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cert.go
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cert.go
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package cert
import (
"bytes"
"crypto/tls"
"crypto/x509"
"encoding/json"
"fmt"
"io/ioutil"
"net"
"net/url"
"os"
"path/filepath"
"strings"
"text/template"
"time"
)
var SkipVerify = false
var UTC = false
var CipherSuite = ""
var cipherSuites = map[string]uint16{
"TLS_RSA_WITH_RC4_128_SHA": tls.TLS_RSA_WITH_RC4_128_SHA,
"TLS_RSA_WITH_3DES_EDE_CBC_SHA": tls.TLS_RSA_WITH_3DES_EDE_CBC_SHA,
"TLS_RSA_WITH_AES_128_CBC_SHA": tls.TLS_RSA_WITH_AES_128_CBC_SHA,
"TLS_RSA_WITH_AES_256_CBC_SHA": tls.TLS_RSA_WITH_AES_256_CBC_SHA,
"TLS_RSA_WITH_AES_128_CBC_SHA256": tls.TLS_RSA_WITH_AES_128_CBC_SHA256,
"TLS_RSA_WITH_AES_128_GCM_SHA256": tls.TLS_RSA_WITH_AES_128_GCM_SHA256,
"TLS_RSA_WITH_AES_256_GCM_SHA384": tls.TLS_RSA_WITH_AES_256_GCM_SHA384,
"TLS_ECDHE_ECDSA_WITH_RC4_128_SHA": tls.TLS_ECDHE_ECDSA_WITH_RC4_128_SHA,
"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA": tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA,
"TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA": tls.TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA,
"TLS_ECDHE_RSA_WITH_RC4_128_SHA": tls.TLS_ECDHE_RSA_WITH_RC4_128_SHA,
"TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA": tls.TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA,
"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA": tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA,
"TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA": tls.TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA,
"TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256": tls.TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256,
"TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256": tls.TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256,
"TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256": tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
"TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256": tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
"TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384": tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
"TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384": tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
"TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305": tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
"TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305": tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
}
var userTempl string
var TimeoutSeconds = 3
func SetUserTempl(templ string) error {
if templ == "" {
return nil
}
path, err := filepath.Abs(templ)
if err != nil {
return err
}
content, err := ioutil.ReadFile(path)
if err != nil {
if !os.IsNotExist(err) {
return err
}
userTempl = templ
return nil
}
userTempl = string(content)
return nil
}
const defaultPort = "443"
func SplitHostPort(hostport string) (string, string, error) {
if strings.Contains(hostport, "://") {
u, err := url.Parse(hostport)
if err != nil {
return "", "", err
}
hostport = u.Host
}
if !strings.Contains(hostport, ":") {
return hostport, defaultPort, nil
}
host, port, err := net.SplitHostPort(hostport)
if err != nil {
return "", "", err
}
if port == "" {
port = defaultPort
}
return host, port, nil
}
type Cert struct {
DomainName string `json:"domainName"`
IP string `json:"ip"`
Port string `json:"port"`
Issuer string `json:"issuer"`
CommonName string `json:"commonName"`
SANs []string `json:"sans"`
NotBefore string `json:"notBefore"`
NotAfter string `json:"notAfter"`
Error string `json:"error"`
