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moby--moby/registry/registry.go
Michael Crosby 18edea2a6f Merge pull request #7609 from ewindisch/max_imgname
Restrict length of repository names
2014-09-08 11:06:54 -07:00

314 lines
8.9 KiB
Go

package registry
import (
"crypto/tls"
"crypto/x509"
"encoding/json"
"errors"
"fmt"
"io/ioutil"
"net"
"net/http"
"os"
"path"
"regexp"
"strings"
"time"
"github.com/docker/docker/pkg/log"
"github.com/docker/docker/utils"
)
var (
ErrAlreadyExists = errors.New("Image already exists")
ErrInvalidRepositoryName = errors.New("Invalid repository name (ex: \"registry.domain.tld/myrepos\")")
errLoginRequired = errors.New("Authentication is required.")
validHex = regexp.MustCompile(`^([a-f0-9]{64})$`)
)
type TimeoutType uint32
const (
NoTimeout TimeoutType = iota
ReceiveTimeout
ConnectTimeout
)
func newClient(jar http.CookieJar, roots *x509.CertPool, cert *tls.Certificate, timeout TimeoutType) *http.Client {
tlsConfig := tls.Config{RootCAs: roots}
if cert != nil {
tlsConfig.Certificates = append(tlsConfig.Certificates, *cert)
}
httpTransport := &http.Transport{
DisableKeepAlives: true,
Proxy: http.ProxyFromEnvironment,
TLSClientConfig: &tlsConfig,
}
switch timeout {
case ConnectTimeout:
httpTransport.Dial = func(proto string, addr string) (net.Conn, error) {
// Set the connect timeout to 5 seconds
conn, err := net.DialTimeout(proto, addr, 5*time.Second)
if err != nil {
return nil, err
}
// Set the recv timeout to 10 seconds
conn.SetDeadline(time.Now().Add(10 * time.Second))
return conn, nil
}
case ReceiveTimeout:
httpTransport.Dial = func(proto string, addr string) (net.Conn, error) {
conn, err := net.Dial(proto, addr)
if err != nil {
return nil, err
}
conn = utils.NewTimeoutConn(conn, 1*time.Minute)
return conn, nil
}
}
return &http.Client{
Transport: httpTransport,
CheckRedirect: AddRequiredHeadersToRedirectedRequests,
Jar: jar,
}
}
func doRequest(req *http.Request, jar http.CookieJar, timeout TimeoutType) (*http.Response, *http.Client, error) {
hasFile := func(files []os.FileInfo, name string) bool {
for _, f := range files {
if f.Name() == name {
return true
}
}
return false
}
hostDir := path.Join("/etc/docker/certs.d", req.URL.Host)
fs, err := ioutil.ReadDir(hostDir)
if err != nil && !os.IsNotExist(err) {
return nil, nil, err
}
var (
pool *x509.CertPool
certs []*tls.Certificate
)
for _, f := range fs {
if strings.HasSuffix(f.Name(), ".crt") {
if pool == nil {
pool = x509.NewCertPool()
}
data, err := ioutil.ReadFile(path.Join(hostDir, f.Name()))
if err != nil {
return nil, nil, err
}
pool.AppendCertsFromPEM(data)
}
if strings.HasSuffix(f.Name(), ".cert") {
certName := f.Name()
keyName := certName[:len(certName)-5] + ".key"
if !hasFile(fs, keyName) {
return nil, nil, fmt.Errorf("Missing key %s for certificate %s", keyName, certName)
}
cert, err := tls.LoadX509KeyPair(path.Join(hostDir, certName), path.Join(hostDir, keyName))
if err != nil {
return nil, nil, err
}
certs = append(certs, &cert)
}
if strings.HasSuffix(f.Name(), ".key") {
keyName := f.Name()
certName := keyName[:len(keyName)-4] + ".cert"
if !hasFile(fs, certName) {
return nil, nil, fmt.Errorf("Missing certificate %s for key %s", certName, keyName)
}
}
}
if len(certs) == 0 {
client := newClient(jar, pool, nil, timeout)
res, err := client.Do(req)
if err != nil {
return nil, nil, err
}
return res, client, nil
}
for i, cert := range certs {
client := newClient(jar, pool, cert, timeout)
res, err := client.Do(req)
// If this is the last cert, otherwise, continue to next cert if 403 or 5xx
if i == len(certs)-1 || err == nil && res.StatusCode != 403 && res.StatusCode < 500 {
return res, client, err
}
}
return nil, nil, nil
}
func pingRegistryEndpoint(endpoint string) (RegistryInfo, error) {
if endpoint == IndexServerAddress() {
// Skip the check, we now this one is valid
// (and we never want to fallback to http in case of error)
return RegistryInfo{Standalone: false}, nil
}
req, err := http.NewRequest("GET", endpoint+"_ping", nil)
if err != nil {
return RegistryInfo{Standalone: false}, err
}
resp, _, err := doRequest(req, nil, ConnectTimeout)
if err != nil {
return RegistryInfo{Standalone: false}, err
}
defer resp.Body.Close()
jsonString, err := ioutil.ReadAll(resp.Body)
if err != nil {
return RegistryInfo{Standalone: false}, fmt.Errorf("Error while reading the http response: %s", err)
}
