nginx-ui/server/pkg/cert/cert.go

package cert

import (
    "crypto"
    "crypto/ecdsa"
    "crypto/elliptic"
    "crypto/rand"
    "crypto/tls"
    "github.com/0xJacky/Nginx-UI/server/pkg/nginx"
    "github.com/0xJacky/Nginx-UI/server/settings"
    "github.com/go-acme/lego/v4/certcrypto"
    "github.com/go-acme/lego/v4/certificate"
    "github.com/go-acme/lego/v4/challenge/http01"
    "github.com/go-acme/lego/v4/lego"
    "github.com/go-acme/lego/v4/registration"
    "github.com/pkg/errors"
    "log"
    "net/http"
    "os"
    "path/filepath"
    "strings"
)

// MyUser You'll need a user or account type that implements acme.User
type MyUser struct {
    Email        string
    Registration *registration.Resource
    key          crypto.PrivateKey
}

func (u *MyUser) GetEmail() string {
    return u.Email
}
func (u *MyUser) GetRegistration() *registration.Resource {
    return u.Registration
}
func (u *MyUser) GetPrivateKey() crypto.PrivateKey {
    return u.key
}

func IssueCert(domain []string, logChan chan string, errChan chan error) {
    defer func() {
        if err := recover(); err != nil {
            log.Println("Issue Cert recover", err)
        }
    }()

    // Create a user. New accounts need an email and private key to start.
    logChan <- "Generating private key for registering account"
    privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
    if err != nil {
        errChan <- errors.Wrap(err, "issue cert generate key error")
        return
    }

    logChan <- "Preparing lego configurations"
    myUser := MyUser{
        Email: settings.ServerSettings.Email,
        key:   privateKey,
    }

    config := lego.NewConfig(&myUser)

    if settings.ServerSettings.Demo {
        config.CADirURL = "https://acme-staging-v02.api.letsencrypt.org/directory"
    }

    if settings.ServerSettings.CADir != "" {
        config.CADirURL = settings.ServerSettings.CADir
        if config.HTTPClient != nil {
            config.HTTPClient.Transport = &http.Transport{
                TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
            }
        }
    }

    config.Certificate.KeyType = certcrypto.RSA2048

    logChan <- "Creating client facilitates communication with the CA server"
    // A client facilitates communication with the CA server.
    client, err := lego.NewClient(config)
    if err != nil {
        errChan <- errors.Wrap(err, "issue cert new client error")
        return
    }

    logChan <- "Using HTTP01 challenge provider"
    err = client.Challenge.SetHTTP01Provider(
        http01.NewProviderServer("",
            settings.ServerSettings.HTTPChallengePort,
        ),
    )

    if err != nil {
        errChan <- errors.Wrap(err, "issue cert challenge fail")
        return
    }

    // New users will need to register
    logChan <- "Registering user"
    reg, err := client.Registration.Register(registration.RegisterOptions{TermsOfServiceAgreed: true})
    if err != nil {
        errChan <- errors.Wrap(err, "issue cert register fail")
        return
    }
    myUser.Registration = reg

    request := certificate.ObtainRequest{
        Domains: domain,
        Bundle:  true,
    }

    logChan <- "Obtaining certificate"
    certificates, err := client.Certificate.Obtain(request)
    if err != nil {
        errChan <- errors.Wrap(err, "issue cert fail to obtain")
        return
    }
    name := strings.Join(domain, "_")
    saveDir := nginx.GetConfPath("ssl/" + name)
    if _, err = os.Stat(saveDir); os.IsNotExist(err) {
        err = os.MkdirAll(saveDir, 0755)
        if err != nil {
            errChan <- errors.Wrap(err, "issue cert fail to create")
            return
        }
    }

    // Each certificate comes back with the cert bytes, the bytes of the client's
    // private key, and a certificate URL. SAVE THESE TO DISK.
    logChan <- "Writing certificate to disk"
    err = os.WriteFile(filepath.Join(saveDir, "fullchain.cer"),
        certificates.Certificate, 0644)

    if err != nil {
        errChan <- errors.Wrap(err, "error issue cert write fullchain.cer")
        return
    }

    logChan <- "Writing certificate private key to disk"
    err = os.WriteFile(filepath.Join(saveDir, "private.key"),
        certificates.PrivateKey, 0644)

    if err != nil {
        errChan <- errors.Wrap(err, "error issue cert write key")
        return
    }

    close(errChan)
    logChan <- "Reloading nginx"

    nginx.Reload()

    logChan <- "Finished"
}