distribution/registry/handlers/app.go
James Hewitt c40c4b289a
Enable configuration of index dependency validation
Enable configuration options that can selectively disable validation
that dependencies exist within the registry before the image index
is uploaded.

This enables sparse indexes, where a registry holds a manifest index that
could be signed (so the digest must not change) but does not hold every
referenced image in the index. The use case for this is when a registry
mirror does not need to mirror all platforms, but does need to maintain
the digests of all manifests either because they are signed or because
they are pulled by digest.

The registry administrator can also select specific image architectures
that must exist in the registry, enabling a registry operator to select
only the platforms they care about and ensure all image indexes uploaded
to the registry are valid for those platforms.

Signed-off-by: James Hewitt <james.hewitt@uk.ibm.com>
2024-05-28 09:56:14 +01:00

1079 lines
37 KiB
Go

package handlers
import (
"context"
"crypto/rand"
"expvar"
"fmt"
"math"
"math/big"
"net"
"net/http"
"net/url"
"os"
"regexp"
"runtime"
"strconv"
"strings"
"time"
"github.com/distribution/distribution/v3"
"github.com/distribution/distribution/v3/configuration"
"github.com/distribution/distribution/v3/health"
"github.com/distribution/distribution/v3/health/checks"
"github.com/distribution/distribution/v3/internal/dcontext"
prometheus "github.com/distribution/distribution/v3/metrics"
"github.com/distribution/distribution/v3/notifications"
"github.com/distribution/distribution/v3/registry/api/errcode"
v2 "github.com/distribution/distribution/v3/registry/api/v2"
"github.com/distribution/distribution/v3/registry/auth"
registrymiddleware "github.com/distribution/distribution/v3/registry/middleware/registry"
repositorymiddleware "github.com/distribution/distribution/v3/registry/middleware/repository"
"github.com/distribution/distribution/v3/registry/proxy"
"github.com/distribution/distribution/v3/registry/storage"
memorycache "github.com/distribution/distribution/v3/registry/storage/cache/memory"
rediscache "github.com/distribution/distribution/v3/registry/storage/cache/redis"
storagedriver "github.com/distribution/distribution/v3/registry/storage/driver"
"github.com/distribution/distribution/v3/registry/storage/driver/factory"
storagemiddleware "github.com/distribution/distribution/v3/registry/storage/driver/middleware"
"github.com/distribution/distribution/v3/version"
"github.com/distribution/reference"
events "github.com/docker/go-events"
"github.com/docker/go-metrics"
"github.com/gorilla/mux"
"github.com/redis/go-redis/extra/redisotel/v9"
"github.com/redis/go-redis/v9"
"github.com/sirupsen/logrus"
)
// randomSecretSize is the number of random bytes to generate if no secret
// was specified.
const randomSecretSize = 32
// defaultCheckInterval is the default time in between health checks
const defaultCheckInterval = 10 * time.Second
// App is a global registry application object. Shared resources can be placed
// on this object that will be accessible from all requests. Any writable
// fields should be protected.
type App struct {
context.Context
Config *configuration.Configuration
router *mux.Router // main application router, configured with dispatchers
driver storagedriver.StorageDriver // driver maintains the app global storage driver instance.
registry distribution.Namespace // registry is the primary registry backend for the app instance.
repoRemover distribution.RepositoryRemover // repoRemover provides ability to delete repos
accessController auth.AccessController // main access controller for application
// httpHost is a parsed representation of the http.host parameter from
// the configuration. Only the Scheme and Host fields are used.
httpHost url.URL
// events contains notification related configuration.
events struct {
sink events.Sink
source notifications.SourceRecord
}
redis *redis.Client
// isCache is true if this registry is configured as a pull through cache
isCache bool
// readOnly is true if the registry is in a read-only maintenance mode
readOnly bool
}
// NewApp takes a configuration and returns a configured app, ready to serve
// requests. The app only implements ServeHTTP and can be wrapped in other
// handlers accordingly.
func NewApp(ctx context.Context, config *configuration.Configuration) *App {
app := &App{
Config: config,
Context: ctx,
router: v2.RouterWithPrefix(config.HTTP.Prefix),
isCache: config.Proxy.RemoteURL != "",
}
// Register the handler dispatchers.
app.register(v2.RouteNameBase, func(ctx *Context, r *http.Request) http.Handler {
return http.HandlerFunc(apiBase)
})
app.register(v2.RouteNameManifest, manifestDispatcher)
app.register(v2.RouteNameCatalog, catalogDispatcher)
app.register(v2.RouteNameTags, tagsDispatcher)
app.register(v2.RouteNameBlob, blobDispatcher)
app.register(v2.RouteNameBlobUpload, blobUploadDispatcher)
app.register(v2.RouteNameBlobUploadChunk, blobUploadDispatcher)
// override the storage driver's UA string for registry outbound HTTP requests
storageParams := config.Storage.Parameters()
if storageParams == nil {
storageParams = make(configuration.Parameters)
}
if storageParams["useragent"] == "" {
storageParams["useragent"] = fmt.Sprintf("distribution/%s %s", version.Version(), runtime.Version())
}
var err error
app.driver, err = factory.Create(app, config.Storage.Type(), storageParams)
if err != nil {
// TODO(stevvooe): Move the creation of a service into a protected
// method, where this is created lazily. Its status can be queried via
// a health check.
