first iteration to automate certificate generation

2023-02-26 11:02:30 +01:00
parent e25db3094f
commit d6bc349e73
12 changed files with 291 additions and 5 deletions
--- a/certs/account.go
+++ b/certs/account.go
@@ -0,0 +1,114 @@
+package certs
+
+import (
+	"crypto"
+	"crypto/ecdsa"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/x509"
+	"encoding/json"
+	"encoding/pem"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/go-acme/lego/v4/lego"
+	"github.com/go-acme/lego/v4/registration"
+)
+
+type Account struct {
+	Email        string
+	Registration *registration.Resource
+	key          *ecdsa.PrivateKey
+}
+
+func (u *Account) GetEmail() string {
+	return u.Email
+}
+func (u *Account) GetRegistration() *registration.Resource {
+	return u.Registration
+}
+func (u *Account) GetPrivateKey() crypto.PrivateKey {
+	return u.key
+}
+
+func LoadAccount() *Account {
+	jsonBytes, err := os.ReadFile(accountFilePath)
+	if err != nil {
+		if strings.Contains(err.Error(), "no such file or directory") {
+			RegisterAccount()
+			return LoadAccount()
+		}
+		log.Fatal(err)
+	}
+	account := &Account{}
+	err = json.Unmarshal(jsonBytes, account)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	privKey, err := os.ReadFile(keyFilePath)
+	if err != nil {
+		log.Fatal(err)
+	}
+	privateKey := decode(string(privKey))
+
+	account.key = privateKey
+	return account
+}
+
+func RegisterAccount() {
+	privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	account := &Account{
+		Email: email,
+		key:   privateKey,
+	}
+	config := lego.NewConfig(account)
+	config.CADirURL = caDirUrl
+	legoClient, err := lego.NewClient(config)
+
+	reg, err := legoClient.Registration.Register(registration.RegisterOptions{TermsOfServiceAgreed: true})
+	if reg.Body.Status != "valid" {
+		log.Fatalf("registration failed with status %s", reg.Body.Status)
+	}
+	log.Println(reg.Body.TermsOfServiceAgreed)
+	account.Registration = reg
+
+	os.MkdirAll(filepath.Dir(keyFilePath), os.ModePerm)
+	privKey := encode(privateKey)
+	err = os.WriteFile(keyFilePath, []byte(privKey), 0o644)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	jsonBytes, err := json.MarshalIndent(account, "", "\t")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	os.MkdirAll(filepath.Dir(accountFilePath), os.ModePerm)
+	err = os.WriteFile(accountFilePath, jsonBytes, 0o600)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
+
+func encode(privateKey *ecdsa.PrivateKey) string {
+	x509Encoded, _ := x509.MarshalECPrivateKey(privateKey)
+	pemEncoded := pem.EncodeToMemory(&pem.Block{Type: "PRIVATE KEY", Bytes: x509Encoded})
+
+	return string(pemEncoded)
+}
+
+func decode(pemEncoded string) *ecdsa.PrivateKey {
+	block, _ := pem.Decode([]byte(pemEncoded))
+	x509Encoded := block.Bytes
+	privateKey, _ := x509.ParseECPrivateKey(x509Encoded)
+
+	return privateKey
+}