/
remote.go
817 lines (666 loc) · 19.2 KB
/
remote.go
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package lxc
import (
"crypto/x509"
"encoding/pem"
"fmt"
"net"
"net/url"
"os"
"sort"
"strings"
"github.com/spf13/cobra"
"golang.org/x/term"
"github.com/bketelsen/dlx/config"
"github.com/bketelsen/dlx/state"
lxd "github.com/lxc/lxd/client"
"github.com/lxc/lxd/lxc/utils"
"github.com/lxc/lxd/shared"
"github.com/lxc/lxd/shared/api"
cli "github.com/lxc/lxd/shared/cmd"
"github.com/lxc/lxd/shared/i18n"
)
type cmdRemote struct {
global *state.Global
}
func (c *cmdRemote) Command() *cobra.Command {
cmd := &cobra.Command{}
cmd.Use = usage("remote")
cmd.Short = i18n.G("Manage the list of remote servers")
cmd.Long = cli.FormatSection(i18n.G("Description"), i18n.G(
`Manage the list of remote servers`))
// Add
remoteAddCmd := cmdRemoteAdd{global: c.global, remote: c}
cmd.AddCommand(remoteAddCmd.Command())
// Get default
remoteGetDefaultCmd := cmdRemoteGetDefault{global: c.global, remote: c}
cmd.AddCommand(remoteGetDefaultCmd.Command())
// List
remoteListCmd := cmdRemoteList{global: c.global, remote: c}
cmd.AddCommand(remoteListCmd.Command())
// Rename
remoteRenameCmd := cmdRemoteRename{global: c.global, remote: c}
cmd.AddCommand(remoteRenameCmd.Command())
// Remove
remoteRemoveCmd := cmdRemoteRemove{global: c.global, remote: c}
cmd.AddCommand(remoteRemoveCmd.Command())
// Set default
remoteSwitchCmd := cmdRemoteSwitch{global: c.global, remote: c}
cmd.AddCommand(remoteSwitchCmd.Command())
// Set URL
remoteSetURLCmd := cmdRemoteSetURL{global: c.global, remote: c}
cmd.AddCommand(remoteSetURLCmd.Command())
// Workaround for subcommand usage errors. See: https://github.com/spf13/cobra/issues/706
cmd.Args = cobra.NoArgs
cmd.Run = func(cmd *cobra.Command, args []string) { cmd.Usage() }
return cmd
}
// Add
type cmdRemoteAdd struct {
global *state.Global
remote *cmdRemote
flagAcceptCert bool
flagPassword string
flagPublic bool
flagProtocol string
flagAuthType string
flagDomain string
flagProject string
}
func (c *cmdRemoteAdd) Command() *cobra.Command {
cmd := &cobra.Command{}
cmd.Use = usage("add", i18n.G("[<remote>] <IP|FQDN|URL>"))
cmd.Short = i18n.G("Add new remote servers")
cmd.Long = cli.FormatSection(i18n.G("Description"), i18n.G(
`Add new remote servers
URL for remote resources must be HTTPS (https://).
Basic authentication can be used when combined with the "simplestreams" protocol:
lxc remote add some-name https://LOGIN:PASSWORD@example.com/some/path --protocol=simplestreams
`))
cmd.RunE = c.Run
cmd.Flags().BoolVar(&c.flagAcceptCert, "accept-certificate", false, i18n.G("Accept certificate"))
cmd.Flags().StringVar(&c.flagPassword, "password", "", i18n.G("Remote admin password")+"``")
cmd.Flags().StringVar(&c.flagProtocol, "protocol", "", i18n.G("Server protocol (lxd or simplestreams)")+"``")
cmd.Flags().StringVar(&c.flagAuthType, "auth-type", "", i18n.G("Server authentication type (tls or candid)")+"``")
cmd.Flags().BoolVar(&c.flagPublic, "public", false, i18n.G("Public image server"))
cmd.Flags().StringVar(&c.flagDomain, "domain", "", i18n.G("Candid domain to use")+"``")
cmd.Flags().StringVar(&c.flagProject, "project", "", i18n.G("Project to use for the remote")+"``")
return cmd
}
func (c *cmdRemoteAdd) findProject(d lxd.InstanceServer, project string) (string, error) {
if project == "" {
// Check if we can pull a list of projects.
