package main import ( "crypto/rand" "encoding/base32" "encoding/json" "errors" "fmt" "io/ioutil" "net" "os" "path/filepath" "sync" "github.com/cloudflare/cfssl/config" "github.com/cloudflare/cfssl/csr" "github.com/cloudflare/cfssl/helpers" "github.com/cloudflare/cfssl/initca" "github.com/cloudflare/cfssl/log" "github.com/cloudflare/cfssl/signer" "github.com/cloudflare/cfssl/signer/local" "k8s.io/apimachinery/pkg/util/validation" "k8s.io/apimachinery/pkg/util/validation/field" ) var ( secretData *SecretData ) type SecretData struct { l sync.Mutex clusters map[string]*ClusterSecrets changed bool config *config.Config } type ClusterSecrets struct { CAs map[string]*CA Tokens map[string]string } type CA struct { Key []byte Cert []byte Signed map[string]*KeyCert } type KeyCert struct { Key []byte Cert []byte ReqHash string } func secretDataPath() string { return filepath.Join(*dataDir, "secret-data.json") } func loadSecretData(config *config.Config) (err error) { log.Info("Loading secret data") sd := &SecretData{ clusters: make(map[string]*ClusterSecrets), changed: false, config: config, } ba, err := ioutil.ReadFile(secretDataPath()) if err != nil { if os.IsNotExist(err) { sd.changed = true err = nil secretData = sd return } return } if err = json.Unmarshal(ba, &sd.clusters); err != nil { return } secretData = sd return } func (sd *SecretData) Changed() bool { return sd.changed } func (sd *SecretData) Save() error { sd.l.Lock() defer sd.l.Unlock() log.Info("Saving secret data") ba, err := json.Marshal(sd.clusters) if err != nil { return err } return ioutil.WriteFile(secretDataPath(), ba, 0600) } func (sd *SecretData) cluster(name string) (cs *ClusterSecrets) { cs, ok := sd.clusters[name] if ok { return } sd.l.Lock() defer sd.l.Unlock() log.Info("secret-data: new cluster: ", name) cs = &ClusterSecrets{ CAs: make(map[string]*CA), Tokens: make(map[string]string), } sd.clusters[name] = cs sd.changed = true return } func (sd *SecretData) Token(cluster, name string) (token string, err error) { cs := sd.cluster(cluster) token = cs.Tokens[name] if token != "" { return } sd.l.Lock() defer sd.l.Unlock() log.Info("secret-data: new token in cluster ", cluster, ": ", name) b := make([]byte, 16) _, err = rand.Read(b) if err != nil { return } token = base32.StdEncoding.WithPadding(base32.NoPadding).EncodeToString(b) cs.Tokens[name] = token sd.changed = true return } func (sd *SecretData) CA(cluster, name string) (ca *CA, err error) { cs := sd.cluster(cluster) ca, ok := cs.CAs[name] if ok { return } sd.l.Lock() defer sd.l.Unlock() log.Info("secret-data: new CA in cluster ", cluster, ": ", name) req := &csr.CertificateRequest{ CN: "Direktil Local Server", KeyRequest: &csr.BasicKeyRequest{ A: "ecdsa", S: 521, // 256, 384, 521 }, Names: []csr.Name{ { C: "NC", O: "novit.nc", }, }, } cert, _, key, err := initca.New(req) if err != nil { return } ca = &CA{ Key: key, Cert: cert, Signed: make(map[string]*KeyCert), } cs.CAs[name] = ca sd.changed = true return } func (sd *SecretData) KeyCert(cluster, caName, name, profile, label string, req *csr.CertificateRequest) (kc *KeyCert, err error) { for idx, host := range req.Hosts { if ip := net.ParseIP(host); ip != nil { // valid IP (v4 or v6) continue } if host == "*" { continue } if errs := validation.IsDNS1123Subdomain(host); len(errs) == 0 { continue } if errs := validation.IsWildcardDNS1123Subdomain(host); len(errs) == 0 { continue } path := field.NewPath(cluster, name, "hosts").Index(idx) return nil, fmt.Errorf("%v: %q is not an IP or FQDN", path, host) } if req.CA != nil { err = errors.New("no CA section allowed here") return } ca, err := sd.CA(cluster, caName) if err != nil { return } rh := hash(req) kc, ok := ca.Signed[name] if ok && rh == kc.ReqHash { return } else if ok { log.Infof("secret-data: cluster %s: CA %s: CSR changed for %s: hash=%q previous=%q", cluster, caName, name, rh, kc.ReqHash) } else { log.Infof("secret-data: cluster %s: CA %s: new CSR for %s", cluster, caName, name) } sd.l.Lock() defer sd.l.Unlock() sgr, err := ca.Signer(sd.config.Signing) if err != nil { return } generator := &csr.Generator{Validator: func(_ *csr.CertificateRequest) error { return nil }} csr, key, err := generator.ProcessRequest(req) if err != nil { return } signReq := signer.SignRequest{ Request: string(csr), Profile: profile, Label: label, } cert, err := sgr.Sign(signReq) if err != nil { return } kc = &KeyCert{ Key: key, Cert: cert, ReqHash: rh, } ca.Signed[name] = kc sd.changed = true return } func (ca *CA) Signer(policy *config.Signing) (result *local.Signer, err error) { caCert, err := helpers.ParseCertificatePEM(ca.Cert) if err != nil { return } caKey, err := helpers.ParsePrivateKeyPEM(ca.Key) if err != nil { return } return local.NewSigner(caKey, caCert, signer.DefaultSigAlgo(caKey), policy) }