257 lines
8.5 KiB
Go
257 lines
8.5 KiB
Go
package registry
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import (
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"errors"
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"fmt"
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"net"
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"net/url"
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"strings"
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registrytypes "github.com/docker/docker/api/types/registry"
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"github.com/docker/docker/opts"
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flag "github.com/docker/docker/pkg/mflag"
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"github.com/docker/docker/reference"
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)
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// Options holds command line options.
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type Options struct {
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Mirrors opts.ListOpts
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InsecureRegistries opts.ListOpts
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}
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const (
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// DefaultNamespace is the default namespace
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DefaultNamespace = "docker.io"
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// DefaultRegistryVersionHeader is the name of the default HTTP header
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// that carries Registry version info
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DefaultRegistryVersionHeader = "Docker-Distribution-Api-Version"
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// IndexServer is the v1 registry server used for user auth + account creation
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IndexServer = DefaultV1Registry + "/v1/"
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// IndexName is the name of the index
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IndexName = "docker.io"
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// NotaryServer is the endpoint serving the Notary trust server
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NotaryServer = "https://notary.docker.io"
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// IndexServer = "https://registry-stage.hub.docker.com/v1/"
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)
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var (
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// ErrInvalidRepositoryName is an error returned if the repository name did
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// not have the correct form
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ErrInvalidRepositoryName = errors.New("Invalid repository name (ex: \"registry.domain.tld/myrepos\")")
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emptyServiceConfig = NewServiceConfig(nil)
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// V2Only controls access to legacy registries. If it is set to true via the
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// command line flag the daemon will not attempt to contact v1 legacy registries
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V2Only = false
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)
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// InstallFlags adds command-line options to the top-level flag parser for
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// the current process.
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func (options *Options) InstallFlags(cmd *flag.FlagSet, usageFn func(string) string) {
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options.Mirrors = opts.NewListOpts(ValidateMirror)
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cmd.Var(&options.Mirrors, []string{"-registry-mirror"}, usageFn("Preferred Docker registry mirror"))
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options.InsecureRegistries = opts.NewListOpts(ValidateIndexName)
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cmd.Var(&options.InsecureRegistries, []string{"-insecure-registry"}, usageFn("Enable insecure registry communication"))
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cmd.BoolVar(&V2Only, []string{"-disable-legacy-registry"}, false, usageFn("Do not contact legacy registries"))
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}
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// NewServiceConfig returns a new instance of ServiceConfig
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func NewServiceConfig(options *Options) *registrytypes.ServiceConfig {
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if options == nil {
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options = &Options{
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Mirrors: opts.NewListOpts(nil),
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InsecureRegistries: opts.NewListOpts(nil),
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}
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}
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// Localhost is by default considered as an insecure registry
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// This is a stop-gap for people who are running a private registry on localhost (especially on Boot2docker).
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//
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// TODO: should we deprecate this once it is easier for people to set up a TLS registry or change
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// daemon flags on boot2docker?
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options.InsecureRegistries.Set("127.0.0.0/8")
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config := ®istrytypes.ServiceConfig{
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InsecureRegistryCIDRs: make([]*registrytypes.NetIPNet, 0),
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IndexConfigs: make(map[string]*registrytypes.IndexInfo, 0),
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// Hack: Bypass setting the mirrors to IndexConfigs since they are going away
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// and Mirrors are only for the official registry anyways.
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Mirrors: options.Mirrors.GetAll(),
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}
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// Split --insecure-registry into CIDR and registry-specific settings.
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for _, r := range options.InsecureRegistries.GetAll() {
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// Check if CIDR was passed to --insecure-registry
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_, ipnet, err := net.ParseCIDR(r)
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if err == nil {
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// Valid CIDR.
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config.InsecureRegistryCIDRs = append(config.InsecureRegistryCIDRs, (*registrytypes.NetIPNet)(ipnet))
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} else {
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// Assume `host:port` if not CIDR.
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config.IndexConfigs[r] = ®istrytypes.IndexInfo{
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Name: r,
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Mirrors: make([]string, 0),
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Secure: false,
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Official: false,
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}
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}
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}
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// Configure public registry.
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config.IndexConfigs[IndexName] = ®istrytypes.IndexInfo{
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Name: IndexName,
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Mirrors: config.Mirrors,
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Secure: true,
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Official: true,
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}
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return config
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}
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// isSecureIndex returns false if the provided indexName is part of the list of insecure registries
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// Insecure registries accept HTTP and/or accept HTTPS with certificates from unknown CAs.
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//
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// The list of insecure registries can contain an element with CIDR notation to specify a whole subnet.
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// If the subnet contains one of the IPs of the registry specified by indexName, the latter is considered
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// insecure.