if d.HasExtension("projects") {
// Retrieve the allowed projects.
names, err := d.GetProjectNames()
if err != nil {
return "", err
}
if len(names) == 0 {
// If no allowed projects, just keep it to the default.
return "", nil
} else if len(names) == 1 {
// If only a single project, use that.
return names[0], nil
}
// Deal with multiple projects.
if shared.StringInSlice("default", names) {
// If we have access to the default project, use it.
return "", nil
}
// Let's ask the user.
fmt.Println(i18n.G("Available projects:"))
for _, name := range names {
fmt.Println(" - " + name)
}
return cli.AskChoice(i18n.G("Name of the project to use for this remote:")+" ", names, "")
}
return "", nil
}
_, _, err := d.GetProject(project)
if err != nil {
return "", err
}
return project, nil
}
func (c *cmdRemoteAdd) Run(cmd *cobra.Command, args []string) error {
conf := c.global.Conf
// Quick checks.
exit, err := c.global.CheckArgs(cmd, args, 1, 2)
if exit {
return err
}
// Determine server name and address
server := args[0]
addr := args[0]
if len(args) > 1 {
addr = args[1]
}
// Validate the server name.
if strings.Contains(server, ":") {
return fmt.Errorf(i18n.G("Remote names may not contain colons"))
}
// Check for existing remote
remote, ok := conf.Remotes[server]
if ok {
return fmt.Errorf(i18n.G("Remote %s exists as <%s>"), server, remote.Addr)
}
// Parse the URL
var rScheme string
var rHost string
var rPort string
if c.flagProtocol == "" {
c.flagProtocol = "lxd"
}
// Initialize the remotes list if needed
if conf.Remotes == nil {
conf.Remotes = map[string]config.Remote{}
}
// Complex remote URL parsing
remoteURL, err := url.Parse(addr)
if err != nil {
remoteURL = &url.URL{Host: addr}
}
// Fast track simplestreams
if c.flagProtocol == "simplestreams" {
if remoteURL.Scheme != "https" {
return fmt.Errorf(i18n.G("Only https URLs are supported for simplestreams"))
}
conf.Remotes[server] = config.Remote{Addr: addr, Public: true, Protocol: c.flagProtocol}
return conf.SaveConfig(c.global.ConfPath)
} else if c.flagProtocol != "lxd" {
return fmt.Errorf(i18n.G("Invalid protocol: %s"), c.flagProtocol)
}
// Fix broken URL parser
if !strings.Contains(addr, "://") && remoteURL.Scheme != "" && remoteURL.Scheme != "unix" && remoteURL.Host == "" {
remoteURL.Host = addr
remoteURL.Scheme = ""
}
if remoteURL.Scheme != "" {
if remoteURL.Scheme != "unix" && remoteURL.Scheme != "https" {
return fmt.Errorf(i18n.G("Invalid URL scheme \"%s\" in \"%s\""), remoteURL.Scheme, addr)
}
rScheme = remoteURL.Scheme
} else if addr[0] == '/' {
rScheme = "unix"
} else {
if !shared.IsUnixSocket(addr) {
rScheme = "https"
} else {
rScheme = "unix"
}
}
if remoteURL.Host != "" {
rHost = remoteURL.Host
} else {
rHost = addr
}
host, port, err := net.SplitHostPort(rHost)
if err == nil {
rHost = host
rPort = port
} else {
rPort = fmt.Sprintf("%d", shared.HTTPSDefaultPort)
}
if rScheme == "unix" {
rHost = strings.TrimPrefix(strings.TrimPrefix(addr, "unix:"), "//")
rPort = ""
}
if strings.Contains(rHost, ":") && !strings.HasPrefix(rHost, "[") {
rHost = fmt.Sprintf("[%s]", rHost)
}
if rPort != "" {
addr = rScheme + "://" + rHost + ":" + rPort
} else {
addr = rScheme + "://" + rHost
}
// Finally, actually add the remote, almost... If the remote is a private
// HTTPS server then we need to ensure we have a client certificate before
// adding the remote server.
