365 lines
9.8 KiB
Go
365 lines
9.8 KiB
Go
package main
|
|
|
|
import (
|
|
"bytes"
|
|
"crypto"
|
|
"crypto/ecdsa"
|
|
"crypto/elliptic"
|
|
"crypto/rand"
|
|
"crypto/rsa"
|
|
"crypto/tls"
|
|
"crypto/x509"
|
|
"crypto/x509/pkix"
|
|
"encoding/pem"
|
|
"errors"
|
|
"github.com/OrlovEvgeny/go-mcache"
|
|
"github.com/akrylysov/pogreb/fs"
|
|
"github.com/go-acme/lego/v4/certificate"
|
|
"github.com/go-acme/lego/v4/challenge"
|
|
"github.com/go-acme/lego/v4/challenge/tlsalpn01"
|
|
"github.com/go-acme/lego/v4/providers/dns"
|
|
"log"
|
|
"math/big"
|
|
"os"
|
|
"strings"
|
|
"time"
|
|
|
|
"github.com/akrylysov/pogreb"
|
|
|
|
"github.com/go-acme/lego/v4/certcrypto"
|
|
"github.com/go-acme/lego/v4/lego"
|
|
"github.com/go-acme/lego/v4/registration"
|
|
)
|
|
|
|
// tlsConfig contains the configuration for generating, serving and cleaning up Let's Encrypt certificates.
|
|
var tlsConfig = &tls.Config{
|
|
// check DNS name & get certificate from Let's Encrypt
|
|
GetCertificate: func(info *tls.ClientHelloInfo) (*tls.Certificate, error) {
|
|
if os.Getenv("ACME_ACCEPT_TERMS") != "true" {
|
|
return FallbackCertificate(), nil
|
|
}
|
|
|
|
sni := strings.ToLower(strings.TrimSpace(info.ServerName))
|
|
sniBytes := []byte(sni)
|
|
if len(sni) < 1 {
|
|
return nil, errors.New("missing sni")
|
|
}
|
|
|
|
if info.SupportedProtos != nil {
|
|
for _, proto := range info.SupportedProtos {
|
|
if proto == tlsalpn01.ACMETLS1Protocol {
|
|
challenge, ok := challengeCache.Get(sni)
|
|
if !ok {
|
|
return nil, errors.New("no challenge for this domain")
|
|
}
|
|
cert, err := tlsalpn01.ChallengeCert(sni, challenge.(string))
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
return cert, nil
|
|
}
|
|
}
|
|
}
|
|
|
|
targetOwner := ""
|
|
if bytes.HasSuffix(sniBytes, MainDomainSuffix) {
|
|
// deliver default certificate for the main domain (*.codeberg.page)
|
|
sniBytes = MainDomainSuffix
|
|
sni = string(sniBytes)
|
|
} else {
|
|
var targetRepo, targetBranch string
|
|
targetOwner, targetRepo, targetBranch = getTargetFromDNS(sni)
|
|
if targetOwner == "" {
|
|
// DNS not set up, return a self-signed certificate to redirect to the docs
|
|
return FallbackCertificate(), nil
|
|
}
|
|
|
|
// TODO: use .domains file to list all domains, to keep users from getting rate-limited
|
|
_, _ = targetRepo, targetBranch
|
|
/*canonicalDomain := checkCanonicalDomain(targetOwner, targetRepo, targetBranch)
|
|
if sni != canonicalDomain {
|
|
return FallbackCertificate(), nil
|
|
}*/
|
|
}
|
|
|
|
// limit users to 1 certificate per week
|
|
|
|
var cert, key []byte
|
|
if tlsCertificate, ok := keyCache.Get(sni); ok {
|
|
// we can use an existing certificate object
|
|
return tlsCertificate.(*tls.Certificate), nil
|
|
} else if ok, err := keyDatabase.Has(sniBytes); err != nil {
|
|
// key database is not working
|
|
panic(err)
|
|
} else if ok {
|
|
// parse certificate from database
|
|
|
|
cert, err = keyDatabase.Get(sniBytes)
|
|
if err != nil {
|
|
// key database is not working
|
|
panic(err)
|
|
}
|
|
key, err = keyDatabase.Get(append(sniBytes, '/', 'k', 'e', 'y'))
|
|
