Fix HTTPS config for empty/no Caddyfile

This fixes a regression introduced in recent commits that enabled TLS on the default ":2015" config. This fix is possible because On-Demand TLS is no longer implicit; it must be explicitly enabled by the user by setting a maximum number of certificates to issue.

caddy/https/https.go

@@ -95,7 +95,7 @@ func Deactivate() (err error) {
 }
 
 // MarkQualified scans each config and, if it qualifies for managed
-// TLS, it sets the Marked field of the TLSConfig to true.
+// TLS, it sets the Managed field of the TLSConfig to true.
 func MarkQualified(configs []server.Config) {
 	for i := 0; i < len(configs); i++ {
 		if ConfigQualifies(configs[i]) {
@@ -152,9 +152,10 @@ func ObtainCerts(configs []server.Config, allowPrompts, proxyACME bool) error {
 	return nil
 }
 
-// groupConfigsByEmail groups configs by the email address to be used by its
+// groupConfigsByEmail groups configs by the email address to be used by an
-// ACME client. It only includes configs that are marked as fully managed.
+// ACME client. It only groups configs that have TLS enabled and that are
-// If userPresent is true, the operator MAY be prompted for an email address.
+// marked as Managed. If userPresent is true, the operator MAY be prompted
+// for an email address.
 func groupConfigsByEmail(configs []server.Config, userPresent bool) map[string][]server.Config {
 	initMap := make(map[string][]server.Config)
 	for _, cfg := range configs {
@@ -214,7 +215,7 @@ func hostHasOtherPort(allConfigs []server.Config, thisConfigIdx int, otherPort s
 // all configs.
 func MakePlaintextRedirects(allConfigs []server.Config) []server.Config {
 	for i, cfg := range allConfigs {
-		if cfg.TLS.Managed &&
+		if (cfg.TLS.Managed || cfg.TLS.OnDemand) &&
 			!hostHasOtherPort(allConfigs, i, "80") &&
 			(cfg.Port == "443" || !hostHasOtherPort(allConfigs, i, "443")) {
 			allConfigs = append(allConfigs, redirPlaintextHost(cfg))
@@ -224,10 +225,11 @@ func MakePlaintextRedirects(allConfigs []server.Config) []server.Config {
 }
 
 // ConfigQualifies returns true if cfg qualifies for
-// fully managed TLS. It does NOT check to see if a
+// fully managed TLS (but not on-demand TLS, which is
+// not considered here). It does NOT check to see if a
 // cert and key already exist for the config. If the
 // config does qualify, you should set cfg.TLS.Managed
-// to true and use that instead, because the process of
+// to true and check that instead, because the process of
 // setting up the config may make it look like it
 // doesn't qualify even though it originally did.
 func ConfigQualifies(cfg server.Config) bool {
@@ -238,10 +240,8 @@ func ConfigQualifies(cfg server.Config) bool {
 		cfg.Port != "80" &&
 		cfg.TLS.LetsEncryptEmail != "off" &&
 
-		// we get can't certs for some kinds of hostnames,
+		// we get can't certs for some kinds of hostnames
-		// but we CAN get certs at request-time even if
+		HostQualifies(cfg.Host)
-		// the hostname in the config is empty right now.
-		(cfg.Host == "" || HostQualifies(cfg.Host))
 }
 
