caddypki: Disable internal auto-CA when auto_https is disabled (fix #7211) (#7238)

Co-authored-by: Matt Holt <mholt@users.noreply.github.com>

caddyconfig/httpcaddyfile/pkiapp.go

@@ -15,6 +15,8 @@
 package httpcaddyfile
 
 import (
+	"slices"
+
 	"github.com/caddyserver/caddy/v2"
 	"github.com/caddyserver/caddy/v2/caddyconfig"
 	"github.com/caddyserver/caddy/v2/caddyconfig/caddyfile"
@@ -178,6 +180,15 @@ func (st ServerType) buildPKIApp(
 	if _, ok := options["skip_install_trust"]; ok {
 		skipInstallTrust = true
 	}
+
+	// check if auto_https is off - in that case we should not create
+	// any PKI infrastructure even with skip_install_trust directive
+	autoHTTPS := []string{}
+	if ah, ok := options["auto_https"].([]string); ok {
+		autoHTTPS = ah
+	}
+	autoHTTPSOff := slices.Contains(autoHTTPS, "off")
+
 	falseBool := false
 
 	// Load the PKI app configured via global options
@@ -218,7 +229,8 @@ func (st ServerType) buildPKIApp(
 	// if there was no CAs defined in any of the servers,
 	// and we were requested to not install trust, then
 	// add one for the default/local CA to do so
-	if len(pkiApp.CAs) == 0 && skipInstallTrust {
+	// only if auto_https is not completely disabled
+	if len(pkiApp.CAs) == 0 && skipInstallTrust && !autoHTTPSOff {
 		ca := new(caddypki.CA)
 		ca.ID = caddypki.DefaultCAID
 		ca.InstallTrust = &falseBool

modules/caddyhttp/autohttps.go

@@ -265,6 +265,22 @@ func (app *App) automaticHTTPSPhase1(ctx caddy.Context, repl *caddy.Replacer) er
 		}
 	}
 
+	// if all servers have auto_https disabled and no domains need certs,
+	// skip the rest of the TLS automation setup to avoid creating
+	// unnecessary PKI infrastructure and automation policies
+	allServersDisabled := true
+	for _, srv := range app.Servers {
+		if srv.AutoHTTPS == nil || !srv.AutoHTTPS.Disabled {
+			allServersDisabled = false
+			break
+		}
+	}
+
+	if allServersDisabled && len(uniqueDomainsForCerts) == 0 {
+		logger.Debug("all servers have automatic HTTPS disabled and no domains need certificates, skipping TLS automation setup")
+		return nil
+	}
+
 	// we now have a list of all the unique names for which we need certs
 	var internal, tailscale []string
 uniqueDomainsLoop: