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package system
import (
"bytes"
"fmt"
"net"
"net/url"
"os"
"os/user"
"regexp"
"github.com/containers/common/pkg/config"
"github.com/containers/libpod/v2/cmd/podman/registry"
"github.com/containers/libpod/v2/libpod/define"
"github.com/containers/libpod/v2/pkg/domain/entities"
"github.com/containers/libpod/v2/pkg/terminal"
"github.com/pkg/errors"
"github.com/sirupsen/logrus"
"github.com/spf13/cobra"
"golang.org/x/crypto/ssh"
"golang.org/x/crypto/ssh/agent"
)
const schemaPattern = "^[A-Za-z][A-Za-z0-9+.-]*:"
var (
// Skip creating engines since this command will obtain connection information to engine
noOp = func(cmd *cobra.Command, args []string) error {
return nil
}
connectionCmd = &cobra.Command{
Use: "connection [flags] DESTINATION",
Args: cobra.ExactArgs(1),
Long: `Store ssh destination information in podman configuration.
"destination" is of the form [user@]hostname or
an URI of the form ssh://[user@]hostname[:port]
`,
Short: "Record remote ssh destination",
PersistentPreRunE: noOp,
PersistentPostRunE: noOp,
TraverseChildren: false,
RunE: connection,
Example: `podman system connection server.fubar.com
podman system connection --identity ~/.ssh/dev_rsa ssh://root@server.fubar.com:2222
podman system connection --identity ~/.ssh/dev_rsa --port 22 root@server.fubar.com`,
}
cOpts = struct {
Identity string
Port int
UDSPath string
}{}
)
func init() {
registry.Commands = append(registry.Commands, registry.CliCommand{
Mode: []entities.EngineMode{entities.ABIMode, entities.TunnelMode},
Command: connectionCmd,
Parent: systemCmd,
})
flags := connectionCmd.Flags()
flags.IntVarP(&cOpts.Port, "port", "p", 22, "SSH port number for destination")
flags.StringVar(&cOpts.Identity, "identity", "", "path to SSH identity file")
flags.StringVar(&cOpts.UDSPath, "socket-path", "", "path to podman socket on remote host. (default '/run/podman/podman.sock' or '/run/user/{uid}/podman/podman.sock)")
}
func connection(cmd *cobra.Command, args []string) error {
// Default to ssh: schema if none given
dest := []byte(args[0])
if match, err := regexp.Match(schemaPattern, dest); err != nil {
return errors.Wrapf(err, "internal regex error %q", schemaPattern)
} else if !match {
dest = append([]byte("ssh://"), dest...)
}
uri, err := url.Parse(string(dest))
if err != nil {
return errors.Wrapf(err, "failed to parse %q", string(dest))
}
if uri.User.Username() == "" {
if uri.User, err = getUserInfo(uri); err != nil {
return err
}
}
if cmd.Flag("socket-path").Changed {
uri.Path = cmd.Flag("socket-path").Value.String()
}
if cmd.Flag("port").Changed {
uri.Host = net.JoinHostPort(uri.Hostname(), cmd.Flag("port").Value.String())
}
if uri.Port() == "" {
uri.Host = net.JoinHostPort(uri.Hostname(), cmd.Flag("port").DefValue)
}
if uri.Path == "" {
if uri.Path, err = getUDS(cmd, uri); err != nil {
return errors.Wrapf(err, "failed to connect to %q", uri.String())
}
}
custom, err := config.ReadCustomConfig()
if err != nil {
return err
}
if cmd.Flag("identity").Changed {
custom.Engine.RemoteIdentity = cOpts.Identity
}
custom.Engine.RemoteURI = uri.String()
return custom.Write()
}
func getUserInfo(uri *url.URL) (*url.Userinfo, error) {
var (
usr *user.User
err error
)
if u, found := os.LookupEnv("_CONTAINERS_ROOTLESS_UID"); found {
usr, err = user.LookupId(u)
if err != nil {
return nil, errors.Wrapf(err, "failed to find user %q", u)
}
} else {
usr, err = user.Current()
if err != nil {
return nil, errors.Wrapf(err, "failed to obtain current user")
}
}
pw, set := uri.User.Password()
if set {
return url.UserPassword(usr.Username, pw), nil
}
return url.User(usr.Username), nil
}
func getUDS(cmd *cobra.Command, uri *url.URL) (string, error) {
var authMethods []ssh.AuthMethod
passwd, set := uri.User.Password()
if set {
authMethods = append(authMethods, ssh.Password(passwd))
}
ident := cmd.Flag("identity")
if ident.Changed {
auth, err := terminal.PublicKey(ident.Value.String(), []byte(passwd))
if err != nil {
return "", errors.Wrapf(err, "Failed to read identity %q", ident.Value.String())
}
authMethods = append(authMethods, auth)
}
if sock, found := os.LookupEnv("SSH_AUTH_SOCK"); found {
logrus.Debugf("Found SSH_AUTH_SOCK %q, ssh-agent signer enabled", sock)
c, err := net.Dial("unix", sock)
if err != nil {
return "", err
}
a := agent.NewClient(c)
authMethods = append(authMethods, ssh.PublicKeysCallback(a.Signers))
}
config := &ssh.ClientConfig{
User: uri.User.Username(),
Auth: authMethods,
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
dial, err := ssh.Dial("tcp", uri.Host, config)
if err != nil {
return "", errors.Wrapf(err, "failed to connect to %q", uri.Host)
}
defer dial.Close()
session, err := dial.NewSession()
if err != nil {
return "", errors.Wrapf(err, "failed to create new ssh session on %q", uri.Host)
}
defer session.Close()
// Override podman binary for testing etc
podman := "podman"
if v, found := os.LookupEnv("PODMAN_BINARY"); found {
podman = v
}
run := podman + " info --format=json"
var buffer bytes.Buffer
session.Stdout = &buffer
if err := session.Run(run); err != nil {
return "", errors.Wrapf(err, "failed to run %q", run)
}
var info define.Info
if err := json.Unmarshal(buffer.Bytes(), &info); err != nil {
return "", errors.Wrapf(err, "failed to parse 'podman info' results")
}
if info.Host.RemoteSocket == nil || len(info.Host.RemoteSocket.Path) == 0 {
return "", fmt.Errorf("remote podman %q failed to report its UDS socket", uri.Host)
}
return info.Host.RemoteSocket.Path, nil
}
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