panic(err)
}
purgeConfig := uploadPurgeDefaultConfig()
if mc, ok := config.Storage["maintenance"]; ok {
if v, ok := mc["uploadpurging"]; ok {
purgeConfig, ok = v.(map[interface{}]interface{})
if !ok {
panic("uploadpurging config key must contain additional keys")
}
}
if v, ok := mc["readonly"]; ok {
readOnly, ok := v.(map[interface{}]interface{})
if !ok {
panic("readonly config key must contain additional keys")
}
if readOnlyEnabled, ok := readOnly["enabled"]; ok {
app.readOnly, ok = readOnlyEnabled.(bool)
if !ok {
panic("readonly's enabled config key must have a boolean value")
}
}
}
}
startUploadPurger(app, app.driver, dcontext.GetLogger(app), purgeConfig)
app.driver, err = applyStorageMiddleware(app, app.driver, config.Middleware["storage"])
if err != nil {
panic(err)
}
// Do not configure HTTP secret for a proxy registry as HTTP secret
// is only used for blob uploads and a proxy registry does not support blob uploads.
if !app.isCache {
app.configureSecret(config)
}
app.configureEvents(config)
app.configureRedis(config)
app.configureLogHook(config)
options := registrymiddleware.GetRegistryOptions()
if config.HTTP.Host != "" {
u, err := url.Parse(config.HTTP.Host)
if err != nil {
panic(fmt.Sprintf(`could not parse http "host" parameter: %v`, err))
}
app.httpHost = *u
}
if app.isCache {
options = append(options, storage.DisableDigestResumption)
}
// configure deletion
if d, ok := config.Storage["delete"]; ok {
e, ok := d["enabled"]
if ok {
if deleteEnabled, ok := e.(bool); ok && deleteEnabled {
options = append(options, storage.EnableDelete)
}
}
}
// configure tag lookup concurrency limit
if p := config.Storage.TagParameters(); p != nil {
l, ok := p["concurrencylimit"]
if ok {
limit, ok := l.(int)
if !ok {
panic("tag lookup concurrency limit config key must have a integer value")
}
if limit < 0 {
panic("tag lookup concurrency limit should be a non-negative integer value")
}
options = append(options, storage.TagLookupConcurrencyLimit(limit))
}
}
// configure redirects
var redirectDisabled bool
if redirectConfig, ok := config.Storage["redirect"]; ok {
v := redirectConfig["disable"]
switch v := v.(type) {
case bool:
redirectDisabled = v
default:
panic(fmt.Sprintf("invalid type for redirect config: %#v", redirectConfig))
}
}
if redirectDisabled {
dcontext.GetLogger(app).Infof("backend redirection disabled")
} else {
options = append(options, storage.EnableRedirect)
}
if !config.Validation.Enabled {
config.Validation.Enabled = !config.Validation.Disabled
}
// configure validation
if config.Validation.Enabled {
if len(config.Validation.Manifests.URLs.Allow) == 0 && len(config.Validation.Manifests.URLs.Deny) == 0 {
// If Allow and Deny are empty, allow nothing.
options = append(options, storage.ManifestURLsAllowRegexp(regexp.MustCompile("^$")))
} else {
if len(config.Validation.Manifests.URLs.Allow) > 0 {
for i, s := range config.Validation.Manifests.URLs.Allow {
// Validate via compilation.
if _, err := regexp.Compile(s); err != nil {
panic(fmt.Sprintf("validation.manifests.urls.allow: %s", err))
}
// Wrap with non-capturing group.
config.Validation.Manifests.URLs.Allow[i] = fmt.Sprintf("(?:%s)", s)
}
re := regexp.MustCompile(strings.Join(config.Validation.Manifests.URLs.Allow, "|"))
options = append(options, storage.ManifestURLsAllowRegexp(re))
}
if len(config.Validation.Manifests.URLs.Deny) > 0 {
for i, s := range config.Validation.Manifests.URLs.Deny {
// Validate via compilation.
if _, err := regexp.Compile(s); err != nil {
panic(fmt.Sprintf("validation.manifests.urls.deny: %s", err))
}
// Wrap with non-capturing group.