if rScheme != "unix" && !c.flagPublic && (c.flagAuthType == "tls" || c.flagAuthType == "") {
if !conf.HasClientCertificate() {
fmt.Fprintf(os.Stderr, i18n.G("Generating a client certificate. This may take a minute...")+"\n")
err = conf.GenerateClientCertificate()
if err != nil {
return err
}
}
}
conf.Remotes[server] = config.Remote{Addr: addr, Protocol: c.flagProtocol, AuthType: c.flagAuthType, Domain: c.flagDomain}
// Attempt to connect
var d lxd.ImageServer
if c.flagPublic {
d, err = conf.GetImageServer(server)
} else {
d, err = conf.GetInstanceServer(server)
}
// Handle Unix socket connections
if strings.HasPrefix(addr, "unix:") {
if err != nil {
return err
}
remote := conf.Remotes[server]
remote.AuthType = "tls"
// Handle project.
project, err := c.findProject(d.(lxd.InstanceServer), c.flagProject)
if err != nil {
return err
}
remote.Project = project
conf.Remotes[server] = remote
return conf.SaveConfig(c.global.ConfPath)
}
// Check if the system CA worked for the TLS connection
var certificate *x509.Certificate
if err != nil {
// Failed to connect using the system CA, so retrieve the remote certificate
certificate, err = shared.GetRemoteCertificate(addr, c.global.Conf.UserAgent)
if err != nil {
return err
}
}
// Handle certificate prompt
if certificate != nil {
if !c.flagAcceptCert {
digest := shared.CertFingerprint(certificate)
fmt.Printf(i18n.G("Certificate fingerprint: %s")+"\n", digest)
fmt.Printf(i18n.G("ok (y/n/[fingerprint])?") + " ")
line, err := shared.ReadStdin()
if err != nil {
return err
}
if string(line) != digest {
if len(line) < 1 || strings.ToLower(string(line[0])) == i18n.G("n") {
return fmt.Errorf(i18n.G("Server certificate NACKed by user"))
} else if strings.ToLower(string(line[0])) != i18n.G("y") {
return fmt.Errorf(i18n.G("Please type 'y', 'n' or the fingerprint:"))
}
}
}
dnam := conf.ConfigPath("servercerts")
err := os.MkdirAll(dnam, 0750)
if err != nil {
return fmt.Errorf(i18n.G("Could not create server cert dir"))
}
certf := conf.ServerCertPath(server)
certOut, err := os.Create(certf)
if err != nil {
return err
}
pem.Encode(certOut, &pem.Block{Type: "CERTIFICATE", Bytes: certificate.Raw})
certOut.Close()
// Setup a new connection, this time with the remote certificate
if c.flagPublic {
d, err = conf.GetImageServer(server)
} else {
d, err = conf.GetInstanceServer(server)
}
if err != nil {
return err
}
}
// Handle public remotes
if c.flagPublic {
conf.Remotes[server] = config.Remote{Addr: addr, Public: true}
return conf.SaveConfig(c.global.ConfPath)
}
if c.flagAuthType == "candid" {
d.(lxd.InstanceServer).RequireAuthenticated(false)
}
// Get server information
srv, _, err := d.(lxd.InstanceServer).GetServer()
if err != nil {
return err
}
// If not specified, default authentication to Candid
if c.flagAuthType == "" {
if !srv.Public && shared.StringInSlice("candid", srv.AuthMethods) {
c.flagAuthType = "candid"
// Update the remote configuration
remote := conf.Remotes[server]
remote.AuthType = c.flagAuthType
conf.Remotes[server] = remote
// Re-setup the client
d, err = conf.GetInstanceServer(server)
if err != nil {
return err
}
d.(lxd.InstanceServer).RequireAuthenticated(false)
srv, _, err = d.(lxd.InstanceServer).GetServer()
if err != nil {
return err
}
} else {
c.flagAuthType = "tls"
// Update the remote configuration
remote := conf.Remotes[server]
remote.AuthType = c.flagAuthType
conf.Remotes[server] = remote
}
}
if !srv.Public && !shared.StringInSlice(c.flagAuthType, srv.AuthMethods) {
return fmt.Errorf(i18n.G("Authentication type '%s' not supported by server"), c.flagAuthType)
}
// Detect public remotes
if srv.Public {
conf.Remotes[server] = config.Remote{Addr: addr, Public: true}
return conf.SaveConfig(c.global.ConfPath)
}
// Check if additional authentication is required.
