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-rw-r--r--modules/caddytls/automation.go23
-rw-r--r--modules/caddytls/tls.go15
2 files changed, 23 insertions, 15 deletions
diff --git a/modules/caddytls/automation.go b/modules/caddytls/automation.go
index fffc0a3..1cfb28c 100644
--- a/modules/caddytls/automation.go
+++ b/modules/caddytls/automation.go
@@ -19,6 +19,7 @@ import (
"errors"
"fmt"
"net/http"
+ "strings"
"time"
"github.com/caddyserver/caddy/v2"
@@ -224,8 +225,10 @@ func (ap *AutomationPolicy) Provision(tlsApp *TLS) error {
// on-demand TLS
var ond *certmagic.OnDemandConfig
if ap.OnDemand {
- // ask endpoint is now required after a number of negligence cases causing abuse
- if !ap.onlyInternalIssuer() && (tlsApp.Automation == nil || tlsApp.Automation.OnDemand == nil || tlsApp.Automation.OnDemand.Ask == "") {
+ // ask endpoint is now required after a number of negligence cases causing abuse;
+ // but is still allowed for explicit subjects (non-wildcard, non-unbounded),
+ // and for the internal issuer since it doesn't cause ACME issuer pressure
+ if ap.isWildcardOrDefault() && !ap.onlyInternalIssuer() && (tlsApp.Automation == nil || tlsApp.Automation.OnDemand == nil || tlsApp.Automation.OnDemand.Ask == "") {
return fmt.Errorf("on-demand TLS cannot be enabled without an 'ask' endpoint to prevent abuse; please refer to documentation for details")
}
ond = &certmagic.OnDemandConfig{
@@ -294,6 +297,22 @@ func (ap *AutomationPolicy) onlyInternalIssuer() bool {
return ok
}
+// isWildcardOrDefault determines if the subjects include any wildcard domains,
+// or is the "default" policy (i.e. no subjects) which is unbounded.
+func (ap *AutomationPolicy) isWildcardOrDefault() bool {
+ isWildcardOrDefault := false
+ if len(ap.Subjects) == 0 {
+ isWildcardOrDefault = true
+ }
+ for _, sub := range ap.Subjects {
+ if strings.HasPrefix(sub, "*") {
+ isWildcardOrDefault = true
+ break
+ }
+ }
+ return isWildcardOrDefault
+}
+
// DefaultIssuers returns empty Issuers (not provisioned) to be used as defaults.
// This function is experimental and has no compatibility promises.
func DefaultIssuers() []certmagic.Issuer {
diff --git a/modules/caddytls/tls.go b/modules/caddytls/tls.go
index 92004b8..486a58c 100644
--- a/modules/caddytls/tls.go
+++ b/modules/caddytls/tls.go
@@ -22,7 +22,6 @@ import (
"log"
"net/http"
"runtime/debug"
- "strings"
"sync"
"time"
@@ -182,8 +181,8 @@ func (t *TLS) Provision(ctx caddy.Context) error {
onDemandRateLimiter.SetWindow(time.Duration(t.Automation.OnDemand.RateLimit.Interval))
} else {
// remove any existing rate limiter
- onDemandRateLimiter.SetMaxEvents(0)
onDemandRateLimiter.SetWindow(0)
+ onDemandRateLimiter.SetMaxEvents(0)
}
// run replacer on ask URL (for environment variables) -- return errors to prevent surprises (#5036)
@@ -260,17 +259,7 @@ func (t *TLS) Start() error {
if t.Automation.OnDemand == nil ||
(t.Automation.OnDemand.Ask == "" && t.Automation.OnDemand.RateLimit == nil) {
for _, ap := range t.Automation.Policies {
- isWildcardOrDefault := false
- if len(ap.Subjects) == 0 {
- isWildcardOrDefault = true
- }
- for _, sub := range ap.Subjects {
- if strings.HasPrefix(sub, "*") {
- isWildcardOrDefault = true
- break
- }
- }
- if ap.OnDemand && isWildcardOrDefault {
+ if ap.OnDemand && ap.isWildcardOrDefault() {
t.logger.Warn("YOUR SERVER MAY BE VULNERABLE TO ABUSE: on-demand TLS is enabled, but no protections are in place",
zap.String("docs", "https://caddyserver.com/docs/automatic-https#on-demand-tls"))
break