config.Validation.Manifests.URLs.Deny[i] = fmt.Sprintf("(?:%s)", s)
}
re := regexp.MustCompile(strings.Join(config.Validation.Manifests.URLs.Deny, "|"))
options = append(options, storage.ManifestURLsDenyRegexp(re))
}
}
switch config.Validation.Manifests.Indexes.Platforms {
case "list":
options = append(options, storage.EnableValidateImageIndexImagesExist)
for _, platform := range config.Validation.Manifests.Indexes.PlatformList {
options = append(options, storage.AddValidateImageIndexImagesExistPlatform(platform.Architecture, platform.OS))
}
fallthrough
case "none":
dcontext.GetLogger(app).Warn("Image index completeness validation has been disabled, which is an experimental option because other container tooling might expect all image indexes to be complete")
case "all":
fallthrough
default:
options = append(options, storage.EnableValidateImageIndexImagesExist)
}
}
// configure storage caches
if cc, ok := config.Storage["cache"]; ok {
v, ok := cc["blobdescriptor"]
if !ok {
// Backwards compatible: "layerinfo" == "blobdescriptor"
v = cc["layerinfo"]
}
switch v {
case "redis":
if app.redis == nil {
panic("redis configuration required to use for layerinfo cache")
}
if _, ok := cc["blobdescriptorsize"]; ok {
dcontext.GetLogger(app).Warnf("blobdescriptorsize parameter is not supported with redis cache")
}
cacheProvider := rediscache.NewRedisBlobDescriptorCacheProvider(app.redis)
localOptions := append(options, storage.BlobDescriptorCacheProvider(cacheProvider))
app.registry, err = storage.NewRegistry(app, app.driver, localOptions...)
if err != nil {
panic("could not create registry: " + err.Error())
}
dcontext.GetLogger(app).Infof("using redis blob descriptor cache")
case "inmemory":
blobDescriptorSize := memorycache.DefaultSize
configuredSize, ok := cc["blobdescriptorsize"]
if ok {
// Since Parameters is not strongly typed, render to a string and convert back
blobDescriptorSize, err = strconv.Atoi(fmt.Sprint(configuredSize))
if err != nil {
panic(fmt.Sprintf("invalid blobdescriptorsize value %s: %s", configuredSize, err))
}
}
cacheProvider := memorycache.NewInMemoryBlobDescriptorCacheProvider(blobDescriptorSize)
localOptions := append(options, storage.BlobDescriptorCacheProvider(cacheProvider))
app.registry, err = storage.NewRegistry(app, app.driver, localOptions...)
if err != nil {
panic("could not create registry: " + err.Error())
}
dcontext.GetLogger(app).Infof("using inmemory blob descriptor cache")
default:
if v != "" {
dcontext.GetLogger(app).Warnf("unknown cache type %q, caching disabled", config.Storage["cache"])
}
}
}
if app.registry == nil {
// configure the registry if no cache section is available.
app.registry, err = storage.NewRegistry(app.Context, app.driver, options...)
if err != nil {
panic("could not create registry: " + err.Error())
}
}
app.registry, err = applyRegistryMiddleware(app, app.registry, app.driver, config.Middleware["registry"])
if err != nil {
panic(err)
}
authType := config.Auth.Type()
if authType != "" && !strings.EqualFold(authType, "none") {
accessController, err := auth.GetAccessController(config.Auth.Type(), config.Auth.Parameters())
if err != nil {
panic(fmt.Sprintf("unable to configure authorization (%s): %v", authType, err))
}
app.accessController = accessController
dcontext.GetLogger(app).Debugf("configured %q access controller", authType)
}
// configure as a pull through cache
if config.Proxy.RemoteURL != "" {
app.registry, err = proxy.NewRegistryPullThroughCache(ctx, app.registry, app.driver, config.Proxy)
if err != nil {
panic(err.Error())
}
app.isCache = true
dcontext.GetLogger(app).Info("Registry configured as a proxy cache to ", config.Proxy.RemoteURL)
}
var ok bool
app.repoRemover, ok = app.registry.(distribution.RepositoryRemover)
if !ok {
dcontext.GetLogger(app).Warnf("Registry does not implement RepositoryRemover. Will not be able to delete repos and tags")
}
return app
}
// RegisterHealthChecks is an awful hack to defer health check registration
// control to callers. This should only ever be called once per registry
// process, typically in a main function. The correct way would be register
// health checks outside of app, since multiple apps may exist in the same
// process. Because the configuration and app are tightly coupled,
// implementing this properly will require a refactor. This method may panic
// if called twice in the same process.
func (app *App) RegisterHealthChecks(healthRegistries ...*health.Registry) {
if len(healthRegistries) > 1 {
panic("RegisterHealthChecks called with more than one registry")
}
healthRegistry := health.DefaultRegistry
if len(healthRegistries) == 1 {
healthRegistry = healthRegistries[0]
}
if app.Config.Health.StorageDriver.Enabled {
interval := app.Config.Health.StorageDriver.Interval
if interval == 0 {
interval = defaultCheckInterval
}
storageDriverCheck := health.CheckFunc(func(ctx context.Context) error {
_, err := app.driver.Stat(ctx, "/") // "/" should always exist
if _, ok := err.(storagedriver.PathNotFoundError); ok {
err = nil // pass this through, backend is responding, but this path doesn't exist.