if srv.Auth != "trusted" {
if c.flagAuthType == "tls" {
// Prompt for trust password
if c.flagPassword == "" {
fmt.Printf(i18n.G("Admin password for %s:")+" ", server)
pwd, err := term.ReadPassword(0)
if err != nil {
/* We got an error, maybe this isn't a terminal, let's try to
* read it as a file */
pwd, err = shared.ReadStdin()
if err != nil {
return err
}
}
fmt.Println("")
c.flagPassword = string(pwd)
}
// Add client certificate to trust store
req := api.CertificatesPost{
Password: c.flagPassword,
}
req.Type = api.CertificateTypeClient
err = d.(lxd.InstanceServer).CreateCertificate(req)
if err != nil {
return err
}
} else {
d.(lxd.InstanceServer).RequireAuthenticated(true)
}
// And check if trusted now
srv, _, err = d.(lxd.InstanceServer).GetServer()
if err != nil {
return err
}
if srv.Auth != "trusted" {
return fmt.Errorf(i18n.G("Server doesn't trust us after authentication"))
}
if c.flagAuthType == "tls" {
fmt.Println(i18n.G("Client certificate stored at server:")+" ", server)
}
}
// Handle project.
remote = conf.Remotes[server]
project, err := c.findProject(d.(lxd.InstanceServer), c.flagProject)
if err != nil {
return err
}
remote.Project = project
conf.Remotes[server] = remote
return conf.SaveConfig(c.global.ConfPath)
}
// Get default
type cmdRemoteGetDefault struct {
global *state.Global
remote *cmdRemote
}
func (c *cmdRemoteGetDefault) Command() *cobra.Command {
cmd := &cobra.Command{}
cmd.Use = usage("get-default")
cmd.Short = i18n.G("Show the default remote")
cmd.Long = cli.FormatSection(i18n.G("Description"), i18n.G(
`Show the default remote`))
cmd.RunE = c.Run
return cmd
}
func (c *cmdRemoteGetDefault) Run(cmd *cobra.Command, args []string) error {
conf := c.global.Conf
// Quick checks.
exit, err := c.global.CheckArgs(cmd, args, 0, 0)
if exit {
return err
}
// Show the default remote
fmt.Println(conf.DefaultRemote)
return nil
}
// List
type cmdRemoteList struct {
global *state.Global
remote *cmdRemote
flagFormat string
}
func (c *cmdRemoteList) Command() *cobra.Command {
cmd := &cobra.Command{}
cmd.Use = usage("list")
cmd.Aliases = []string{"ls"}
cmd.Short = i18n.G("List the available remotes")
cmd.Long = cli.FormatSection(i18n.G("Description"), i18n.G(
`List the available remotes`))
cmd.RunE = c.Run
cmd.Flags().StringVarP(&c.flagFormat, "format", "f", "table", i18n.G("Format (csv|json|table|yaml)")+"``")
return cmd
}
func (c *cmdRemoteList) Run(cmd *cobra.Command, args []string) error {
conf := c.global.Conf
// Quick checks.
