generate ssh secrets

Dockerfile

@@ -13,7 +13,7 @@ run apt-get update \
 run yes |apt-get install -y grub2 grub-pc-bin grub-efi-amd64-bin \
  && apt-get clean
 
-run apt-get install -y ca-certificates curl \
+run apt-get install -y ca-certificates curl openssh-client \
  && apt-get clean
 
 run curl -L https://github.com/vmware/govmomi/releases/download/v0.21.0/govc_linux_amd64.gz | gunzip > /bin/govc && chmod +x /bin/govc

cmd/dkl-dir2config/render-context.go

@@ -257,6 +257,11 @@ func (ctx *renderContext) templateFuncs(ctxMap map[string]interface{}) map[strin
 			return getKeyCert(name, "tls_dir")
 		},
 
+		"ssh_host_keys": func(dir string) (s string) {
+			return fmt.Sprintf("{{ ssh_host_keys %q %q %q}}",
+				dir, cluster, ctx.Host.Name)
+		},
+
 		"hosts_of_group": func() (hosts []interface{}) {
 			hosts = make([]interface{}, 0)
 

cmd/dkl-local-server/render-context.go

@@ -239,6 +239,33 @@ func (ctx *renderContext) templateFuncs() map[string]interface{} {
 				},
 			})
 		},
+
+		"ssh_host_keys": func(dir, cluster, host string) (s string, err error) {
+			pairs, err := secretData.SSHKeyPairs(cluster, host)
+			if err != nil {
+				return
+			}
+
+			files := make([]config.FileDef, 0, len(pairs)*2)
+
+			for _, pair := range pairs {
+				basePath := path.Join(dir, "ssh_host_"+pair.Type+"_key")
+				files = append(files, []config.FileDef{
+					{
+						Path:    basePath,
+						Mode:    0600,
+						Content: pair.Private,
+					},
+					{
+						Path:    basePath + ".pub",
+						Mode:    0644,
+						Content: pair.Public,
+					},
+				}...)
+			}
+
+			return asYaml(files)
+		},
 	}
 }
 

cmd/dkl-local-server/secrets.go

@@ -26,6 +26,7 @@ import (
 
 var (
 	secretData *SecretData
+	DontSave   = false
 )
 
 type SecretData struct {
@@ -40,6 +41,7 @@ type ClusterSecrets struct {
 	CAs         map[string]*CA
 	Tokens      map[string]string
 	Passwords   map[string]string
+	SSHKeyPairs map[string][]SSHKeyPair
 }
 
 type CA struct {
@@ -92,6 +94,10 @@ func (sd *SecretData) Changed() bool {
 }
 
 func (sd *SecretData) Save() error {
+	if DontSave {
+		return nil
+	}
+
 	sd.l.Lock()
 	defer sd.l.Unlock()
 

cmd/dkl-local-server/ssh-secrets.go

@@ -0,0 +1,167 @@
+package main
+
+import (
+	"crypto/dsa"
+	"crypto/ecdsa"
+	"crypto/ed25519"
+	"crypto/elliptic"
+	"crypto/rand"
+	"crypto/rsa"
+	"crypto/x509"
+	"encoding/asn1"
+	"fmt"
+	"io/ioutil"
+	"os"
+	"os/exec"
+)
+
+type SSHKeyPair struct {
+	Type    string
+	Public  string
+	Private string
+}
+
+func (sd *SecretData) SSHKeyPairs(cluster, host string) (pairs []SSHKeyPair, err error) {
+	cs := sd.cluster(cluster)
+
+	if cs.SSHKeyPairs == nil {
+		cs.SSHKeyPairs = map[string][]SSHKeyPair{}
+	}
+
+	outFile, err := ioutil.TempFile("/tmp", "dls-key.")
+	if err != nil {
+		return
+	}
+
+	outPath := outFile.Name()
+
+	removeTemp := func() {
+		os.Remove(outPath)
+		os.Remove(outPath + ".pub")
+	}
+
+	defer removeTemp()
+
+	pairs = cs.SSHKeyPairs[host]
+
+	didGenerate := false
+
+genLoop:
+	for _, keyType := range []string{
+		"rsa",
+		"dsa",
+		"ecdsa",
+		"ed25519",
+	} {
+		for _, pair := range pairs {
+			if pair.Type == keyType {
+				continue genLoop
+			}
+		}
+
+		didGenerate = true
+
+		removeTemp()
+
+		var out, privKey, pubKey []byte
+
+		out, err = exec.Command("ssh-keygen",
+			"-N", "",
+			"-C", "root@"+host,
+			"-f", outPath,
+			"-t", keyType).CombinedOutput()
+		if err != nil {
+			err = fmt.Errorf("ssh-keygen failed: %v: %s", err, string(out))
+			return
+		}
+
+		privKey, err = ioutil.ReadFile(outPath)
+		if err != nil {
+			return
+		}
+
+		os.Remove(outPath)
+
+		pubKey, err = ioutil.ReadFile(outPath + ".pub")
+		if err != nil {
+			return
+		}
+
+		os.Remove(outPath + ".pub")
+
+		pairs = append(pairs, SSHKeyPair{
+			Type:    keyType,
+			Public:  string(pubKey),
+			Private: string(privKey),
+		})
+	}
+
+	if didGenerate {
+		cs.SSHKeyPairs[host] = pairs
+		err = sd.Save()
+	}
+
+	return
+}
+
+func sshKeyGenDSA() (data []byte, pubKey interface{}, err error) {
+	privKey := &dsa.PrivateKey{}
+
+	err = dsa.GenerateParameters(&privKey.Parameters, rand.Reader, dsa.L1024N160)
+	if err != nil {
+		return
+	}
+
+	err = dsa.GenerateKey(privKey, rand.Reader)
+	if err != nil {
+		return
+	}
+
+	data, err = asn1.Marshal(*privKey)
+	//data, err = x509.MarshalPKCS8PrivateKey(privKey)
+	if err != nil {
+		return
+	}
+
+	pubKey = privKey.PublicKey
+	return
+}
+
+func sshKeyGenRSA() (data []byte, pubKey interface{}, err error) {
+	privKey, err := rsa.GenerateKey(rand.Reader, 2048)
+	if err != nil {
+		return
+	}
+
+	data = x509.MarshalPKCS1PrivateKey(privKey)
+	pubKey = privKey.Public()
+
+	return
+}
+
+func sshKeyGenECDSA() (data []byte, pubKey interface{}, err error) {
+	privKey, err := ecdsa.GenerateKey(elliptic.P521(), rand.Reader)
+	if err != nil {
+		return
+	}
+
+	data, err = x509.MarshalPKCS8PrivateKey(privKey)
+	if err != nil {
+		return
+	}
+
+	pubKey = privKey.Public()
+
+	return
+}
+
+func sshKeyGenED25519() (data []byte, pubKey interface{}, err error) {
+	pubKey, privKey, err := ed25519.GenerateKey(rand.Reader)
+
+	data, err = x509.MarshalPKCS8PrivateKey(privKey)
+	if err != nil {
+		return
+	}
+
+	return
+}