}
if err != nil {
dcontext.GetLogger(ctx).Errorf("storage driver health check: %v", err)
}
return err
})
updater := health.NewThresholdStatusUpdater(app.Config.Health.StorageDriver.Threshold)
healthRegistry.Register("storagedriver_"+app.Config.Storage.Type(), updater)
go health.Poll(app, updater, storageDriverCheck, interval)
}
for _, fileChecker := range app.Config.Health.FileCheckers {
interval := fileChecker.Interval
if interval == 0 {
interval = defaultCheckInterval
}
dcontext.GetLogger(app).Infof("configuring file health check path=%s, interval=%d", fileChecker.File, interval/time.Second)
u := health.NewStatusUpdater()
healthRegistry.Register(fileChecker.File, u)
go health.Poll(app, u, checks.FileChecker(fileChecker.File), interval)
}
for _, httpChecker := range app.Config.Health.HTTPCheckers {
interval := httpChecker.Interval
if interval == 0 {
interval = defaultCheckInterval
}
statusCode := httpChecker.StatusCode
if statusCode == 0 {
statusCode = 200
}
checker := checks.HTTPChecker(httpChecker.URI, statusCode, httpChecker.Timeout, httpChecker.Headers)
dcontext.GetLogger(app).Infof("configuring HTTP health check uri=%s, interval=%d, threshold=%d", httpChecker.URI, interval/time.Second, httpChecker.Threshold)
updater := health.NewThresholdStatusUpdater(httpChecker.Threshold)
healthRegistry.Register(httpChecker.URI, updater)
go health.Poll(app, updater, checker, interval)
}
for _, tcpChecker := range app.Config.Health.TCPCheckers {
interval := tcpChecker.Interval
if interval == 0 {
interval = defaultCheckInterval
}
checker := checks.TCPChecker(tcpChecker.Addr, tcpChecker.Timeout)
dcontext.GetLogger(app).Infof("configuring TCP health check addr=%s, interval=%d, threshold=%d", tcpChecker.Addr, interval/time.Second, tcpChecker.Threshold)
updater := health.NewThresholdStatusUpdater(tcpChecker.Threshold)
healthRegistry.Register(tcpChecker.Addr, updater)
go health.Poll(app, updater, checker, interval)
}
}
// Shutdown close the underlying registry
func (app *App) Shutdown() error {
if r, ok := app.registry.(proxy.Closer); ok {
return r.Close()
}
return nil
}
// register a handler with the application, by route name. The handler will be
// passed through the application filters and context will be constructed at
// request time.
func (app *App) register(routeName string, dispatch dispatchFunc) {
handler := app.dispatcher(dispatch)
// Chain the handler with prometheus instrumented handler
if app.Config.HTTP.Debug.Prometheus.Enabled {
namespace := metrics.NewNamespace(prometheus.NamespacePrefix, "http", nil)
httpMetrics := namespace.NewDefaultHttpMetrics(strings.Replace(routeName, "-", "_", -1))
metrics.Register(namespace)
handler = metrics.InstrumentHandler(httpMetrics, handler)
}
// TODO(stevvooe): This odd dispatcher/route registration is by-product of
// some limitations in the gorilla/mux router. We are using it to keep
// routing consistent between the client and server, but we may want to
// replace it with manual routing and structure-based dispatch for better
// control over the request execution.
app.router.GetRoute(routeName).Handler(handler)
}
// configureEvents prepares the event sink for action.
func (app *App) configureEvents(configuration *configuration.Configuration) {
// Configure all of the endpoint sinks.
// NOTE(milosgajdos): we are disabling the linter here as
// if an endpoint is disabled we continue with the evaluation
// of the next one so we do not know the exact size the slice
// should have at the time the iteration starts
// nolint:prealloc
var sinks []events.Sink
for _, endpoint := range configuration.Notifications.Endpoints {
if endpoint.Disabled {
dcontext.GetLogger(app).Infof("endpoint %s disabled, skipping", endpoint.Name)
continue
}
dcontext.GetLogger(app).Infof("configuring endpoint %v (%v), timeout=%s, headers=%v", endpoint.Name, endpoint.URL, endpoint.Timeout, endpoint.Headers)
endpoint := notifications.NewEndpoint(endpoint.Name, endpoint.URL, notifications.EndpointConfig{
Timeout: endpoint.Timeout,
Threshold: endpoint.Threshold,
Backoff: endpoint.Backoff,
Headers: endpoint.Headers,
IgnoredMediaTypes: endpoint.IgnoredMediaTypes,
Ignore: endpoint.Ignore,
})
sinks = append(sinks, endpoint)
}
// NOTE(stevvooe): Moving to a new queuing implementation is as easy as
// replacing broadcaster with a rabbitmq implementation. It's recommended
// that the registry instances also act as the workers to keep deployment
// simple.
app.events.sink = events.NewBroadcaster(sinks...)
