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george.go
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george.go
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package main
import (
"crypto/aes"
"crypto/cipher"
"crypto/rand"
"crypto/sha512"
"encoding/base32"
"errors"
"fmt"
"io"
"io/ioutil"
"log"
"os"
"os/exec"
"os/user"
"path/filepath"
"strings"
"time"
"golang.org/x/crypto/ssh"
"github.com/gobwas/glob"
"github.com/zippoxer/george/forge"
)
type George struct {
client *forge.Client
cache *cache
homeDir string
}
func New(client *forge.Client, cacheMaxAge time.Duration) (*George, error) {
usr, err := user.Current()
if err != nil {
panic(err)
}
g := &George{
client: client,
cache: newCache(client),
homeDir: usr.HomeDir,
}
if err := g.loadCache(cacheMaxAge); err != nil {
log.Printf("error loading george cache: %v", err)
}
return g, nil
}
func (g *George) loadCache(maxAge time.Duration) error {
return g.cache.Load(filepath.Join(g.homeDir, ".george-cache"), maxAge)
}
func (g *George) dumpCache() error {
return g.cache.Dump(filepath.Join(g.homeDir, ".george-cache"))
}
func (g *George) Search(pattern string) (*forge.Server, *forge.Site, error) {
serverGlob, siteGlob, err := g.compileSearchPattern(pattern)
if err != nil {
return nil, nil, err
}
if siteGlob != nil {
return g.SearchSite(pattern)
}
servers, err := g.cache.Servers()
if err != nil {
return nil, nil, err
}
var matchingServers []forge.Server
for _, server := range servers {
if serverGlob.Match(server.Name) || serverGlob.Match(server.IPAddress) {
matchingServers = append(matchingServers, server)
}
}
if len(matchingServers) > 1 {
err = g.printServers(servers, serverGlob, siteGlob)
if err != nil {
return nil, nil, err
}
return nil, nil, fmt.Errorf("More than one server matches %q.", pattern)
}
if len(matchingServers) == 0 {
return g.SearchSite(pattern)
}
return &matchingServers[0], nil, nil
}
func (g *George) SearchSite(pattern string) (*forge.Server, *forge.Site, error) {
serverGlob, siteGlob, err := g.compileSearchPattern(pattern)
if err != nil {
return nil, nil, err
}
servers, err := g.cache.Servers()
if err != nil {
return nil, nil, err
}
serverSites, err := g.cache.ServerSites(servers)
if err != nil {
return nil, nil, err
}
if err := g.dumpCache(); err != nil {
log.Printf("error dumping george cache: %v", err)
}
var matchingSites []forge.Site
for _, server := range serverSites {
if siteGlob != nil && !serverGlob.Match(server.Name) && !serverGlob.Match(server.IPAddress) {
continue
}
for _, site := range server.Sites {
if siteGlob == nil && serverGlob.Match(site.Name) ||
siteGlob != nil && siteGlob.Match(site.Name) {
matchingSites = append(matchingSites, site)
}
}
}
if len(matchingSites) > 1 {
err = g.printServers(servers, serverGlob, siteGlob)
if err != nil {
return nil, nil, err
}
return nil, nil, fmt.Errorf("More than one site matches %q.", pattern)
}
if len(matchingSites) == 0 {
err = g.printServers(servers, serverGlob, siteGlob)
if err != nil {
return nil, nil, err
}
return nil, nil, fmt.Errorf("Server or site not found.")
}
site := &matchingSites[0]
var server *forge.Server
for _, s := range servers {
if s.Id == site.ServerId {
server = &s
break
}
}
if server == nil {
return nil, nil, fmt.Errorf("Site found, but it's server wasn't found. Seems like data is corrupt.")
}
return server, site, nil
}
func (g *George) compileSearchPattern(pattern string) (server, site glob.Glob, err error) {
var serverPat, sitePat string
patterns := strings.Split(strings.ToLower(pattern), ":")
if len(patterns) == 2 {
serverPat, sitePat = patterns[0], patterns[1]
} else {
serverPat, sitePat = patterns[0], ""
}
if serverPat == "" {
serverPat = "*"
}
server, err = glob.Compile(serverPat)
if err != nil {
return
}
if sitePat != "" {
site, err = glob.Compile(sitePat)
}
return
}
func (g *George) printServers(servers []forge.Server, serverGlob, siteGlob glob.Glob) error {
fmt.Printf("Available servers:\n")
serverSites, err := g.cache.ServerSites(servers)
if err != nil {
return err
}
for _, server := range serverSites {
match := serverGlob == nil ||
serverGlob.Match(server.Name) ||
serverGlob.Match(server.IPAddress)
for _, site := range server.Sites {
if siteGlob == nil && serverGlob.Match(site.Name) ||
siteGlob != nil && siteGlob.Match(site.Name) {
match = true
break
}
}
if match {
fmt.Printf(" %s (%s)\n", server.Name, server.IPAddress)
for _, site := range server.Sites {
if siteGlob == nil && serverGlob.Match(site.Name) ||
siteGlob != nil && siteGlob.Match(site.Name) {
fmt.Printf(" %s\n", site.Name)
}
}
}
}
return nil
}
func (g *George) SSH(serverId int) (*ssh.Session, error) {
err := g.SSHInstallKey(serverId)
if err != nil {
return nil, err
}
privateKeyBytes, err := g.sshPrivateKey()
if err != nil {
return nil, err
}
privateKey, err := ssh.ParsePrivateKey(privateKeyBytes)
if err != nil {
return nil, err
}
config := &ssh.ClientConfig{
User: "forge",
Auth: []ssh.AuthMethod{
ssh.PublicKeys(privateKey),
},
HostKeyCallback: ssh.InsecureIgnoreHostKey(),
}
server, err := g.cache.Server(serverId)
if err != nil {
return nil, err
}
client, err := ssh.Dial("tcp", fmt.Sprintf("%s:22", server.IPAddress), config)
if err != nil {
return nil, err
}
return client.NewSession()
}
// SSHInstallKey registers the public SSH key with the given forge server,
// returning an error if installation failed.
