Created
December 27, 2021 12:50
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Check TLS (https) certificate
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package main | |
import ( | |
"crypto/tls" | |
"flag" | |
"fmt" | |
"log" | |
"os" | |
"time" | |
) | |
var ( | |
domain *string | |
port *int | |
) | |
type target struct { | |
domain string | |
port int | |
} | |
func init() { | |
domain = flag.String("d", "", "Domain to ckeck.") | |
port = flag.Int("p", 443, "Http port. Default is 443.") | |
} | |
func (t *target) Url() string { | |
if t.port == 0 { | |
return fmt.Sprintf("%s:443", t.domain) | |
} | |
return fmt.Sprintf("%s:%d", t.domain, t.port) | |
} | |
func (t *target) CheckTLS() { | |
conn, err := tls.Dial("tcp", t.Url(), nil) | |
if err != nil { | |
fmt.Println("[ERROR] Server doesn't support SSL certificate err: " + err.Error()) | |
} else { | |
err = conn.VerifyHostname(t.domain) | |
if err != nil { | |
fmt.Println("Hostname doesn't match with certificate: " + err.Error()) | |
} | |
expiry := conn.ConnectionState().PeerCertificates[0].NotAfter | |
fmt.Printf("Issuer: %s\nExpiry: %v\n", conn.ConnectionState().PeerCertificates[0].Issuer, expiry.Format(time.RFC850)) | |
currentTime := time.Now() | |
diff := currentTime.Sub(expiry) | |
if diff > 0 { | |
fmt.Println("EXPIRED!!") | |
} | |
} | |
} | |
func main() { | |
var t target | |
// parse flags from command line | |
flag.Parse() | |
if *domain == "" { | |
log.Println("[ERROR] domain can't be empty.") | |
os.Exit(0) | |
} | |
t = target{domain: *domain, port: *port} | |
t.CheckTLS() | |
} |
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