// Populate registry event source
hostname, err := os.Hostname()
if err != nil {
hostname = configuration.HTTP.Addr
} else {
// try to pick the port off the config
_, port, err := net.SplitHostPort(configuration.HTTP.Addr)
if err == nil {
hostname = net.JoinHostPort(hostname, port)
}
}
app.events.source = notifications.SourceRecord{
Addr: hostname,
InstanceID: dcontext.GetStringValue(app, "instance.id"),
}
}
func (app *App) configureRedis(cfg *configuration.Configuration) {
if cfg.Redis.Addr == "" {
dcontext.GetLogger(app).Infof("redis not configured")
return
}
app.redis = app.createPool(cfg.Redis)
// Enable metrics instrumentation.
if err := redisotel.InstrumentMetrics(app.redis); err != nil {
dcontext.GetLogger(app).Errorf("failed to instrument metrics on redis: %v", err)
}
// setup expvar
registry := expvar.Get("registry")
if registry == nil {
registry = expvar.NewMap("registry")
}
registry.(*expvar.Map).Set("redis", expvar.Func(func() interface{} {
stats := app.redis.PoolStats()
return map[string]interface{}{
"Config": cfg,
"Active": stats.TotalConns - stats.IdleConns,
}
}))
}
func (app *App) createPool(cfg configuration.Redis) *redis.Client {
return redis.NewClient(&redis.Options{
Addr: cfg.Addr,
OnConnect: func(ctx context.Context, cn *redis.Conn) error {
res := cn.Ping(ctx)
return res.Err()
},
Username: cfg.Username,
Password: cfg.Password,
DB: cfg.DB,
MaxRetries: 3,
DialTimeout: cfg.DialTimeout,
ReadTimeout: cfg.ReadTimeout,
WriteTimeout: cfg.WriteTimeout,
PoolFIFO: false,
MaxIdleConns: cfg.Pool.MaxIdle,
PoolSize: cfg.Pool.MaxActive,
ConnMaxIdleTime: cfg.Pool.IdleTimeout,
})
}
// configureLogHook prepares logging hook parameters.
func (app *App) configureLogHook(configuration *configuration.Configuration) {
entry, ok := dcontext.GetLogger(app).(*logrus.Entry)
if !ok {
// somehow, we are not using logrus
return
}
logger := entry.Logger
for _, configHook := range configuration.Log.Hooks {
if !configHook.Disabled {
switch configHook.Type {
case "mail":
hook := &logHook{}
hook.LevelsParam = configHook.Levels
hook.Mail = &mailer{
Addr: configHook.MailOptions.SMTP.Addr,
Username: configHook.MailOptions.SMTP.Username,
Password: configHook.MailOptions.SMTP.Password,
Insecure: configHook.MailOptions.SMTP.Insecure,
From: configHook.MailOptions.From,
To: configHook.MailOptions.To,
}
logger.Hooks.Add(hook)
default:
}
}
}
}
// configureSecret creates a random secret if a secret wasn't included in the
// configuration.
func (app *App) configureSecret(configuration *configuration.Configuration) {
if configuration.HTTP.Secret == "" {
var secretBytes [randomSecretSize]byte
if _, err := rand.Read(secretBytes[:]); err != nil {
panic(fmt.Sprintf("could not generate random bytes for HTTP secret: %v", err))
}
configuration.HTTP.Secret = string(secretBytes[:])
dcontext.GetLogger(app).Warn("No HTTP secret provided - generated random secret. This may cause problems with uploads if multiple registries are behind a load-balancer. To provide a shared secret, fill in http.secret in the configuration file or set the REGISTRY_HTTP_SECRET environment variable.")
}
}
func (app *App) ServeHTTP(w http.ResponseWriter, r *http.Request) {
// Prepare the context with our own little decorations.
ctx := r.Context()
ctx = dcontext.WithRequest(ctx, r)
ctx, w = dcontext.WithResponseWriter(ctx, w)
ctx = dcontext.WithLogger(ctx, dcontext.GetRequestLogger(ctx))
r = r.WithContext(ctx)
// Set a header with the Docker Distribution API Version for all responses.
w.Header().Add("Docker-Distribution-API-Version", "registry/2.0")
app.router.ServeHTTP(w, r)
}
// dispatchFunc takes a context and request and returns a constructed handler
// for the route. The dispatcher will use this to dynamically create request
// specific handlers for each endpoint without creating a new router for each
// request.
type dispatchFunc func(ctx *Context, r *http.Request) http.Handler
// TODO(stevvooe): dispatchers should probably have some validation error
// chain with proper error reporting.