exit, err := c.global.CheckArgs(cmd, args, 0, 0)
if exit {
return err
}
// List the remotes
data := [][]string{}
for name, rc := range conf.Remotes {
strPublic := i18n.G("NO")
if rc.Public {
strPublic = i18n.G("YES")
}
strStatic := i18n.G("NO")
if rc.Static {
strStatic = i18n.G("YES")
}
strGlobal := i18n.G("NO")
if rc.Global {
strGlobal = i18n.G("YES")
}
if rc.Protocol == "" {
rc.Protocol = "lxd"
}
if rc.AuthType == "" {
if strings.HasPrefix(rc.Addr, "unix:") {
rc.AuthType = "file access"
} else if rc.Protocol == "simplestreams" {
rc.AuthType = "none"
} else {
rc.AuthType = "tls"
}
}
if rc.AuthType == "candid" && rc.Domain != "" {
rc.AuthType = fmt.Sprintf("%s (%s)", rc.AuthType, rc.Domain)
}
strName := name
if name == conf.DefaultRemote {
strName = fmt.Sprintf("%s (%s)", name, i18n.G("current"))
}
data = append(data, []string{strName, rc.Addr, rc.Protocol, rc.AuthType, strPublic, strStatic, strGlobal})
}
sort.Sort(byName(data))
header := []string{
i18n.G("NAME"),
i18n.G("URL"),
i18n.G("PROTOCOL"),
i18n.G("AUTH TYPE"),
i18n.G("PUBLIC"),
i18n.G("STATIC"),
i18n.G("GLOBAL"),
}
return utils.RenderTable(c.flagFormat, header, data, conf.Remotes)
}
// Rename
type cmdRemoteRename struct {
global *state.Global
remote *cmdRemote
}
func (c *cmdRemoteRename) Command() *cobra.Command {
cmd := &cobra.Command{}
cmd.Use = usage("rename", i18n.G("<remote> <new-name>"))
cmd.Aliases = []string{"mv"}
cmd.Short = i18n.G("Rename remotes")
cmd.Long = cli.FormatSection(i18n.G("Description"), i18n.G(
`Rename remotes`))
cmd.RunE = c.Run
return cmd
}
func (c *cmdRemoteRename) Run(cmd *cobra.Command, args []string) error {
conf := c.global.Conf
// Quick checks.
exit, err := c.global.CheckArgs(cmd, args, 2, 2)
if exit {
return err
}
// Rename the remote
rc, ok := conf.Remotes[args[0]]
if !ok {
return fmt.Errorf(i18n.G("Remote %s doesn't exist"), args[0])
}
if rc.Static {
return fmt.Errorf(i18n.G("Remote %s is static and cannot be modified"), args[0])
}
if _, ok := conf.Remotes[args[1]]; ok {
return fmt.Errorf(i18n.G("Remote %s already exists"), args[1])
}
// Rename the certificate file
oldPath := conf.ServerCertPath(args[0])
newPath := conf.ServerCertPath(args[1])
if shared.PathExists(oldPath) {
if conf.Remotes[args[0]].Global {
err := conf.CopyGlobalCert(args[0], args[1])
if err != nil {
return err
}
rc.Global = false
} else {
err := os.Rename(oldPath, newPath)
if err != nil {
return err
}
}
}
conf.Remotes[args[1]] = rc
delete(conf.Remotes, args[0])
if conf.DefaultRemote == args[0] {
conf.DefaultRemote = args[1]
}
return conf.SaveConfig(c.global.ConfPath)
}
// Remove
type cmdRemoteRemove struct {
global *state.Global
remote *cmdRemote
}
func (c *cmdRemoteRemove) Command() *cobra.Command {
cmd := &cobra.Command{}
cmd.Use = usage("remove", i18n.G("<remote>"))
cmd.Aliases = []string{"rm"}
cmd.Short = i18n.G("Remove remotes")
cmd.Long = cli.FormatSection(i18n.G("Description"), i18n.G(
`Remove remotes`))
cmd.RunE = c.Run
return cmd
}
func (c *cmdRemoteRemove) Run(cmd *cobra.Command, args []string) error {
conf := c.global.Conf
// Quick checks.
