69 lines
1.3 KiB
Go
69 lines
1.3 KiB
Go
package main
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import (
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"crypto/tls"
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"crypto/x509"
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"encoding/pem"
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"flag"
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"fmt"
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"io/ioutil"
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"net"
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"os"
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"git.sr.ht/~kisom/goutils/die"
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)
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func main() {
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var cfg = &tls.Config{}
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var sysRoot, serverName string
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flag.StringVar(&sysRoot, "ca", "", "provide an alternate CA bundle")
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flag.StringVar(&cfg.ServerName, "sni", cfg.ServerName, "provide an SNI name")
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flag.BoolVar(&cfg.InsecureSkipVerify, "noverify", false, "don't verify certificates")
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flag.Parse()
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if sysRoot != "" {
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pemList, err := ioutil.ReadFile(sysRoot)
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die.If(err)
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roots := x509.NewCertPool()
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if !roots.AppendCertsFromPEM(pemList) {
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fmt.Printf("[!] no valid roots found")
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roots = nil
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}
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cfg.RootCAs = roots
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}
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if serverName != "" {
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cfg.ServerName = serverName
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}
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for _, site := range flag.Args() {
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_, _, err := net.SplitHostPort(site)
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if err != nil {
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site += ":443"
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}
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conn, err := tls.Dial("tcp", site, cfg)
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if err != nil {
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fmt.Println(err.Error())
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os.Exit(1)
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}
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cs := conn.ConnectionState()
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var chain []byte
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for _, cert := range cs.PeerCertificates {
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p := &pem.Block{
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Type: "CERTIFICATE",
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Bytes: cert.Raw,
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}
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chain = append(chain, pem.EncodeToMemory(p)...)
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}
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err = ioutil.WriteFile(site+".pem", chain, 0644)
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die.If(err)
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fmt.Printf("[+] wrote %s.pem.\n", site)
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}
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}
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