// dispatcher returns a handler that constructs a request specific context and
// handler, using the dispatch factory function.
func (app *App) dispatcher(dispatch dispatchFunc) http.Handler {
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
for headerName, headerValues := range app.Config.HTTP.Headers {
for _, value := range headerValues {
w.Header().Add(headerName, value)
}
}
context := app.context(w, r)
defer func() {
// Automated error response handling here. Handlers may return their
// own errors if they need different behavior (such as range errors
// for layer upload).
if context.Errors.Len() > 0 {
_ = errcode.ServeJSON(w, context.Errors)
app.logError(context, context.Errors)
} else if status, ok := context.Value("http.response.status").(int); ok && status >= 200 && status <= 399 {
dcontext.GetResponseLogger(context).Infof("response completed")
}
}()
if err := app.authorized(w, r, context); err != nil {
dcontext.GetLogger(context).Warnf("error authorizing context: %v", err)
return
}
// Add username to request logging
context.Context = dcontext.WithLogger(context.Context, dcontext.GetLogger(context.Context, userNameKey))
// sync up context on the request.
r = r.WithContext(context)
if app.nameRequired(r) {
nameRef, err := reference.WithName(getName(context))
if err != nil {
dcontext.GetLogger(context).Errorf("error parsing reference from context: %v", err)
context.Errors = append(context.Errors, distribution.ErrRepositoryNameInvalid{
Name: getName(context),
Reason: err,
})
if err := errcode.ServeJSON(w, context.Errors); err != nil {
dcontext.GetLogger(context).Errorf("error serving error json: %v (from %v)", err, context.Errors)
}
return
}
repository, err := app.registry.Repository(context, nameRef)
if err != nil {
dcontext.GetLogger(context).Errorf("error resolving repository: %v", err)
switch err := err.(type) {
case distribution.ErrRepositoryUnknown:
context.Errors = append(context.Errors, errcode.ErrorCodeNameUnknown.WithDetail(err))
case distribution.ErrRepositoryNameInvalid:
context.Errors = append(context.Errors, errcode.ErrorCodeNameInvalid.WithDetail(err))
case errcode.Error:
context.Errors = append(context.Errors, err)
}
if err := errcode.ServeJSON(w, context.Errors); err != nil {
dcontext.GetLogger(context).Errorf("error serving error json: %v (from %v)", err, context.Errors)
}
return
}
// assign and decorate the authorized repository with an event bridge.
context.Repository, context.RepositoryRemover = notifications.Listen(
repository,
context.App.repoRemover,
app.eventBridge(context, r))
context.Repository, err = applyRepoMiddleware(app, context.Repository, app.Config.Middleware["repository"])
if err != nil {
dcontext.GetLogger(context).Errorf("error initializing repository middleware: %v", err)
context.Errors = append(context.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
if err := errcode.ServeJSON(w, context.Errors); err != nil {
dcontext.GetLogger(context).Errorf("error serving error json: %v (from %v)", err, context.Errors)
}
return
}
}
dispatch(context, r).ServeHTTP(w, r)
})
}
type errCodeKey struct{}
func (errCodeKey) String() string { return "err.code" }
type errMessageKey struct{}
func (errMessageKey) String() string { return "err.message" }
type errDetailKey struct{}
func (errDetailKey) String() string { return "err.detail" }
func (app *App) logError(ctx context.Context, errors errcode.Errors) {
for _, e1 := range errors {
var c context.Context
switch e := e1.(type) {
case errcode.Error:
c = context.WithValue(ctx, errCodeKey{}, e.Code)
c = context.WithValue(c, errMessageKey{}, e.Message)
c = context.WithValue(c, errDetailKey{}, e.Detail)
case errcode.ErrorCode:
c = context.WithValue(ctx, errCodeKey{}, e)
c = context.WithValue(c, errMessageKey{}, e.Message())
default:
// just normal go 'error'
c = context.WithValue(ctx, errCodeKey{}, errcode.ErrorCodeUnknown)
c = context.WithValue(c, errMessageKey{}, e.Error())
}
c = dcontext.WithLogger(c, dcontext.GetLogger(c,
errCodeKey{},
errMessageKey{},
errDetailKey{}))
dcontext.GetResponseLogger(c).Errorf("response completed with error")
}
}
// context constructs the context object for the application. This only be
// called once per request.
func (app *App) context(w http.ResponseWriter, r *http.Request) *Context {
ctx := r.Context()
ctx = dcontext.WithVars(ctx, r)
ctx = dcontext.WithLogger(ctx, dcontext.GetLogger(ctx,
"vars.name",
"vars.reference",
"vars.digest",
"vars.uuid"))
context := &Context{
App: app,
Context: ctx,
}
if app.httpHost.Scheme != "" && app.httpHost.Host != "" {
// A "host" item in the configuration takes precedence over
// X-Forwarded-Proto and X-Forwarded-Host headers, and the
// hostname in the request.
