validation: allow up to 200 chars of txt content

joohoi · Feb 23, 2025 · 2702bfb · 2702bfb
1 parent b7a0a8a
commit 2702bfb
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Showing 2 changed files with 4 additions and 2 deletions.
diff --git a/util.go b/util.go
@@ -59,7 +59,7 @@ func prepareConfig(conf DNSConfig) (DNSConfig, error) {
 
 func sanitizeString(s string) string {
 	// URL safe base64 alphabet without padding as defined in ACME
-	re, _ := regexp.Compile(`[^A-Za-z\-\_0-9]+`)
+	re, _ := regexp.Compile(`[^A-Za-z\-\_\.0-9]+`)
 	return re.ReplaceAllString(s, "")
 }
 

diff --git a/validation.go b/validation.go
@@ -33,7 +33,9 @@ func validSubdomain(s string) bool {
 
 func validTXT(s string) bool {
 	sn := sanitizeString(s)
-	if utf8.RuneCountInString(s) == 43 && utf8.RuneCountInString(sn) == 43 {
+	cnt := utf8.RuneCountInString(s)
+	cnt_sn := utf8.RuneCountInString(sn)
+	if (43 <= cnt && cnt <= 200 && cnt_sn == cnt) {
 		// 43 chars is the current LE auth key size, but not limited / defined by ACME
 		return true
 	}