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| Original file line number | Diff line number | Diff line change |
|---|---|---|
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@@ -42,3 +42,4 @@ changelog: | |
| exclude: | ||
| - "^docs:" | ||
| - "^test:" | ||
| - "^chore:" | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,151 @@ | ||
| package utils | ||
|
|
||
| import ( | ||
| "errors" | ||
| "fmt" | ||
| "log" | ||
| "net" | ||
| "os" | ||
| "os/exec" | ||
| "os/user" | ||
| "path" | ||
| "strings" | ||
| "time" | ||
|
|
||
| "github.com/mightymoud/sidekick/render" | ||
| "github.com/skeema/knownhosts" | ||
| "golang.org/x/crypto/ssh" | ||
| "golang.org/x/crypto/ssh/agent" | ||
| ) | ||
|
|
||
| func getKeyFilesAuth() ([]ssh.AuthMethod, error) { | ||
| user, err := user.Current() | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| sshDir := path.Join(user.HomeDir, ".ssh") | ||
| keyFiles := []string{ | ||
| "id_rsa", | ||
| "id_ecdsa", | ||
| "id_ed25519", | ||
| } | ||
|
|
||
| var authMethods []ssh.AuthMethod | ||
|
|
||
| for _, keyFile := range keyFiles { | ||
| keyPath := path.Join(sshDir, keyFile) | ||
| if _, err := os.Stat(keyPath); os.IsNotExist(err) { | ||
| continue | ||
| } | ||
|
|
||
| privateKey, err := os.ReadFile(keyPath) | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
|
||
| signer, err := ssh.ParsePrivateKey(privateKey) | ||
| if err != nil { | ||
| continue | ||
| } | ||
|
|
||
| authMethods = append(authMethods, ssh.PublicKeys(signer)) | ||
| } | ||
|
|
||
| return authMethods, nil | ||
| } | ||
|
|
||
| func inspectServerPublicKey(key ssh.PublicKey, hostname string) { | ||
| sshKeyCmd := exec.Command("sh", "-s", "-", string(ssh.MarshalAuthorizedKey(key))) | ||
| sshKeyCmd.Stdin = strings.NewReader(sshKeyScript) | ||
| result, sshKeyCmdErr := sshKeyCmd.Output() | ||
| if sshKeyCmdErr != nil { | ||
| panic(sshKeyCmdErr) | ||
| } | ||
| resultLines := strings.Split(string(result), "\n") | ||
| keyHash := resultLines[0] | ||
|
|
||
| render.RenderKeyValidation(resultLines, keyHash, hostname) | ||
|
|
||
| } | ||
|
|
||
| func GetSshClient(server string, sshUser string) (*ssh.Client, error) { | ||
| sshPort := "22" | ||
| sshAgentSock := os.Getenv("SSH_AUTH_SOCK") | ||
| if sshAgentSock == "" { | ||
| log.Fatal("No SSH SOCK AVAILABLE") | ||
| return nil, errors.New("Error happened connecting to ssh-agent") | ||
| } | ||
|
|
||
| conn, err := net.Dial("unix", sshAgentSock) | ||
| if err != nil { | ||
| log.Fatalf("Failed to connect to SSH agent: %s", err) | ||
| return nil, err | ||
| } | ||
| defer conn.Close() | ||
|
|
||
| agentClient := agent.NewClient(conn) | ||
|
|
||
| // Get auth of standard keys not in agent | ||
| authMethods, _ := getKeyFilesAuth() | ||
|
|
||
| authMethods = append(authMethods, ssh.PublicKeysCallback(agentClient.Signers)) | ||
|
|
||
| cb := ssh.HostKeyCallback(func(hostname string, remote net.Addr, key ssh.PublicKey) error { | ||
| currentUser, _ := user.Current() | ||
| khPath := fmt.Sprintf("%s/.ssh/known_hosts", currentUser.HomeDir) | ||
| kh, knErr := knownhosts.NewDB(khPath) | ||
| if knErr != nil { | ||
| log.Fatalf("Failed to read known_hosts: %s", err) | ||
| os.Exit(1) | ||
| } | ||
|
|
||
| innerCallback := kh.HostKeyCallback() | ||
| err := innerCallback(hostname, remote, key) | ||
| if knownhosts.IsHostKeyChanged(err) { | ||
| return fmt.Errorf("REMOTE HOST IDENTIFICATION HAS CHANGED for host %s! This may indicate a MitM attack.", hostname) | ||
| } else if knownhosts.IsHostUnknown(err) { | ||
| inspectServerPublicKey(key, hostname) | ||
| f, ferr := os.OpenFile(khPath, os.O_APPEND|os.O_WRONLY, 0600) | ||
| if ferr == nil { | ||
| defer f.Close() | ||
| ferr = knownhosts.WriteKnownHost(f, hostname, remote, key) | ||
| } else { | ||
| log.Printf("Failed to add host %s to known_hosts: %v\n", hostname, ferr) | ||
| } | ||
| return nil | ||
| } | ||
| return err | ||
| }) | ||
|
|
||
| var client *ssh.Client | ||
|
|
||
| // This error will be thrown when one method/key doesn't work | ||
| var expectedClientErr = errors.New("ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey], no supported methods remain") | ||
| for _, method := range authMethods { | ||
| config := &ssh.ClientConfig{ | ||
| User: sshUser, | ||
| Auth: []ssh.AuthMethod{method}, | ||
| HostKeyCallback: cb, | ||
| Timeout: 5 * time.Second, | ||
| } | ||
|
|
||
| workingClient, sshClientErr := ssh.Dial("tcp", fmt.Sprintf("%s:%s", server, sshPort), config) | ||
| if sshClientErr != nil { | ||
| if sshClientErr.Error() != expectedClientErr.Error() { | ||
| log.Fatalf("Failed to create ssh client to the server: %v", sshClientErr) | ||
| } | ||
| continue | ||
| } | ||
| client = workingClient | ||
| break | ||
| } | ||
| return client, nil | ||
| } | ||
|
|
||
| func Login(server string, user string) (*ssh.Client, error) { | ||
| sshClient, err := GetSshClient(server, user) | ||
| if err != nil { | ||
| return nil, err | ||
| } | ||
| return sshClient, nil | ||
| } |
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