certChain []*x509.Certificate
}
func cipherSuite() ([]uint16, error) {
if CipherSuite == "" {
return nil, nil
}
var cs []uint16
cs = []uint16{cipherSuites[CipherSuite]}
if cs[0] == 0 {
return nil, fmt.Errorf("%s is unsupported cipher suite or tls1.3 cipher suite.", CipherSuite)
}
return cs, nil
}
func tlsVersion() uint16 {
if CipherSuite != "" {
return tls.VersionTLS12
}
// Currently TLS 1.3
return 0
}
var serverCert = func(host, port string) ([]*x509.Certificate, string, error) {
d := &net.Dialer{
Timeout: time.Duration(TimeoutSeconds) * time.Second,
}
cs, err := cipherSuite()
if err != nil {
return []*x509.Certificate{{}}, "", err
}
conn, err := tls.DialWithDialer(d, "tcp", host+":"+port, &tls.Config{
InsecureSkipVerify: SkipVerify,
CipherSuites: cs,
MaxVersion: tlsVersion(),
})
if err != nil {
return []*x509.Certificate{{}}, "", err
}
defer conn.Close()
addr := conn.RemoteAddr()
ip, _, _ := net.SplitHostPort(addr.String())
cert := conn.ConnectionState().PeerCertificates
return cert, ip, nil
}
func NewCert(hostport string) *Cert {
host, port, err := SplitHostPort(hostport)
if err != nil {
return &Cert{DomainName: host, Error: err.Error()}
}
certChain, ip, err := serverCert(host, port)
if err != nil {
return &Cert{DomainName: host, Error: err.Error()}
}
cert := certChain[0]
var loc *time.Location
loc = time.Local
if UTC {
loc = time.UTC
}
return &Cert{
DomainName: host,
IP: ip,
Port: port,
Issuer: cert.Issuer.CommonName,
CommonName: cert.Subject.CommonName,
SANs: cert.DNSNames,
NotBefore: cert.NotBefore.In(loc).String(),
NotAfter: cert.NotAfter.In(loc).String(),
Error: "",
certChain: certChain,
}
}
func (c *Cert) Detail() *x509.Certificate {
return c.certChain[0]
}
func (c *Cert) CertChain() []*x509.Certificate {
return c.certChain
}
type Certs []*Cert
var tokens = make(chan struct{}, 128)
func validate(s []string) error {
if len(s) < 1 {
return fmt.Errorf("Input at least one domain name.")
}
return nil
}
func NewCerts(s []string) (Certs, error) {
if err := validate(s); err != nil {
return nil, err
}
type indexer struct {
index int
cert *Cert
}
ch := make(chan *indexer)
for i, d := range s {
go func(i int, d string) {
tokens <- struct{}{}
ch <- &indexer{i, NewCert(d)}
<-tokens
}(i, d)
}
certs := make(Certs, len(s))
for range s {
i := <-ch
certs[i.index] = i.cert
}
return certs, nil
}
const defaultTempl = `{{range .}}DomainName: {{.DomainName}}
IP: {{.IP}}
Port: {{.Port}}
Issuer: {{.Issuer}}
NotBefore: {{.NotBefore}}
NotAfter: {{.NotAfter}}
CommonName: {{.CommonName}}
SANs: {{.SANs}}
Error: {{.Error}}
{{end}}
`
func (certs Certs) String() string {
var b bytes.Buffer
templ := defaultTempl
if userTempl != "" {
templ = userTempl
}
t := template.Must(template.New("default").Parse(templ))
if err := t.Execute(&b, certs); err != nil {
panic(err)
}
return b.String()
}
const markdownTempl = `DomainName | IP | Port | Issuer | NotBefore | NotAfter | CN | SANs | Error
--- | --- | --- | --- | --- | --- | --- | --- | ---
{{range .}}{{.DomainName}} | {{.IP}} | {{.Port}} | {{.Issuer}} | {{.NotBefore}} | {{.NotAfter}} | {{.CommonName}} | {{range .SANs}}{{.}}<br/>{{end}} | {{.Error}}
{{end}}
`
func (certs Certs) escapeStar() Certs {
for _, cert := range certs {
for i, san := range cert.SANs {
cert.SANs[i] = strings.Replace(san, "*", "\\*", -1)
}
}
return certs
}
func (certs Certs) Markdown() string {
var b bytes.Buffer
t := template.Must(template.New("markdown").Parse(markdownTempl))
if err := t.Execute(&b, certs.escapeStar()); err != nil {
panic(err)
}
return b.String()
}
func (certs Certs) JSON() string {
data, err := json.Marshal(certs)
if err != nil {
panic(err)
}
return string(data)
}