Merge pull request #4598 from mitchellh/replace4035
Use SSH agent when enabled for bastion step
This commit is contained in:
Matthew Hooker
GitHub
commit
5c3db7614f
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|
@ -12,6 +12,7 @@ import (
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commonssh "github.com/mitchellh/packer/common/ssh"
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"github.com/mitchellh/packer/communicator/ssh"
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"github.com/mitchellh/packer/packer"
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"github.com/xanzy/ssh-agent"
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gossh "golang.org/x/crypto/ssh"
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)
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@ -94,6 +95,7 @@ func (s *StepConnectSSH) waitForSSH(state multistep.StateBag, cancel <-chan stru
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conf, err := sshBastionConfig(s.Config)
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if err != nil {
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log.Printf("[ERROR] Error calling sshBastionConfig: %v", err)
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return nil, fmt.Errorf("Error configuring bastion: %s", err)
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}
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bConf = conf
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@ -196,7 +198,15 @@ func (s *StepConnectSSH) waitForSSH(state multistep.StateBag, cancel <-chan stru
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}
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func sshBastionConfig(config *Config) (*gossh.ClientConfig, error) {
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auth := make([]gossh.AuthMethod, 0, 2)
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var auth []gossh.AuthMethod
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if !config.SSHDisableAgent {
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log.Printf("[INFO] SSH agent forwarding enabled.")
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if sshAgent := sshAgent(); sshAgent != nil {
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auth = append(auth, sshAgent)
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}
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}
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if config.SSHBastionPassword != "" {
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auth = append(auth,
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gossh.Password(config.SSHBastionPassword),
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@ -218,3 +228,19 @@ func sshBastionConfig(config *Config) (*gossh.ClientConfig, error) {
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Auth: auth,
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}, nil
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}
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func sshAgent() gossh.AuthMethod {
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if !sshagent.Available() {
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log.Println("[DEBUG] Error fetching SSH_AUTH_SOCK.")
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return nil
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}
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agent, _, err := sshagent.New()
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if err != nil {
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log.Printf("[WARN] sshagent.New: %v", err)
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return nil
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}
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log.Println("[INFO] Using SSH Agent.")
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return gossh.PublicKeysCallback(agent.Signers)
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}
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@ -0,0 +1,151 @@
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package communicator
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import (
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"bytes"
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"os"
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"os/exec"
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"path/filepath"
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"strconv"
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"testing"
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)
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// startAgent sets ssh-agent environment variables
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func startAgent(t *testing.T) func() {
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if testing.Short() {
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// ssh-agent is not always available, and the key
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// types supported vary by platform.
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t.Skip("skipping test due to -short or availability")
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}
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bin, err := exec.LookPath("ssh-agent")
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if err != nil {
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t.Skip("could not find ssh-agent")
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}
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cmd := exec.Command(bin, "-s")
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out, err := cmd.Output()
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if err != nil {
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t.Fatalf("cmd.Output: %v", err)
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}
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/* Output looks like:
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SSH_AUTH_SOCK=/tmp/ssh-P65gpcqArqvH/agent.15541; export SSH_AUTH_SOCK;
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SSH_AGENT_PID=15542; export SSH_AGENT_PID;
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echo Agent pid 15542;
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*/
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fields := bytes.Split(out, []byte(";"))
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line := bytes.SplitN(fields[0], []byte("="), 2)
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line[0] = bytes.TrimLeft(line[0], "\n")
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if string(line[0]) != "SSH_AUTH_SOCK" {
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t.Fatalf("could not find key SSH_AUTH_SOCK in %q", fields[0])
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}
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socket := string(line[1])
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t.Logf("Socket value: %v", socket)
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origSocket := os.Getenv("SSH_AUTH_SOCK")
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if err := os.Setenv("SSH_AUTH_SOCK", socket); err != nil {
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t.Fatalf("could not set SSH_AUTH_SOCK environment variable: %v", err)
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}
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line = bytes.SplitN(fields[2], []byte("="), 2)
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line[0] = bytes.TrimLeft(line[0], "\n")
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if string(line[0]) != "SSH_AGENT_PID" {
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t.Fatalf("could not find key SSH_AGENT_PID in %q", fields[2])
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}
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pidStr := line[1]
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t.Logf("Agent PID: %v", string(pidStr))
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pid, err := strconv.Atoi(string(pidStr))
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if err != nil {
