115 lines
2.8 KiB
Go
115 lines
2.8 KiB
Go
package handlers
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import (
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"crypto/ecdsa"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"encoding/pem"
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"fmt"
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"io/ioutil"
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"log"
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"math/big"
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"net/http"
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"time"
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"git.klink.asia/paul/certman/views"
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"github.com/jinzhu/gorm"
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)
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func ListCertHandler(db *gorm.DB) http.HandlerFunc {
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return func(w http.ResponseWriter, req *http.Request) {
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v := views.New(req)
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v.Render(w, "cert_list")
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}
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}
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func GenCertHandler(db *gorm.DB) http.HandlerFunc {
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return func(w http.ResponseWriter, req *http.Request) {
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v := views.New(req)
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key, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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log.Fatalf("Could not generate keypair: %s", err)
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}
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caCert, caKey, err := loadX509KeyPair("ca.crt", "ca.key")
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if err != nil {
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v.Render(w, "500")
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log.Fatalf("error loading ca keyfiles: %s", err)
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}
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derBytes, err := CreateCertificate(key, caCert, caKey)
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pem.Encode(w, &pem.Block{Type: "CERTIFICATE", Bytes: derBytes})
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pkBytes := x509.MarshalPKCS1PrivateKey(key)
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pem.Encode(w, &pem.Block{Type: "RSA PRIVATE KEY", Bytes: pkBytes})
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return
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}
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}
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func loadX509KeyPair(certFile, keyFile string) (*x509.Certificate, *rsa.PrivateKey, error) {
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cf, err := ioutil.ReadFile(certFile)
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if err != nil {
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return nil, nil, err
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}
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kf, err := ioutil.ReadFile(keyFile)
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if err != nil {
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return nil, nil, err
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}
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cpb, cr := pem.Decode(cf)
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fmt.Println(string(cr))
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kpb, kr := pem.Decode(kf)
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fmt.Println(string(kr))
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crt, err := x509.ParseCertificate(cpb.Bytes)
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if err != nil {
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return nil, nil, err
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}
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key, err := x509.ParsePKCS1PrivateKey(kpb.Bytes)
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if err != nil {
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return nil, nil, err
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}
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return crt, key, nil
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}
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// CreateCertificate creates a CA-signed certificate
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func CreateCertificate(key interface{}, caCert *x509.Certificate, caKey interface{}) ([]byte, error) {
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subj := caCert.Subject
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// .. except for the common name
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subj.CommonName = "clientName"
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serialNumberLimit := new(big.Int).Lsh(big.NewInt(1), 128)
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serialNumber, err := rand.Int(rand.Reader, serialNumberLimit)
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if err != nil {
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log.Fatalf("Obscure error in cert serial number generation: %s", err)
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}
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template := x509.Certificate{
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SerialNumber: serialNumber,
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Subject: subj,
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NotBefore: time.Now(),
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NotAfter: time.Now().Add(24 * time.Hour * 356 * 5),
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SignatureAlgorithm: x509.SHA256WithRSA,
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//KeyUsage: x509.KeyUsageKeyEncipherment | x509.KeyUsageDigitalSignature | x509.KeyUsageDataEncipherment,
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ExtKeyUsage: []x509.ExtKeyUsage{x509.ExtKeyUsageServerAuth, x509.ExtKeyUsageClientAuth},
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BasicConstraintsValid: true,
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}
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return x509.CreateCertificate(rand.Reader, &template, caCert, publicKey(key), caKey)
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}
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func publicKey(priv interface{}) interface{} {
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switch k := priv.(type) {
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case *rsa.PrivateKey:
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return &k.PublicKey
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case *ecdsa.PrivateKey:
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return &k.PublicKey
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default:
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return nil
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}
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}
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