106 lines
2.3 KiB
Go
106 lines
2.3 KiB
Go
package ssh
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import (
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"bytes"
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"crypto/rand"
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"crypto/rsa"
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"crypto/x509"
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"encoding/pem"
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"io/ioutil"
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"os"
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"path/filepath"
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"testing"
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"golang.org/x/crypto/ssh"
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)
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// verify that we can locate public key data
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func TestFindKeyData(t *testing.T) {
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// set up a test directory
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td, err := ioutil.TempDir("", "ssh")
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if err != nil {
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t.Fatal(err)
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}
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defer os.RemoveAll(td)
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cwd, err := os.Getwd()
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if err != nil {
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t.Fatal(err)
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}
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if err := os.Chdir(td); err != nil {
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t.Fatal(err)
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}
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defer os.Chdir(cwd)
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id := "provisioner_id"
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pub := generateSSHKey(t, id)
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pubData := pub.Marshal()
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// backup the pub file, and replace it with a broken file to ensure we
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// extract the public key from the private key.
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if err := os.Rename(id+".pub", "saved.pub"); err != nil {
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t.Fatal(err)
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}
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if err := ioutil.WriteFile(id+".pub", []byte("not a public key"), 0600); err != nil {
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t.Fatal(err)
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}
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foundData := findIDPublicKey(id)
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if !bytes.Equal(foundData, pubData) {
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t.Fatalf("public key %q does not match", foundData)
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}
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// move the pub file back, and break the private key file to simulate an
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// encrypted private key
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if err := os.Rename("saved.pub", id+".pub"); err != nil {
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t.Fatal(err)
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}
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if err := ioutil.WriteFile(id, []byte("encrypted private key"), 0600); err != nil {
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t.Fatal(err)
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}
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foundData = findIDPublicKey(id)
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if !bytes.Equal(foundData, pubData) {
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t.Fatalf("public key %q does not match", foundData)
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}
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// check the file by path too
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foundData = findIDPublicKey(filepath.Join(".", id))
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if !bytes.Equal(foundData, pubData) {
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t.Fatalf("public key %q does not match", foundData)
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}
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}
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func generateSSHKey(t *testing.T, idFile string) ssh.PublicKey {
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t.Helper()
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priv, err := rsa.GenerateKey(rand.Reader, 2048)
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if err != nil {
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t.Fatal(err)
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}
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privFile, err := os.OpenFile(idFile, os.O_RDWR|os.O_CREATE, 0600)
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if err != nil {
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t.Fatal(err)
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}
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defer privFile.Close()
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privPEM := &pem.Block{Type: "RSA PRIVATE KEY", Bytes: x509.MarshalPKCS1PrivateKey(priv)}
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if err := pem.Encode(privFile, privPEM); err != nil {
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t.Fatal(err)
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}
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// generate and write public key
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pub, err := ssh.NewPublicKey(&priv.PublicKey)
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if err != nil {
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t.Fatal(err)
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}
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err = ioutil.WriteFile(idFile+".pub", ssh.MarshalAuthorizedKey(pub), 0600)
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if err != nil {
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t.Fatal(err)
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}
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return pub
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}
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