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t.Fatalf("Atoi(%q): %v", pidStr, err)
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}
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return func() {
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proc, _ := os.FindProcess(pid)
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if proc != nil {
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proc.Kill()
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}
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os.Setenv("SSH_AUTH_SOCK", origSocket)
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os.RemoveAll(filepath.Dir(socket))
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}
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}
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func TestSSHAgent(t *testing.T) {
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cleanup := startAgent(t)
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defer cleanup()
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if auth := sshAgent(); auth == nil {
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t.Error("Want `ssh.AuthMethod`, got `nil`")
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}
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}
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func TestSSHBastionConfig(t *testing.T) {
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pemPath := TestPEM(t)
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tests := []struct {
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in *Config
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errStr string
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want int
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fn func() func()
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}{
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{
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in: &Config{SSHDisableAgent: true},
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want: 0,
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},
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{
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in: &Config{SSHDisableAgent: false},
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want: 0,
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fn: func() func() {
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cleanup := startAgent(t)
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os.Unsetenv("SSH_AUTH_SOCK")
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return cleanup
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},
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},
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{
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in: &Config{
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SSHDisableAgent: false,
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SSHBastionPassword: "foobar",
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SSHBastionPrivateKey: pemPath,
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},
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want: 4,
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fn: func() func() {
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cleanup := startAgent(t)
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return cleanup
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},
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},
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{
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in: &Config{
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SSHBastionPrivateKey: pemPath,
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},
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want: 0,
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errStr: "Failed to read key '" + pemPath + "': no key found",
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fn: func() func() {
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os.Truncate(pemPath, 0)
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return func() {
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if err := os.Remove(pemPath); err != nil {
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t.Fatalf("os.Remove: %v", err)
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}
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}
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},
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},
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}
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for _, c := range tests {
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func() {
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if c.fn != nil {
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defered := c.fn()
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defer defered()
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}
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bConf, err := sshBastionConfig(c.in)
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if err != nil {
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if err.Error() != c.errStr {
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t.Errorf("want error %v, got %q", c.errStr, err)
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}
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return
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}
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if len(bConf.Auth) != c.want {
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t.Errorf("want %v ssh.AuthMethod, got %v ssh.AuthMethod", c.want, len(bConf.Auth))
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}
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}()
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}
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}
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|
|
@ -0,0 +1,202 @@
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Apache License
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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@ -0,0 +1,23 @@
|
|||
# ssh-agent
|
||||
|
||||
Create a new [agent.Agent](https://godoc.org/golang.org/x/crypto/ssh/agent#Agent) on any type of OS (so including Windows) from any [Go](https://golang.org) application.
|
||||
|
||||
## Limitations
|
||||
|
||||
When compiled for Windows, it will only support [Pageant](http://the.earth.li/~sgtatham/putty/0.66/htmldoc/Chapter9.html#pageant) as the SSH authentication agent.
|
||||
|
||||
## Credits
|
||||
|
||||
Big thanks to [Давид Мзареулян (David Mzareulyan)](https://github.com/davidmz) for creating the [go-pageant](https://github.com/davidmz/go-pageant) package!
|
||||
|
||||
## Issues
|
||||
|
||||
If you have an issue: report it on the [issue tracker](https://github.com/xanzy/ssh-agent/issues)
|
||||
|
||||
## Author
|
||||
|
||||
Sander van Harmelen (<sander@xanzy.io>)
|
||||
|
||||
## License
|
||||
|
||||
The files `pageant_windows.go` and `sshagent_windows.go` have their own license (see file headers). The rest of this package is licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in compliance with the License. You may obtain a copy of the License at <http://www.apache.org/licenses/LICENSE-2.0>
|
||||
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@ -0,0 +1,146 @@
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//
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// Copyright (c) 2014 David Mzareulyan
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//
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// Permission is hereby granted, free of charge, to any person obtaining a copy of this software
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// and associated documentation files (the "Software"), to deal in the Software without restriction,
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//
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// portions of the Software.
