// SessionResumeScan tests that host is able to resume sessions across all addresses.
func sessionResumeScan(addr, hostname string) (grade Grade, output Output, err error) {
config := defaultTLSConfig(hostname)
config.ClientSessionCache = tls.NewLRUClientSessionCache(1)
conn, err := tls.DialWithDialer(Dialer, Network, addr, config)
if err != nil {
return
}
if err = conn.Close(); err != nil {
return
}
return multiscan(addr, func(addrport string) (g Grade, o Output, e error) {
var conn *tls.Conn
if conn, e = tls.DialWithDialer(Dialer, Network, addrport, config); e != nil {
return
}
conn.Close()
if o = conn.ConnectionState().DidResume; o.(bool) {
g = Good
}
return
})
}
// getChain is a helper function that retreives the host's certificate chain.
func getChain(addr string, config *tls.Config) (chain []*x509.Certificate, err error) {
var conn *tls.Conn
conn, err = tls.DialWithDialer(Dialer, Network, addr, config)
if err != nil {
return
}
err = conn.Close()
if err != nil {
return
}
chain = conn.ConnectionState().PeerCertificates
if len(chain) == 0 {
err = fmt.Errorf("%s returned empty certificate chain", addr)
}
return
}
// tlsDialScan tests that the host can perform a TLS Handshake
// and warns if the server's certificate can't be verified.
func tlsDialScan(addr, hostname string) (grade Grade, output Output, err error) {
var conn *tls.Conn
config := defaultTLSConfig(hostname)
if conn, err = tls.DialWithDialer(Dialer, Network, addr, config); err != nil {
return
}
conn.Close()
config.InsecureSkipVerify = false
if conn, err = tls.DialWithDialer(Dialer, Network, addr, config); err != nil {
grade = Warning
return
}
conn.Close()
grade = Good
return
}