context.urlBuilder = v2.NewURLBuilder(&app.httpHost, false)
} else {
context.urlBuilder = v2.NewURLBuilderFromRequest(r, app.Config.HTTP.RelativeURLs)
}
return context
}
// authorized checks if the request can proceed with access to the requested
// repository. If it succeeds, the context may access the requested
// repository. An error will be returned if access is not available.
func (app *App) authorized(w http.ResponseWriter, r *http.Request, context *Context) error {
dcontext.GetLogger(context).Debug("authorizing request")
repo := getName(context)
if app.accessController == nil {
return nil // access controller is not enabled.
}
var accessRecords []auth.Access
if repo != "" {
accessRecords = appendAccessRecords(accessRecords, r.Method, repo)
if fromRepo := r.FormValue("from"); fromRepo != "" {
// mounting a blob from one repository to another requires pull (GET)
// access to the source repository.
accessRecords = appendAccessRecords(accessRecords, http.MethodGet, fromRepo)
}
} else {
// Only allow the name not to be set on the base route.
if app.nameRequired(r) {
// For this to be properly secured, repo must always be set for a
// resource that may make a modification. The only condition under
// which name is not set and we still allow access is when the
// base route is accessed. This section prevents us from making
// that mistake elsewhere in the code, allowing any operation to
// proceed.
if err := errcode.ServeJSON(w, errcode.ErrorCodeUnauthorized); err != nil {
dcontext.GetLogger(context).Errorf("error serving error json: %v (from %v)", err, context.Errors)
}
return fmt.Errorf("forbidden: no repository name")
}
accessRecords = appendCatalogAccessRecord(accessRecords, r)
}
grant, err := app.accessController.Authorized(r.WithContext(context.Context), accessRecords...)
if err != nil {
switch err := err.(type) {
case auth.Challenge:
// Add the appropriate WWW-Auth header
err.SetHeaders(r, w)
if err := errcode.ServeJSON(w, errcode.ErrorCodeUnauthorized.WithDetail(accessRecords)); err != nil {
dcontext.GetLogger(context).Errorf("error serving error json: %v (from %v)", err, context.Errors)
}
default:
// This condition is a potential security problem either in
// the configuration or whatever is backing the access
// controller. Just return a bad request with no information
// to avoid exposure. The request should not proceed.
dcontext.GetLogger(context).Errorf("error checking authorization: %v", err)
w.WriteHeader(http.StatusBadRequest)
}
return err
}
if grant == nil {
return fmt.Errorf("access controller returned neither an access grant nor an error")
}
ctx := withUser(context.Context, grant.User)
ctx = withResources(ctx, grant.Resources)
dcontext.GetLogger(ctx, userNameKey).Info("authorized request")
// TODO(stevvooe): This pattern needs to be cleaned up a bit. One context
// should be replaced by another, rather than replacing the context on a
// mutable object.
context.Context = ctx
return nil
}
// eventBridge returns a bridge for the current request, configured with the
// correct actor and source.
func (app *App) eventBridge(ctx *Context, r *http.Request) notifications.Listener {
actor := notifications.ActorRecord{
Name: getUserName(ctx, r),
}
request := notifications.NewRequestRecord(dcontext.GetRequestID(ctx), r)
return notifications.NewBridge(ctx.urlBuilder, app.events.source, actor, request, app.events.sink, app.Config.Notifications.EventConfig.IncludeReferences)
}
// nameRequired returns true if the route requires a name.
func (app *App) nameRequired(r *http.Request) bool {
route := mux.CurrentRoute(r)
if route == nil {
return true
}
routeName := route.GetName()
return routeName != v2.RouteNameBase && routeName != v2.RouteNameCatalog
}
// apiBase implements a simple yes-man for doing overall checks against the
// api. This can support auth roundtrips to support docker login.
func apiBase(w http.ResponseWriter, r *http.Request) {
const emptyJSON = "{}"
// Provide a simple /v2/ 200 OK response with empty json response.
w.Header().Set("Content-Type", "application/json")
w.Header().Set("Content-Length", fmt.Sprint(len(emptyJSON)))
fmt.Fprint(w, emptyJSON)
}
// appendAccessRecords checks the method and adds the appropriate Access records to the records list.