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//
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// BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
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// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
|
||||
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||||
//
|
||||
|
||||
// +build windows
|
||||
|
||||
package sshagent
|
||||
|
||||
// see https://github.com/Yasushi/putty/blob/master/windows/winpgntc.c#L155
|
||||
// see https://github.com/paramiko/paramiko/blob/master/paramiko/win_pageant.py
|
||||
|
||||
import (
|
||||
"encoding/binary"
|
||||
"errors"
|
||||
"fmt"
|
||||
"sync"
|
||||
. "syscall"
|
||||
. "unsafe"
|
||||
)
|
||||
|
||||
// Maximum size of message can be sent to pageant
|
||||
const MaxMessageLen = 8192
|
||||
|
||||
var (
|
||||
ErrPageantNotFound = errors.New("pageant process not found")
|
||||
ErrSendMessage = errors.New("error sending message")
|
||||
|
||||
ErrMessageTooLong = errors.New("message too long")
|
||||
ErrInvalidMessageFormat = errors.New("invalid message format")
|
||||
ErrResponseTooLong = errors.New("response too long")
|
||||
)
|
||||
|
||||
const (
|
||||
agentCopydataID = 0x804e50ba
|
||||
wmCopydata = 74
|
||||
)
|
||||
|
||||
type copyData struct {
|
||||
dwData uintptr
|
||||
cbData uint32
|
||||
lpData Pointer
|
||||
}
|
||||
|
||||
var (
|
||||
lock sync.Mutex
|
||||
|
||||
winFindWindow = winAPI("user32.dll", "FindWindowW")
|
||||
winGetCurrentThreadID = winAPI("kernel32.dll", "GetCurrentThreadId")
|
||||
winSendMessage = winAPI("user32.dll", "SendMessageW")
|
||||
)
|
||||
|
||||
func winAPI(dllName, funcName string) func(...uintptr) (uintptr, uintptr, error) {
|
||||
proc := MustLoadDLL(dllName).MustFindProc(funcName)
|
||||
return func(a ...uintptr) (uintptr, uintptr, error) { return proc.Call(a...) }
|
||||
}
|
||||
|
||||
// Available returns true if Pageant is running
|
||||
func Available() bool { return pageantWindow() != 0 }
|
||||
|
||||
// Query sends message msg to Pageant and returns response or error.
|
||||
// 'msg' is raw agent request with length prefix
|
||||
// Response is raw agent response with length prefix
|
||||
func query(msg []byte) ([]byte, error) {
|
||||
if len(msg) > MaxMessageLen {
|
||||
return nil, ErrMessageTooLong
|
||||
}
|
||||
|
||||
msgLen := binary.BigEndian.Uint32(msg[:4])
|
||||
if len(msg) != int(msgLen)+4 {
|
||||
return nil, ErrInvalidMessageFormat
|
||||
}
|
||||
|
||||
lock.Lock()
|
||||
defer lock.Unlock()
|
||||
|
||||
paWin := pageantWindow()
|
||||
|
||||
if paWin == 0 {
|
||||
return nil, ErrPageantNotFound
|
||||
}
|
||||
|
||||
thID, _, _ := winGetCurrentThreadID()
|
||||
mapName := fmt.Sprintf("PageantRequest%08x", thID)
|
||||
pMapName, _ := UTF16PtrFromString(mapName)
|
||||
|
||||
mmap, err := CreateFileMapping(InvalidHandle, nil, PAGE_READWRITE, 0, MaxMessageLen+4, pMapName)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
defer CloseHandle(mmap)
|
||||
|
||||
ptr, err := MapViewOfFile(mmap, FILE_MAP_WRITE, 0, 0, 0)
|
||||
if err != nil {
|
||||
return nil, err
|
||||
}
|
||||
defer UnmapViewOfFile(ptr)
|
||||
|
||||
mmSlice := (*(*[MaxMessageLen]byte)(Pointer(ptr)))[:]
|
||||
|
||||
copy(mmSlice, msg)
|
||||
|
||||
mapNameBytesZ := append([]byte(mapName), 0)
|
||||
|
||||
cds := copyData{
|
||||
dwData: agentCopydataID,
|
||||
cbData: uint32(len(mapNameBytesZ)),
|
||||
lpData: Pointer(&(mapNameBytesZ[0])),
|
||||
}
|
||||
|
||||
resp, _, _ := winSendMessage(paWin, wmCopydata, 0, uintptr(Pointer(&cds)))
|
||||
|
||||
if resp == 0 {
|
||||
return nil, ErrSendMessage
|
||||
}
|
||||
|
||||
respLen := binary.BigEndian.Uint32(mmSlice[:4])
|
||||
if respLen > MaxMessageLen-4 {
|
||||
return nil, ErrResponseTooLong
|
||||
}
|
||||
|
||||
respData := make([]byte, respLen+4)
|
||||
copy(respData, mmSlice)
|
||||
|
||||
return respData, nil
|
||||
}
|
||||
|
||||
func pageantWindow() uintptr {
|
||||
nameP, _ := UTF16PtrFromString("Pageant")
|
||||
h, _, _ := winFindWindow(uintptr(Pointer(nameP)), uintptr(Pointer(nameP)))
|
||||
return h
|
||||
}
|
||||
|
|
@ -0,0 +1,49 @@
|
|||
//
|
||||
// Copyright 2015, Sander van Harmelen
|
||||
//
|
||||
// Licensed under the Apache License, Version 2.0 (the "License");
|
||||
// you may not use this file except in compliance with the License.
|
||||
// You may obtain a copy of the License at
|
||||
//
|
||||
// http://www.apache.org/licenses/LICENSE-2.0
|
||||
//
|
||||
// Unless required by applicable law or agreed to in writing, software
|
||||
// distributed under the License is distributed on an "AS IS" BASIS,
|
||||
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
||||
// See the License for the specific language governing permissions and
|
||||
// limitations under the License.