if err != nil {
|
|
// key database is not working or key doesn't exist
|
|
panic(err)
|
|
}
|
|
} else {
|
|
// request a new certificate
|
|
|
|
// TODO: rate-limit certificates per owner
|
|
// LE Rate Limits:
|
|
// - 300 new orders per account per 3 hours
|
|
// - 20 requests per second
|
|
// - 10 Accounts per IP per 3 hours
|
|
|
|
if bytes.Equal(sniBytes, MainDomainSuffix) {
|
|
return nil, errors.New("won't request certificate for main domain, something really bad has happened")
|
|
}
|
|
|
|
log.Printf("Requesting new certificate for %s", sni)
|
|
privateKey, err := rsa.GenerateKey(rand.Reader, 2048)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
key = x509.MarshalPKCS1PrivateKey(privateKey)
|
|
res, err := acmeClient.Certificate.Obtain(certificate.ObtainRequest{
|
|
Domains: []string{sni},
|
|
PrivateKey: key,
|
|
Bundle: true,
|
|
MustStaple: true,
|
|
})
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
log.Printf("Obtained certificate for %s", sni)
|
|
err = keyDatabase.Put(append(sniBytes, '/', 'k', 'e', 'y'), key)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
err = keyDatabase.Put(sniBytes, res.Certificate)
|
|
if err != nil {
|
|
_ = keyDatabase.Delete(append(sniBytes, '/', 'k', 'e', 'y'))
|
|
return nil, err
|
|
}
|
|
cert = res.Certificate
|
|
}
|
|
tlsCertificate, err := tls.X509KeyPair(pem.EncodeToMemory(&pem.Block{
|
|
Bytes: cert,
|
|
Type: "CERTIFICATE",
|
|
}), pem.EncodeToMemory(&pem.Block{
|
|
Bytes: key,
|
|
Type: "RSA PRIVATE KEY",
|
|
}))
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
err = keyCache.Set(sni, &tlsCertificate, 15 * time.Minute)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
return &tlsCertificate, nil
|
|
},
|
|
PreferServerCipherSuites: true,
|
|
NextProtos: []string{
|
|
tlsalpn01.ACMETLS1Protocol,
|
|
},
|
|
|
|
// generated 2021-07-13, Mozilla Guideline v5.6, Go 1.14.4, intermediate configuration
|
|
// https://ssl-config.mozilla.org/#server=go&version=1.14.4&config=intermediate&guideline=5.6
|
|
MinVersion: tls.VersionTLS12,
|
|
CipherSuites: []uint16{
|
|
tls.TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256,
|
|
tls.TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256,
|
|
tls.TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384,
|
|
tls.TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384,
|
|
tls.TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305,
|
|
tls.TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305,
|
|
},
|
|
}
|
|
|
|
// GetHSTSHeader returns a HSTS header with includeSubdomains & preload for MainDomainSuffix and RawDomain, or an empty
|
|
// string for custom domains.
|
|
func GetHSTSHeader(host []byte) string {
|
|
if bytes.HasSuffix(host, MainDomainSuffix) || bytes.Equal(host, RawDomain) {
|
|
return "max-age=63072000; includeSubdomains; preload"
|
|
} else {
|
|
return ""
|
|
}
|
|
}
|
|
|
|
var challengeCache = mcache.New()
|
|
var keyCache = mcache.New()
|
|
var keyDatabase *pogreb.DB
|
|
|
|
var fallbackCertificate *tls.Certificate
|
|
// FallbackCertificate generates a new self-signed TLS certificate on demand.