exit, err := c.global.CheckArgs(cmd, args, 1, 1)
if exit {
return err
}
// Remove the remote
rc, ok := conf.Remotes[args[0]]
if !ok {
return fmt.Errorf(i18n.G("Remote %s doesn't exist"), args[0])
}
if rc.Static {
return fmt.Errorf(i18n.G("Remote %s is static and cannot be modified"), args[0])
}
if rc.Global {
return fmt.Errorf(i18n.G("Remote %s is global and cannot be removed"), args[0])
}
if conf.DefaultRemote == args[0] {
return fmt.Errorf(i18n.G("Can't remove the default remote"))
}
delete(conf.Remotes, args[0])
os.Remove(conf.ServerCertPath(args[0]))
os.Remove(conf.CookiesPath(args[0]))
return conf.SaveConfig(c.global.ConfPath)
}
// Set default
type cmdRemoteSwitch struct {
global *state.Global
remote *cmdRemote
}
func (c *cmdRemoteSwitch) Command() *cobra.Command {
cmd := &cobra.Command{}
cmd.Aliases = []string{"set-default"}
cmd.Use = usage("switch", i18n.G("<remote>"))
cmd.Short = i18n.G("Switch the default remote")
cmd.Long = cli.FormatSection(i18n.G("Description"), i18n.G(
`Switch the default remote`))
cmd.RunE = c.Run
return cmd
}
func (c *cmdRemoteSwitch) Run(cmd *cobra.Command, args []string) error {
conf := c.global.Conf
// Quick checks.
exit, err := c.global.CheckArgs(cmd, args, 1, 1)
if exit {
return err
}
// Set the default remote
_, ok := conf.Remotes[args[0]]
if !ok {
return fmt.Errorf(i18n.G("Remote %s doesn't exist"), args[0])
}
conf.DefaultRemote = args[0]
return conf.SaveConfig(c.global.ConfPath)
}
// Set URL
type cmdRemoteSetURL struct {
global *state.Global
remote *cmdRemote
}
func (c *cmdRemoteSetURL) Command() *cobra.Command {
cmd := &cobra.Command{}
cmd.Use = usage("set-url", i18n.G("<remote> <URL>"))
cmd.Short = i18n.G("Set the URL for the remote")
cmd.Long = cli.FormatSection(i18n.G("Description"), i18n.G(
`Set the URL for the remote`))
cmd.RunE = c.Run
return cmd
}
func (c *cmdRemoteSetURL) Run(cmd *cobra.Command, args []string) error {
conf := c.global.Conf
// Quick checks.
exit, err := c.global.CheckArgs(cmd, args, 2, 2)
if exit {
return err
}
// Set the URL
rc, ok := conf.Remotes[args[0]]
if !ok {
return fmt.Errorf(i18n.G("Remote %s doesn't exist"), args[0])
}
if rc.Static {
return fmt.Errorf(i18n.G("Remote %s is static and cannot be modified"), args[0])
}
remote := conf.Remotes[args[0]]
if remote.Global {
err := conf.CopyGlobalCert(args[0], args[0])
if err != nil {
return err
}
remote.Global = false
conf.Remotes[args[0]] = remote
}
remote.Addr = args[1]
conf.Remotes[args[0]] = remote
return conf.SaveConfig(c.global.ConfPath)
}