cmd/dkl-local-server/ssh-secrets_test.go

@@ -0,0 +1,17 @@
+package main
+
+import "testing"
+
+func init() {
+	DontSave = true
+}
+
+func TestSSHKeyGet(t *testing.T) {
+	sd := &SecretData{
+		clusters: make(map[string]*ClusterSecrets),
+	}
+
+	if _, err := sd.SSHKeyPairs("test", "host"); err != nil {
+		t.Error(err)
+	}
+}

go.mod

@@ -1,6 +1,7 @@
 module novit.nc/direktil/local-server
 
 require (
+	github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412
 	github.com/cavaliercoder/go-cpio v0.0.0-20180626203310-925f9528c45e
 	github.com/cloudflare/cfssl v0.0.0-20181213083726-b94e044bb51e
 	github.com/emicklei/go-restful v2.10.0+incompatible
@@ -14,7 +15,7 @@ require (
 	github.com/mcluseau/go-swagger-ui v0.0.0-20191019002626-fd9128c24a34
 	github.com/oklog/ulid v1.3.1
 	github.com/pierrec/lz4 v2.3.0+incompatible
-	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550 // indirect
+	golang.org/x/crypto v0.0.0-20191011191535-87dc89f01550
 	golang.org/x/net v0.0.0-20191014212845-da9a3fd4c582 // indirect
 	golang.org/x/sys v0.0.0-20191018095205-727590c5006e // indirect
 	gopkg.in/src-d/go-billy.v4 v4.3.2

go.sum

@@ -8,6 +8,8 @@ github.com/PuerkitoBio/purell v1.1.1/go.mod h1:c11w/QuzBsJSee3cPx9rAFu61PvFxuPbt
 github.com/PuerkitoBio/urlesc v0.0.0-20160726150825-5bd2802263f2/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578 h1:d+Bc7a5rLufV/sSk/8dngufqelfh6jnri85riMAaF/M=
 github.com/PuerkitoBio/urlesc v0.0.0-20170810143723-de5bf2ad4578/go.mod h1:uGdkoq3SwY9Y+13GIhn11/XLaGBb4BfwItxLd5jeuXE=
+github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412 h1:w1UutsfOrms1J05zt7ISrnJIXKzwaspym5BTKGx93EI=
+github.com/agl/ed25519 v0.0.0-20170116200512-5312a6153412/go.mod h1:WPjqKcmVOxf0XSf3YxCJs6N6AOSrOx3obionmG7T0y0=
 github.com/alcortesm/tgz v0.0.0-20161220082320-9c5fe88206d7 h1:uSoVVbwJiQipAclBbw+8quDsfcvFjOpI5iCf4p/cqCs=
 github.com/alcortesm/tgz v0.0.0-20161220082320-9c5fe88206d7/go.mod h1:6zEj6s6u/ghQa61ZWa/C2Aw3RkjiTBOix7dkqa1VLIs=
 github.com/anmitsu/go-shlex v0.0.0-20161002113705-648efa622239 h1:kFOfPq6dUM1hTo4JG6LR5AXSUEsOjtdm0kw0FtQtMJA=