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//
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// indexName should be a URL.Host (`host:port` or `host`) where the `host` part can be either a domain name
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// or an IP address. If it is a domain name, then it will be resolved in order to check if the IP is contained
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// in a subnet. If the resolving is not successful, isSecureIndex will only try to match hostname to any element
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// of insecureRegistries.
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func isSecureIndex(config *registrytypes.ServiceConfig, indexName string) bool {
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// Check for configured index, first. This is needed in case isSecureIndex
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// is called from anything besides newIndexInfo, in order to honor per-index configurations.
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if index, ok := config.IndexConfigs[indexName]; ok {
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return index.Secure
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}
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host, _, err := net.SplitHostPort(indexName)
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if err != nil {
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// assume indexName is of the form `host` without the port and go on.
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host = indexName
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}
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addrs, err := lookupIP(host)
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if err != nil {
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ip := net.ParseIP(host)
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if ip != nil {
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addrs = []net.IP{ip}
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}
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// if ip == nil, then `host` is neither an IP nor it could be looked up,
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// either because the index is unreachable, or because the index is behind an HTTP proxy.
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// So, len(addrs) == 0 and we're not aborting.
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}
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// Try CIDR notation only if addrs has any elements, i.e. if `host`'s IP could be determined.
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for _, addr := range addrs {
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for _, ipnet := range config.InsecureRegistryCIDRs {
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// check if the addr falls in the subnet
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if (*net.IPNet)(ipnet).Contains(addr) {
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return false
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}
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}
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}
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return true
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}
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// ValidateMirror validates an HTTP(S) registry mirror
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func ValidateMirror(val string) (string, error) {
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uri, err := url.Parse(val)
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if err != nil {
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return "", fmt.Errorf("%s is not a valid URI", val)
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}
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if uri.Scheme != "http" && uri.Scheme != "https" {
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return "", fmt.Errorf("Unsupported scheme %s", uri.Scheme)
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}
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if uri.Path != "" || uri.RawQuery != "" || uri.Fragment != "" {
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return "", fmt.Errorf("Unsupported path/query/fragment at end of the URI")
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}
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return fmt.Sprintf("%s://%s/", uri.Scheme, uri.Host), nil
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}
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// ValidateIndexName validates an index name.
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func ValidateIndexName(val string) (string, error) {
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if val == reference.LegacyDefaultHostname {
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val = reference.DefaultHostname
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}
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if strings.HasPrefix(val, "-") || strings.HasSuffix(val, "-") {
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return "", fmt.Errorf("Invalid index name (%s). Cannot begin or end with a hyphen.", val)
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}
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return val, nil
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}
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func validateNoSchema(reposName string) error {
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if strings.Contains(reposName, "://") {
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// It cannot contain a scheme!
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return ErrInvalidRepositoryName
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}
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return nil
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}
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// newIndexInfo returns IndexInfo configuration from indexName
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func newIndexInfo(config *registrytypes.ServiceConfig, indexName string) (*registrytypes.IndexInfo, error) {
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var err error
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indexName, err = ValidateIndexName(indexName)
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if err != nil {
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return nil, err
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}
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// Return any configured index info, first.
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if index, ok := config.IndexConfigs[indexName]; ok {
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return index, nil
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}
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// Construct a non-configured index info.
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index := ®istrytypes.IndexInfo{
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Name: indexName,
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Mirrors: make([]string, 0),
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Official: false,
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}
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index.Secure = isSecureIndex(config, indexName)
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return index, nil
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}
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// GetAuthConfigKey special-cases using the full index address of the official
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// index as the AuthConfig key, and uses the (host)name[:port] for private indexes.
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func GetAuthConfigKey(index *registrytypes.IndexInfo) string {
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if index.Official {
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return IndexServer
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}
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return index.Name
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}
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// newRepositoryInfo validates and breaks down a repository name into a RepositoryInfo
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func newRepositoryInfo(config *registrytypes.ServiceConfig, name reference.Named) (*RepositoryInfo, error) {
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index, err := newIndexInfo(config, name.Hostname())
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if err != nil {
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return nil, err
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}
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official := !strings.ContainsRune(name.Name(), '/')
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return &RepositoryInfo{name, index, official}, nil
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}
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// ParseRepositoryInfo performs the breakdown of a repository name into a RepositoryInfo, but
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// lacks registry configuration.
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func ParseRepositoryInfo(reposName reference.Named) (*RepositoryInfo, error) {
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return newRepositoryInfo(emptyServiceConfig, reposName)
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}
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// ParseSearchIndexInfo will use repository name to get back an indexInfo.
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func ParseSearchIndexInfo(reposName string) (*registrytypes.IndexInfo, error) {
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indexName, _ := splitReposSearchTerm(reposName)
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indexInfo, err := newIndexInfo(emptyServiceConfig, indexName)
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if err != nil {
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return nil, err
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}
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return indexInfo, nil
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}
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