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Harden contract validation, STARTTLS edge cases, and rule output

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This commit is contained in:
nemunaire 2026-04-26 16:39:22 +07:00
commit fa212f0fae
9 changed files with 104 additions and 39 deletions
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7
checker/starttls_smtp.go
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@ -7,6 +7,11 @@ import (
"strings"
)
// EHLOHostname is the hostname sent in the SMTP EHLO command during STARTTLS
// negotiation. Override it at startup (e.g. via -ldflags or programmatically)
// to match the identity of the host running the checker.
var EHLOHostname = "checker.localhost"
func init() {
registerStartTLS("smtp", starttlsSMTP)
registerStartTLS("submission", starttlsSMTP)
@ -20,7 +25,7 @@ func starttlsSMTP(conn net.Conn, sni string) error {
return fmt.Errorf("read greeting: %w", err)
}
if _, err := rw.WriteString("EHLO checker.happydomain.org\r\n"); err != nil {
if _, err := fmt.Fprintf(rw, "EHLO %s\r\n", EHLOHostname); err != nil {
return fmt.Errorf("write ehlo: %w", err)
}
if err := rw.Flush(); err != nil {