust, googlecas, ejbca, globalsign — most
// vendor-CA issuers that hand back chains per-issuance), the call fails
// loudly with the connector's own error string, and the caller os.Exit(1)s.
//
// Returns nil on success, non-nil error suitable for structured logging
// + os.Exit(1) by the caller. Caller is responsible for the timeout context.
func preflightEnrollmentIssuer(ctx context.Context, protocol, issuerID string, issuerConn service.IssuerConnector) error {
	if issuerConn == nil {
		return fmt.Errorf("%s issuer %q: connector is nil", protocol, issuerID)
	}
	caCertPEM, err := issuerConn.GetCACertPEM(ctx)
	if err != nil {
		return fmt.Errorf("%s issuer %q: cannot serve CA certificate (%w); "+
			"choose an issuer type that exposes a static CA chain "+
			"(local / vault / openssl / stepca / awsacmpca) or disable %s",
			protocol, issuerID, err, protocol)
	}
	if caCertPEM == "" {
		return fmt.Errorf("%s issuer %q: GetCACertPEM returned empty PEM with no error; "+
			"choose an issuer type that exposes a static CA chain", protocol, issuerID)
	}
	return nil
}

// buildFinalHandler builds the outer HTTP dispatch handler that routes incoming
// requests to either the authenticated apiHandler chain or the unauthenticated
// noAuthHandler chain based on URL path prefix. Extracted from main() so the
// dispatch logic can be unit tested without booting the full server stack
// (see cmd/server/finalhandler_test.go).
//
// Dispatch rules (M-001, audit 2026-04-19, option D):
//
//   - /health, /ready, /api/v1/auth/info           → no-auth (probes + login detection)
//   - /api/v1/version                              → no-auth (U-3 ride-along: build identity for rollout/probes)
//   - /.well-known/pki/*                           → no-auth (RFC 5280 CRL, RFC 6960 OCSP)
//   - /.well-known/est/*                           → no-auth (RFC 7030 §3.2.3)
//   - /scep, /scep/*                               → no-auth (RFC 8894 §3.2, CSR challengePassword)
//   - /api/v1/*                                    → auth (Bearer token required)
//   - /assets/*                                    → static file server (dashboard only)
//   - anything else                                → SPA index.html fallback (dashboard only)
//     OR apiHandler (no dashboard)
//
// EST/SCEP clients (IoT devices, 802.1X supplicants, MDM endpoints, network
// appliances) cannot present certctl Bearer tokens, so those endpoints must be
// reachable without the Auth middleware. Authentication is instead enforced by
// CSR signature verification, profile policy gates, and for SCEP the
// challengePassword shared secret (fail-loud gated by preflightSCEPChallengePassword
// above).
//
// webDir must point to a directory containing index.html + assets/ when
// dashboardEnabled is true; it is ignored otherwise.
func buildFinalHandler(apiHandler, noAuthHandler http.Handler, webDir string, dashboardEnabled bool) http.Handler {
	var fileServer http.Handler
	if dashboardEnabled {
		fileServer = http.FileServer(http.Dir(webDir))
	}
	return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
		path := r.URL.Path

		// Health/ready, auth/info, and version bypass auth middleware.
		// Health/ready: Docker/K8s health probes don't carry Bearer tokens.
		// auth/info: React app calls this before login to detect auth mode.
		// version: U-3 ride-along (cat-u-no_version_endpoint) — rollout
		// systems and blackbox probes need build identity without a key.
		if path == "/health" || path == "/ready" || path == "/api/v1/auth/info" || path == "/api/v1/version" {
			noAuthHandler.ServeHTTP(w, r)
			return
		}

		// RFC 5280 CRL and RFC 6960 OCSP live under /.well-known/pki/ and MUST
		// be served unauthenticated — relying parties (browsers, OpenSSL, OCSP
		// stapling sidecars, mTLS clients) cannot present certctl Bearer tokens.
		if strings.HasPrefix(path, "/.well-known/pki") {
			noAuthHandler.ServeHTTP(w, r)
			return
		}

		// RFC 7030 EST endpoints ride the no-auth middleware chain (M-001,
		// option D, audit 2026-04-19). Trust boundary is CSR signature + profile
		// policy, not HTTP Bearer. /.well-known/est/cacerts is explicitly
		// anonymous per RFC 7030 §4.1.1.
		if strings.HasPrefix(path, "/.well-known/est") {
			noAuthHandler.ServeHTTP(w, r)
			return
		}

		// RFC 8894 SCEP rides the no-auth chain (M-001, option D). SCEP clients
		// authenticate via the challengePassword attribute in the PKCS#10 CSR,
		// not via HTTP Bearer tokens. preflightSCEPChallengePassword refuses to
		// start the server if SCEP is enabled without a non-empty shared secret.
		//
		// SCEP RFC 8894 + Intune master bundle Phase 6.5: the sibling
		// /scep-mtls[/<pathID>] route also rides the no-auth chain. Its
		// auth boundary is (a) client cert verified at the TLS layer +
		// re-verified per-profile at the handler layer, plus (b) the
		// challenge password — neither is a Bearer token. The /scepxyz
		// vs /scep-mtls disambiguation: 'xyz' starts with a letter so the
		// HasPrefix(path, "/scep/") gate doesn't match it; 'mtls' is its
		// own dedicated prefix gated below to avoid the same overlap.
		if path == "/scep" || strings.HasPrefix(path, "/scep/") {
			noAuthHandler.ServeHTTP(w, r)
			return
		}
		if path == "/scep-mtls" || strings.HasPrefix(path, "/scep-mtls/") {
			noAuthHandler.ServeHTTP(w, r)
			return
		}

		// Authenticated API routes — full middleware stack including Auth.
		if strings.HasPrefix(path, "/api/v1/") {
			apiHandler.ServeHTTP(w, r)
			return
		}

		if !dashboardEnabled {
			// No dashboard: everything non-special falls through to the
			// authenticated handler (preserves pre-M-001 behavior for API-only
			// deployments).
			apiHandler.ServeHTTP(w, r)
			return
		}

		// Dashboard-present: serve static assets directly, SPA fallback for
		// everything else.
		if strings.HasPrefix(path, "/assets/") {
			fileServer.ServeHTTP(w, r)
			return
		}
		http.ServeFile(w, r, webDir+"/index.html")
	})
}