 // HostQualifies returns true if the hostname alone

caddy/https/https_test.go

@@ -46,7 +46,7 @@ func TestConfigQualifies(t *testing.T) {
 		cfg    server.Config
 		expect bool
 	}{
-		{server.Config{Host: ""}, true},
+		{server.Config{Host: ""}, false},
 		{server.Config{Host: "localhost"}, false},
 		{server.Config{Host: "123.44.3.21"}, false},
 		{server.Config{Host: "example.com"}, true},
@@ -302,6 +302,7 @@ func TestGroupConfigsByEmail(t *testing.T) {
 func TestMarkQualified(t *testing.T) {
 	// TODO: TestConfigQualifies and this test share the same config list...
 	configs := []server.Config{
+		{Host: ""},
 		{Host: "localhost"},
 		{Host: "123.44.3.21"},
 		{Host: "example.com"},
@@ -313,9 +314,8 @@ func TestMarkQualified(t *testing.T) {
 		{Host: "example.com", Port: "1234"},
 		{Host: "example.com", Scheme: "https"},
 		{Host: "example.com", Port: "80", Scheme: "https"},
-		{Host: ""},
 	}
-	expectedManagedCount := 5
+	expectedManagedCount := 4
 
 	MarkQualified(configs)
 

caddy/https/setup.go

@@ -83,6 +83,7 @@ func Setup(c *setup.Controller) (middleware.Middleware, error) {
 				c.TLS.Manual = true
 			case "max_certs":
 				c.Args(&maxCerts)
+				c.TLS.OnDemand = true
 			default:
 				return nil, c.Errf("Unknown keyword '%s'", c.Val())
 			}
@@ -93,21 +94,18 @@ func Setup(c *setup.Controller) (middleware.Middleware, error) {
 			return nil, c.ArgErr()
 		}
 
-		if c.TLS.Manual && maxCerts != "" {
+		// set certificate limit if on-demand TLS is enabled
-			return nil, c.Err("Cannot limit certificate count (max_certs) for manual TLS configurations")
-		}
-
 		if maxCerts != "" {
 			maxCertsNum, err := strconv.Atoi(maxCerts)
-			if err != nil || maxCertsNum < 0 {
+			if err != nil || maxCertsNum < 1 {
 				return nil, c.Err("max_certs must be a positive integer")
 			}
-			if onDemandMaxIssue == 0 || int32(maxCertsNum) < onDemandMaxIssue { // keep the minimum; TODO: This is global; should be per-server or per-vhost...
+			if onDemandMaxIssue == 0 || int32(maxCertsNum) < onDemandMaxIssue { // keep the minimum; TODO: We have to do this because it is global; should be per-server or per-vhost...
 				onDemandMaxIssue = int32(maxCertsNum)
 			}
 		}
 
-		// don't load certificates unless we're supposed to
+		// don't try to load certificates unless we're supposed to
 		if !c.TLS.Enabled || !c.TLS.Manual {
 			continue
 		}

server/config.go

@@ -65,10 +65,11 @@ func (c Config) Address() string {
 
 // TLSConfig describes how TLS should be configured and used.
 type TLSConfig struct {
-	Enabled                  bool
+	Enabled                  bool // will be set to true if TLS is enabled
 	LetsEncryptEmail         string
-	Managed                  bool // will be set to true if config qualifies for automatic, managed TLS
+	Manual                   bool // will be set to true if user provides own certs and keys
-	Manual                   bool // will be set to true if user provides the cert and key files
+	Managed                  bool // will be set to true if config qualifies for automatic/managed HTTPS
+	OnDemand                 bool // will be set to true if user enables on-demand TLS (obtain certs during handshakes)
 	Ciphers                  []uint16
 	ProtocolMinVersion       uint16
 	ProtocolMaxVersion       uint16

server/server.go

@@ -63,14 +63,16 @@ func New(addr string, configs []Config, gracefulTimeout time.Duration) (*Server,
 	var useTLS, useOnDemandTLS bool
 	if len(configs) > 0 {
 		useTLS = configs[0].TLS.Enabled
+		if useTLS {
 			host, _, err := net.SplitHostPort(addr)
 			if err != nil {
 				host = addr
 			}
-		if useTLS && host == "" && !configs[0].TLS.Manual {
+			if host == "" && configs[0].TLS.OnDemand {
 				useOnDemandTLS = true
 			}
 		}
+	}
 
 	s := &Server{
 		Server: &http.Server{