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@ -1,8 +1,10 @@
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package backy
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import (
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"bufio"
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"errors"
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"fmt"
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"log"
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"os"
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"os/user"
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"path/filepath"
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@ -90,6 +92,8 @@ func (remoteConfig *Host) ConnectToSSHHost() (*ssh.Client, error) {
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println("HostName: " + remoteConfig.HostName[0])
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}
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}
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hostKey := getHostKey(remoteConfig.Host)
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privateKey, err := os.ReadFile(remoteConfig.PrivateKeyPath)
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if err != nil {
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return nil, fmt.Errorf("read private key error: %w", err)
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@ -101,12 +105,13 @@ func (remoteConfig *Host) ConnectToSSHHost() (*ssh.Client, error) {
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sshConfig := &ssh.ClientConfig{
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User: remoteConfig.User,
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Auth: []ssh.AuthMethod{ssh.PublicKeys(signer)},
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HostKeyCallback: ssh.InsecureIgnoreHostKey(),
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HostKeyCallback: ssh.FixedHostKey(hostKey),
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}
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for _, host := range remoteConfig.HostName {
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sshClient, connectErr = ssh.Dial("tcp", host, sshConfig)
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if connectErr != nil {
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panic(fmt.Errorf("error when connecting to host %s: %w", host, connectErr))
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continue
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// panic(fmt.Errorf("error when connecting to host %s: %w", host, connectErr))
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}
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}
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break
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@ -115,3 +120,36 @@ func (remoteConfig *Host) ConnectToSSHHost() (*ssh.Client, error) {
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}
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return sshClient, connectErr
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}
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func getHostKey(host string) ssh.PublicKey {
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// parse OpenSSH known_hosts file
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// ssh or use ssh-keyscan to get initial key
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file, err := os.Open(filepath.Join(os.Getenv("HOME"), ".ssh", "known_hosts"))
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if err != nil {
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panic(err)
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}
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defer file.Close()
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scanner := bufio.NewScanner(file)
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var hostKey ssh.PublicKey
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for scanner.Scan() {
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fields := strings.Split(scanner.Text(), " ")
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if len(fields) != 3 {
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continue
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}
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if strings.Contains(fields[0], host) {
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var err error
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hostKey, _, _, _, err = ssh.ParseAuthorizedKey(scanner.Bytes())
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if err != nil {
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log.Fatalf("error parsing %q: %v", fields[2], err)
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}
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break
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}
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}
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if hostKey == nil {
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log.Fatalf("no hostkey found for %s", host)
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}
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return hostKey
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}
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