// If the header is absent, we assume true for compatibility with earlier
// versions of the registry. default to true
info := RegistryInfo{
Standalone: true,
}
if err := json.Unmarshal(jsonString, &info); err != nil {
log.Debugf("Error unmarshalling the _ping RegistryInfo: %s", err)
// don't stop here. Just assume sane defaults
}
if hdr := resp.Header.Get("X-Docker-Registry-Version"); hdr != "" {
log.Debugf("Registry version header: '%s'", hdr)
info.Version = hdr
}
log.Debugf("RegistryInfo.Version: %q", info.Version)
standalone := resp.Header.Get("X-Docker-Registry-Standalone")
log.Debugf("Registry standalone header: '%s'", standalone)
if !strings.EqualFold(standalone, "true") && standalone != "1" && len(standalone) > 0 {
// there is a header set, and it is not "true" or "1", so assume fails
info.Standalone = false
}
log.Debugf("RegistryInfo.Standalone: %q", info.Standalone)
return info, nil
}
func validateRepositoryName(repositoryName string) error {
var (
namespace string
name string
)
nameParts := strings.SplitN(repositoryName, "/", 2)
if len(nameParts) < 2 {
namespace = "library"
name = nameParts[0]
if validHex.MatchString(name) {
return fmt.Errorf("Invalid repository name (%s), cannot specify 64-byte hexadecimal strings", name)
}
} else {
namespace = nameParts[0]
name = nameParts[1]
}
validNamespace := regexp.MustCompile(`^([a-z0-9_]{4,30})$`)
if !validNamespace.MatchString(namespace) {
return fmt.Errorf("Invalid namespace name (%s), only [a-z0-9_] are allowed, size between 4 and 30", namespace)
}
validRepo := regexp.MustCompile(`^([a-z0-9-_.]+)$`)
if !validRepo.MatchString(name) {
return fmt.Errorf("Invalid repository name (%s), only [a-z0-9-_.] are allowed", name)
}
return nil
}
// Resolves a repository name to a hostname + name
func ResolveRepositoryName(reposName string) (string, string, error) {
if strings.Contains(reposName, "://") {
// It cannot contain a scheme!
return "", "", ErrInvalidRepositoryName
}
nameParts := strings.SplitN(reposName, "/", 2)
if len(nameParts) == 1 || (!strings.Contains(nameParts[0], ".") && !strings.Contains(nameParts[0], ":") &&
nameParts[0] != "localhost") {
// This is a Docker Index repos (ex: samalba/hipache or ubuntu)
err := validateRepositoryName(reposName)
return IndexServerAddress(), reposName, err
}
hostname := nameParts[0]
reposName = nameParts[1]
if strings.Contains(hostname, "index.docker.io") {
return "", "", fmt.Errorf("Invalid repository name, try \"%s\" instead", reposName)
}
if err := validateRepositoryName(reposName); err != nil {
return "", "", err
}
return hostname, reposName, nil
}
// this method expands the registry name as used in the prefix of a repo
// to a full url. if it already is a url, there will be no change.
// The registry is pinged to test if it http or https
func ExpandAndVerifyRegistryUrl(hostname string) (string, error) {
if strings.HasPrefix(hostname, "http:") || strings.HasPrefix(hostname, "https:") {
// if there is no slash after https:// (8 characters) then we have no path in the url
if strings.LastIndex(hostname, "/") < 9 {
// there is no path given. Expand with default path
hostname = hostname + "/v1/"
}
if _, err := pingRegistryEndpoint(hostname); err != nil {
return "", errors.New("Invalid Registry endpoint: " + err.Error())
}
return hostname, nil
}
endpoint := fmt.Sprintf("https://%s/v1/", hostname)
if _, err := pingRegistryEndpoint(endpoint); err != nil {
log.Debugf("Registry %s does not work (%s), falling back to http", endpoint, err)
endpoint = fmt.Sprintf("http://%s/v1/", hostname)
if _, err = pingRegistryEndpoint(endpoint); err != nil {
//TODO: triggering highland build can be done there without "failing"
return "", errors.New("Invalid Registry endpoint: " + err.Error())
}
}
return endpoint, nil
}
func trustedLocation(req *http.Request) bool {
var (
trusteds = []string{"docker.com", "docker.io"}
hostname = strings.SplitN(req.Host, ":", 2)[0]
)
if req.URL.Scheme != "https" {
return false
}
for _, trusted := range trusteds {
if hostname == trusted || strings.HasSuffix(hostname, "."+trusted) {
return true
}
}
return false
}
func AddRequiredHeadersToRedirectedRequests(req *http.Request, via []*http.Request) error {
if via != nil && via[0] != nil {
if trustedLocation(req) && trustedLocation(via[0]) {
req.Header = via[0].Header
return nil
}
for k, v := range via[0].Header {
if k != "Authorization" {
for _, vv := range v {
req.Header.Add(k, vv)
}
}
}
}
return nil
}