|
|
func FallbackCertificate() *tls.Certificate {
|
|
if fallbackCertificate != nil {
|
|
return fallbackCertificate
|
|
}
|
|
|
|
fallbackSerial, err := rand.Int(rand.Reader, (&big.Int{}).Lsh(big.NewInt(1), 159))
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
fallbackCertKey, err := rsa.GenerateKey(rand.Reader, 1024)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
fallbackCertSpecification := &x509.Certificate{
|
|
Subject: pkix.Name{
|
|
CommonName: strings.TrimPrefix(string(MainDomainSuffix), "."),
|
|
},
|
|
SerialNumber: fallbackSerial,
|
|
NotBefore: time.Now(),
|
|
NotAfter: time.Now().AddDate(100, 0, 0),
|
|
}
|
|
|
|
fallbackCertBytes, err := x509.CreateCertificate(
|
|
rand.Reader,
|
|
fallbackCertSpecification,
|
|
fallbackCertSpecification,
|
|
fallbackCertKey.Public(),
|
|
fallbackCertKey,
|
|
)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
fallbackCert, err := tls.X509KeyPair(pem.EncodeToMemory(&pem.Block{
|
|
Bytes: fallbackCertBytes,
|
|
Type: "CERTIFICATE",
|
|
}), pem.EncodeToMemory(&pem.Block{
|
|
Bytes: x509.MarshalPKCS1PrivateKey(fallbackCertKey),
|
|
Type: "RSA PRIVATE KEY",
|
|
}))
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
fallbackCertificate = &fallbackCert
|
|
return fallbackCertificate
|
|
}
|
|
|
|
type AcmeAccount struct {
|
|
Email string
|
|
Registration *registration.Resource
|
|
key crypto.PrivateKey
|
|
}
|
|
func (u *AcmeAccount) GetEmail() string {
|
|
return u.Email
|
|
}
|
|
func (u AcmeAccount) GetRegistration() *registration.Resource {
|
|
return u.Registration
|
|
}
|
|
func (u *AcmeAccount) GetPrivateKey() crypto.PrivateKey {
|
|
return u.key
|
|
}
|
|
var acmeClient *lego.Client
|
|
|
|
type AcmeTLSChallengeProvider struct{}
|
|
var _ challenge.Provider = AcmeTLSChallengeProvider{}
|
|
func (a AcmeTLSChallengeProvider) Present(domain, _, keyAuth string) error {
|
|
return challengeCache.Set(domain, keyAuth, 1*time.Hour)
|
|
}
|
|
func (a AcmeTLSChallengeProvider) CleanUp(domain, _, _ string) error {
|
|
challengeCache.Remove(domain)
|
|
return nil
|
|
}
|
|
|
|
func init() {
|
|
FallbackCertificate()
|
|
|
|
var err error
|
|
keyDatabase, err = pogreb.Open("key-database.pogreb", &pogreb.Options{
|
|
BackgroundSyncInterval: 30 * time.Second,
|
|
BackgroundCompactionInterval: 6 * time.Hour,
|
|
FileSystem: fs.OSMMap,
|
|
})
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
privateKey, err := ecdsa.GenerateKey(elliptic.P256(), rand.Reader)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
myUser := AcmeAccount{
|
|
Email: "",
|
|
key: privateKey,
|
|
}
|
|
config := lego.NewConfig(&myUser)
|
|
config.CADirURL = envOr("ACME_API", "https://acme-v02.api.letsencrypt.org/directory")
|
|
config.Certificate.KeyType = certcrypto.RSA2048
|
|
acmeClient, err = lego.NewClient(config)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
err = acmeClient.Challenge.SetTLSALPN01Provider(AcmeTLSChallengeProvider{})
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
|
|
// accept terms
|
|
if os.Getenv("ACME_ACCEPT_TERMS") == "true" {
|
|
reg, err := acmeClient.Registration.Register(registration.RegisterOptions{TermsOfServiceAgreed: os.Getenv("ACME_ACCEPT_TERMS") == "true"})
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
myUser.Registration = reg
|
|
} else {
|
|
log.Printf("Warning: not using ACME certificates as ACME_ACCEPT_TERMS is false!")
|
|
}
|
|
|
|
// generate certificate for main domain
|
|
if os.Getenv("ACME_ACCEPT_TERMS") != "true" || os.Getenv("DNS_PROVIDER") == "" {
|
|
err = keyCache.Set(string(MainDomainSuffix), FallbackCertificate(), mcache.TTL_FOREVER)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
} else {
|
|
log.Printf("Requesting new certificate for *%s", MainDomainSuffix)
|
|
dnsAcmeClient, err := lego.NewClient(config)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
provider, err := dns.NewDNSChallengeProviderByName(os.Getenv("DNS_PROVIDER"))
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
err = dnsAcmeClient.Challenge.SetDNS01Provider(provider)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
mainPrivateKey, err := rsa.GenerateKey(rand.Reader, 2048)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
mainKey := x509.MarshalPKCS1PrivateKey(mainPrivateKey)
|
|
res, err := acmeClient.Certificate.Obtain(certificate.ObtainRequest{
|
|
Domains: []string{"*" + string(MainDomainSuffix), string(MainDomainSuffix[1:])},
|
|
PrivateKey: mainKey,
|
|
Bundle: true,
|
|
MustStaple: true,
|
|
})
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
err = keyDatabase.Put(append(MainDomainSuffix, '/', 'k', 'e', 'y'), mainKey)
|
|
if err != nil {
|
|
panic(err)
|
|
}
|
|
err = keyDatabase.Put(MainDomainSuffix, res.Certificate)
|
|
if err != nil {
|
|
_ = keyDatabase.Delete(append(MainDomainSuffix, '/', 'k', 'e', 'y'))
|
|
panic(err)
|
|
}
|
|
}
|
|
}
|
|
|
|
// TODO: renew & revoke
|