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package checkup
import (
"bytes"
"crypto/tls"
"fmt"
"time"
)
func CertExpiresSoon(hostname, port string, window time.Duration) (*tls.Conn, error) {
conn, err := tls.Dial("tcp", hostname+":"+port,
&tls.Config{ServerName: hostname})
if err != nil {
return conn, err
}
t := time.Now().Add(window)
cert := conn.ConnectionState().PeerCertificates[0]
if t.After(cert.NotAfter) {
return conn, fmt.Errorf("Cert expires soon: %s ( %d days )",
cert.NotAfter, (cert.NotAfter.Unix()-time.Now().Unix())/(60*60*24))
}
return conn, err
}
func CertInfo(conn *tls.Conn) string {
buf := &bytes.Buffer{}
cs := conn.ConnectionState()
certs := cs.PeerCertificates
for _, cert := range certs {
fmt.Fprintf(buf, "Permitted: %v\n", cert.DNSNames)
fmt.Fprintf(buf, "Permitted: %v\n", cert.PermittedDNSDomains)
fmt.Fprintf(buf, "Not before: %v\n", cert.NotBefore)
fmt.Fprintf(buf, "Not after: %v\n", cert.NotAfter)
}
return string(buf.Bytes())
}
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