150 lines
3.7 KiB
Go
150 lines
3.7 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/models"
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"git.klink.asia/paul/certman/services"
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"git.klink.asia/paul/certman/views"
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)
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func ListCertHandler(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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func CreateCertHandler(w http.ResponseWriter, req *http.Request) {
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email := services.SessionStore.GetUserEmail(req)
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certname := req.FormValue("certname")
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user := models.User{}
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err := services.Database.Where(&models.User{Email: email}).Find(&user).Error
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if err != nil {
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fmt.Printf("Could not fetch user for mail %s\n", email)
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}
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// Load CA master certificate
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caCert, caKey, err := loadX509KeyPair("ca.crt", "ca.key")
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if err != nil {
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log.Fatalf("error loading ca keyfiles: %s", err)
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panic(err.Error())
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}
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// Generate Keypair
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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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// Generate Certificate
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derBytes, err := CreateCertificate(key, caCert, caKey)
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// Initialize new client config
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client := models.Client{
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Name: certname,
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PrivateKey: x509.MarshalPKCS1PrivateKey(key),
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Cert: derBytes,
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UserID: user.ID,
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}
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// Insert client into database
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if err := services.Database.Create(&client).Error; err != nil {
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panic(err.Error())
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}
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services.SessionStore.Flash(w, req,
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services.Flash{
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Type: "success",
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Message: "The certificate was created successfully.",
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},
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)
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http.Redirect(w, req, "/certs", http.StatusFound)
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}
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func DownloadCertHandler(w http.ResponseWriter, req *http.Request) {
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//v := views.New(req)
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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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//
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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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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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