func (s *SSHCommandSuite) TestCopy(c *gc.C) {
var opts ssh.Options
opts.EnablePTY()
opts.AllowPasswordAuthentication()
opts.SetIdentities("x", "y")
opts.SetPort(2022)
err := s.client.Copy([]string{"/tmp/blah", "[email protected]:baz"}, &opts)
c.Assert(err, jc.ErrorIsNil)
out, err := ioutil.ReadFile(s.fakescp + ".args")
c.Assert(err, jc.ErrorIsNil)
// EnablePTY has no effect for Copy
c.Assert(string(out), gc.Equals, s.fakescp+" -o StrictHostKeyChecking no -o ServerAliveInterval 30 -i x -i y -P 2022 /tmp/blah [email protected]:baz\n")
// Try passing extra args
err = s.client.Copy([]string{"/tmp/blah", "[email protected]:baz", "-r", "-v"}, &opts)
c.Assert(err, jc.ErrorIsNil)
out, err = ioutil.ReadFile(s.fakescp + ".args")
c.Assert(err, jc.ErrorIsNil)
c.Assert(string(out), gc.Equals, s.fakescp+" -o StrictHostKeyChecking no -o ServerAliveInterval 30 -i x -i y -P 2022 /tmp/blah [email protected]:baz -r -v\n")
// Try interspersing extra args
err = s.client.Copy([]string{"-r", "/tmp/blah", "-v", "[email protected]:baz"}, &opts)
c.Assert(err, jc.ErrorIsNil)
out, err = ioutil.ReadFile(s.fakescp + ".args")
c.Assert(err, jc.ErrorIsNil)
c.Assert(string(out), gc.Equals, s.fakescp+" -o StrictHostKeyChecking no -o ServerAliveInterval 30 -i x -i y -P 2022 -r /tmp/blah -v [email protected]:baz\n")
}
func (s *SSHCommandSuite) TestCommandEnablePTY(c *gc.C) {
var opts ssh.Options
opts.EnablePTY()
s.assertCommandArgs(c, s.commandOptions([]string{echoCommand, "123"}, &opts),
fmt.Sprintf("%s -o StrictHostKeyChecking no -o PasswordAuthentication no -o ServerAliveInterval 30 -t -t localhost %s 123",
s.fakessh, echoCommand),
)
}
// getSSHOptions configures and returns SSH options and proxy settings.
func (c *SSHCommon) getSSHOptions(enablePty bool) (*ssh.Options, error) {
var options ssh.Options
// TODO(waigani) do not save fingerprint only until this bug is addressed:
// lp:892552. Also see lp:1334481.
options.SetKnownHostsFile("/dev/null")
if enablePty {
options.EnablePTY()
}
var err error
if c.proxy, err = c.proxySSH(); err != nil {
return nil, err
} else if c.proxy {
if err := c.setProxyCommand(&options); err != nil {
return nil, err
}
}
return &options, nil
}
// getSSHOptions configures SSH options based on command line
// arguments and the SSH targets specified.
func (c *SSHCommon) getSSHOptions(enablePty bool, targets ...*resolvedTarget) (*ssh.Options, error) {
var options ssh.Options
if c.noHostKeyChecks {
options.SetStrictHostKeyChecking(ssh.StrictHostChecksNo)
options.SetKnownHostsFile("/dev/null")
} else {
knownHostsPath, err := c.generateKnownHosts(targets)
if err != nil {
return nil, errors.Trace(err)
}
// There might not be a custom known_hosts file if the SSH
// targets are specified using arbitrary hostnames or
// addresses. In this case, the user's personal known_hosts
// file is used.
if knownHostsPath != "" {
// When a known_hosts file has been generated, enforce
// strict host key checking.
options.SetStrictHostKeyChecking(ssh.StrictHostChecksYes)
options.SetKnownHostsFile(knownHostsPath)
} else {
// If the user's personal known_hosts is used, also use
// the user's personal StrictHostKeyChecking preferences.
options.SetStrictHostKeyChecking(ssh.StrictHostChecksUnset)
}
}
if enablePty {
options.EnablePTY()
}
if c.proxy {
if err := c.setProxyCommand(&options); err != nil {
return nil, err
}
}
return &options, nil
}
// InitUbuntuUser adds the ubuntu user if it doesn't
// already exist, updates its ~/.ssh/authorized_keys,
// and enables passwordless sudo for it.
//
// InitUbuntuUser will initially attempt to login as
// the ubuntu user, and verify that passwordless sudo
// is enabled; only if this is false will there be an
// attempt with the specified login.
//
// authorizedKeys may be empty, in which case the file
// will be created and left empty.
//
// stdin and stdout will be used for remote sudo prompts,
// if the ubuntu user must be created/updated.
func InitUbuntuUser(host, login, authorizedKeys string, stdin io.Reader, stdout io.Writer) error {
logger.Infof("initialising %q, user %q", host, login)
// To avoid unnecessary prompting for the specified login,
// initUbuntuUser will first attempt to ssh to the machine
// as "ubuntu" with password authentication disabled, and
// ensure that it can use sudo without a password.
//
// Note that we explicitly do not allocate a PTY, so we
// get a failure if sudo prompts.
cmd := ssh.Command("ubuntu@"+host, []string{"sudo", "-n", "true"}, nil)
if cmd.Run() == nil {
logger.Infof("ubuntu user is already initialised")
return nil
}
// Failed to login as ubuntu (or passwordless sudo is not enabled).
// Use specified login, and execute the initUbuntuScript below.
if login != "" {
host = login + "@" + host
}
script := fmt.Sprintf(initUbuntuScript, utils.ShQuote(authorizedKeys))
var options ssh.Options
options.AllowPasswordAuthentication()
options.EnablePTY()
cmd = ssh.Command(host, []string{"sudo", "/bin/bash -c " + utils.ShQuote(script)}, &options)
var stderr bytes.Buffer
cmd.Stdin = stdin
cmd.Stdout = stdout // for sudo prompt
cmd.Stderr = &stderr
if err := cmd.Run(); err != nil {
if stderr.Len() != 0 {
err = fmt.Errorf("%v (%v)", err, strings.TrimSpace(stderr.String()))
}
return err
}
return nil
}