func appendAccessRecords(records []auth.Access, method string, repo string) []auth.Access {
resource := auth.Resource{
Type: "repository",
Name: repo,
}
switch method {
case http.MethodGet, http.MethodHead:
records = append(records,
auth.Access{
Resource: resource,
Action: "pull",
})
case http.MethodPost, http.MethodPut, http.MethodPatch:
records = append(records,
auth.Access{
Resource: resource,
Action: "pull",
},
auth.Access{
Resource: resource,
Action: "push",
})
case http.MethodDelete:
records = append(records,
auth.Access{
Resource: resource,
Action: "delete",
})
}
return records
}
// Add the access record for the catalog if it's our current route
func appendCatalogAccessRecord(accessRecords []auth.Access, r *http.Request) []auth.Access {
route := mux.CurrentRoute(r)
routeName := route.GetName()
if routeName == v2.RouteNameCatalog {
resource := auth.Resource{
Type: "registry",
Name: "catalog",
}
accessRecords = append(accessRecords,
auth.Access{
Resource: resource,
Action: "*",
})
}
return accessRecords
}
// applyRegistryMiddleware wraps a registry instance with the configured middlewares
func applyRegistryMiddleware(ctx context.Context, registry distribution.Namespace, driver storagedriver.StorageDriver, middlewares []configuration.Middleware) (distribution.Namespace, error) {
for _, mw := range middlewares {
rmw, err := registrymiddleware.Get(ctx, mw.Name, mw.Options, registry, driver)
if err != nil {
return nil, fmt.Errorf("unable to configure registry middleware (%s): %s", mw.Name, err)
}
registry = rmw
}
return registry, nil
}
// applyRepoMiddleware wraps a repository with the configured middlewares
func applyRepoMiddleware(ctx context.Context, repository distribution.Repository, middlewares []configuration.Middleware) (distribution.Repository, error) {
for _, mw := range middlewares {
rmw, err := repositorymiddleware.Get(ctx, mw.Name, mw.Options, repository)
if err != nil {
return nil, err
}
repository = rmw
}
return repository, nil
}
// applyStorageMiddleware wraps a storage driver with the configured middlewares
func applyStorageMiddleware(ctx context.Context, driver storagedriver.StorageDriver, middlewares []configuration.Middleware) (storagedriver.StorageDriver, error) {
for _, mw := range middlewares {
smw, err := storagemiddleware.Get(ctx, mw.Name, mw.Options, driver)
if err != nil {
return nil, fmt.Errorf("unable to configure storage middleware (%s): %v", mw.Name, err)
}
driver = smw
}
return driver, nil
}
// uploadPurgeDefaultConfig provides a default configuration for upload
// purging to be used in the absence of configuration in the
// configuration file
func uploadPurgeDefaultConfig() map[interface{}]interface{} {
config := map[interface{}]interface{}{}
config["enabled"] = true
config["age"] = "168h"
config["interval"] = "24h"
config["dryrun"] = false
return config
}
func badPurgeUploadConfig(reason string) {
panic(fmt.Sprintf("Unable to parse upload purge configuration: %s", reason))
}
// startUploadPurger schedules a goroutine which will periodically
// check upload directories for old files and delete them
func startUploadPurger(ctx context.Context, storageDriver storagedriver.StorageDriver, log dcontext.Logger, config map[interface{}]interface{}) {
if config["enabled"] == false {
return
}
var purgeAgeDuration time.Duration
var err error
purgeAge, ok := config["age"]
if ok {
ageStr, ok := purgeAge.(string)
if !ok {
badPurgeUploadConfig("age is not a string")
}
purgeAgeDuration, err = time.ParseDuration(ageStr)
if err != nil {
badPurgeUploadConfig(fmt.Sprintf("Cannot parse duration: %s", err.Error()))
}
} else {
badPurgeUploadConfig("age missing")
}
var intervalDuration time.Duration
interval, ok := config["interval"]
if ok {
intervalStr, ok := interval.(string)
if !ok {
badPurgeUploadConfig("interval is not a string")
}
intervalDuration, err = time.ParseDuration(intervalStr)
if err != nil {
badPurgeUploadConfig(fmt.Sprintf("Cannot parse interval: %s", err.Error()))
}
} else {
badPurgeUploadConfig("interval missing")
}
var dryRunBool bool
dryRun, ok := config["dryrun"]
if ok {
dryRunBool, ok = dryRun.(bool)
if !ok {
badPurgeUploadConfig("cannot parse dryrun")
}
} else {
badPurgeUploadConfig("dryrun missing")
}
go func() {
randInt, err := rand.Int(rand.Reader, new(big.Int).SetInt64(math.MaxInt64))
if err != nil {
log.Infof("Failed to generate random jitter: %v", err)
// sleep 30min for failure case
randInt = big.NewInt(30)
}
jitter := time.Duration(randInt.Int64()%60) * time.Minute
log.Infof("Starting upload purge in %s", jitter)
time.Sleep(jitter)
for {
storage.PurgeUploads(ctx, storageDriver, time.Now().Add(-purgeAgeDuration), !dryRunBool)
log.Infof("Starting upload purge in %s", intervalDuration)
time.Sleep(intervalDuration)
}
}()
}