func (g *George) SSHInstallKey(serverId int) error {
publicKey, err := g.sshPublicKey()
if err != nil {
return err
}
keyName := g.sshKeyName(publicKey)
keys, err := g.client.Keys(serverId).List()
if err != nil {
return err
}
var key *forge.Key
for i := range keys {
if keys[i].Name == keyName {
key = &keys[i]
break
}
}
if key == nil {
key, err := g.client.Keys(serverId).Create(keyName, string(publicKey))
if err != nil {
return err
}
for key.Status == "installing" {
key, err = g.client.Keys(serverId).Get(key.Id)
if err != nil {
return err
}
time.Sleep(time.Millisecond * 500)
}
if key.Status != "installed" {
return fmt.Errorf("failed installing SSH key: status is %v", key.Status)
}
}
return nil
}
func (g *George) sshPrivateKey() ([]byte, error) {
filename := g.SSHPrivateKeyPath()
data, err := ioutil.ReadFile(filename)
if os.IsNotExist(err) || len(data) == 0 {
err = g.sshKeygen(filename)
if err != nil {
return nil, err
}
return g.sshPrivateKey()
}
return data, err
}
func (g *George) sshPublicKey() ([]byte, error) {
filename := g.SSHPrivateKeyPath()
filenamePub := g.SSHPublicKeyPath()
data, err := ioutil.ReadFile(filenamePub)
if os.IsNotExist(err) || len(data) == 0 {
err = g.sshKeygen(filename)
if err != nil {
return nil, err
}
return g.sshPublicKey()
}
return data, err
}
func (g *George) sshKeygen(privateKeyPath string) error {
fmt.Println("Generating an SSH key...")
// -N="" means empty password.
_, err := exec.Command("ssh-keygen", "-N", "", "-f", privateKeyPath).CombinedOutput()
return err
}
// sshKeyName returns a unique, irreversible and reproducible name for the given SSH key.
func (s *George) sshKeyName(key []byte) string {
sum := sha512.Sum512_224(key)
sumStr := base32.StdEncoding.WithPadding(base32.NoPadding).EncodeToString(sum[:])
return "george-" + sumStr
}
func (g *George) SSHPrivateKeyPath() string {
return filepath.Join(g.homeDir, ".ssh", "id_rsa")
}
func (g *George) SSHPublicKeyPath() string {
return g.SSHPrivateKeyPath() + ".pub"
}
// Encrypt encrypts data using 256-bit AES-GCM. This both hides the content of
// the data and provides a check that it hasn't been altered. Output takes the
// form nonce|ciphertext|tag where '|' indicates concatenation.
func Encrypt(plaintext []byte, key *[32]byte) (ciphertext []byte, err error) {
block, err := aes.NewCipher(key[:])
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(block)
if err != nil {
return nil, err
}
nonce := make([]byte, gcm.NonceSize())
_, err = io.ReadFull(rand.Reader, nonce)
if err != nil {
return nil, err
}
return gcm.Seal(nonce, nonce, plaintext, nil), nil
}
// Decrypt decrypts data using 256-bit AES-GCM. This both hides the content of
// the data and provides a check that it hasn't been altered. Expects input
// form nonce|ciphertext|tag where '|' indicates concatenation.
func Decrypt(ciphertext []byte, key *[32]byte) (plaintext []byte, err error) {
block, err := aes.NewCipher(key[:])
if err != nil {
return nil, err
}
gcm, err := cipher.NewGCM(block)
if err != nil {
return nil, err
}
if len(ciphertext) < gcm.NonceSize() {
return nil, errors.New("malformed ciphertext")
}
return gcm.Open(nil,
ciphertext[:gcm.NonceSize()],
ciphertext[gcm.NonceSize():],
nil,
)
}