|
||||
//
|
||||
|
||||
// +build !windows
|
||||
|
||||
package sshagent
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"fmt"
|
||||
"net"
|
||||
"os"
|
||||
|
||||
"golang.org/x/crypto/ssh/agent"
|
||||
)
|
||||
|
||||
// New returns a new agent.Agent that uses a unix socket
|
||||
func New() (agent.Agent, net.Conn, error) {
|
||||
if !Available() {
|
||||
return nil, nil, errors.New("SSH agent requested but SSH_AUTH_SOCK not-specified")
|
||||
}
|
||||
|
||||
sshAuthSock := os.Getenv("SSH_AUTH_SOCK")
|
||||
|
||||
conn, err := net.Dial("unix", sshAuthSock)
|
||||
if err != nil {
|
||||
return nil, nil, fmt.Errorf("Error connecting to SSH_AUTH_SOCK: %v", err)
|
||||
}
|
||||
|
||||
return agent.NewClient(conn), conn, nil
|
||||
}
|
||||
|
||||
// Available returns true is a auth socket is defined
|
||||
func Available() bool {
|
||||
return os.Getenv("SSH_AUTH_SOCK") != ""
|
||||
}
|
||||
|
|
@ -0,0 +1,80 @@
|
|||
//
|
||||
// Copyright (c) 2014 David Mzareulyan
|
||||
//
|
||||
// Permission is hereby granted, free of charge, to any person obtaining a copy of this software
|
||||
// and associated documentation files (the "Software"), to deal in the Software without restriction,
|
||||
// including without limitation the rights to use, copy, modify, merge, publish, distribute,
|
||||
// sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
|
||||
// is furnished to do so, subject to the following conditions:
|
||||
//
|
||||
// The above copyright notice and this permission notice shall be included in all copies or substantial
|
||||
// portions of the Software.
|
||||
//
|
||||
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING
|
||||
// BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
// NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
|
||||
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
|
||||
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
|
||||
//
|
||||
|
||||
// +build windows
|
||||
|
||||
package sshagent
|
||||
|
||||
import (
|
||||
"errors"
|
||||
"io"
|
||||
"net"
|
||||
"sync"
|
||||
|
||||
"golang.org/x/crypto/ssh/agent"
|
||||
)
|
||||
|
||||
// New returns a new agent.Agent and the (custom) connection it uses
|
||||
// to communicate with a running pagent.exe instance (see README.md)
|
||||
func New() (agent.Agent, net.Conn, error) {
|
||||
if !Available() {
|
||||
return nil, nil, errors.New("SSH agent requested but Pageant not running")
|
||||
}
|
||||
|
||||
return agent.NewClient(&conn{}), nil, nil
|
||||
}
|
||||
|
||||
type conn struct {
|
||||
sync.Mutex
|
||||
buf []byte
|
||||
}
|
||||
|
||||
func (c *conn) Close() {
|
||||
c.Lock()
|
||||
defer c.Unlock()
|
||||
c.buf = nil
|
||||
}
|
||||
|
||||
func (c *conn) Write(p []byte) (int, error) {
|
||||
c.Lock()
|
||||
defer c.Unlock()
|
||||
|
||||
resp, err := query(p)
|
||||
if err != nil {
|
||||
return 0, err
|
||||
}
|
||||
|
||||
c.buf = append(c.buf, resp...)
|
||||
|
||||
return len(p), nil
|
||||
}
|
||||
|
||||
func (c *conn) Read(p []byte) (int, error) {
|
||||
c.Lock()
|
||||
defer c.Unlock()
|
||||
|
||||
if len(c.buf) == 0 {
|
||||
return 0, io.EOF
|
||||
}
|
||||
|
||||
n := copy(p, c.buf)
|
||||
c.buf = c.buf[n:]
|
||||
|
||||
return n, nil
|
||||
}
|
||||
|
|
@ -751,6 +751,12 @@
|
|||
"revision": "7d6a4449b586546246087e96e5c97dbc450f4917",
|
||||
"revisionTime": "2016-09-28T15:38:44Z"
|
||||
},
|
||||
{
|
||||
"checksumSHA1": "iHiMTBffQvWYlOLu3130JXuQpgQ=",
|
||||
"path": "github.com/xanzy/ssh-agent",
|
||||
"revision": "ba9c9e33906f58169366275e3450db66139a31a9",
|
||||
"revisionTime": "2015-12-15T15:34:51Z"
|
||||
},
|
||||
{
|
||||
"checksumSHA1": "h+pFYiRHBogczS8/F1NoN3Ata44=",
|
||||
"path": "golang.org/x/crypto/curve25519",
|
||||
|
|
|
|||
Loading…
Reference in New Issue