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moby--moby/pkg/authorization/middleware.go

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package authorization
import (
"net/http"
"sync"
"github.com/docker/docker/pkg/plugingetter"
"github.com/sirupsen/logrus"
"golang.org/x/net/context"
)
// Middleware uses a list of plugins to
// handle authorization in the API requests.
type Middleware struct {
mu sync.Mutex
plugins []Plugin
}
// NewMiddleware creates a new Middleware
// with a slice of plugins names.
func NewMiddleware(names []string, pg plugingetter.PluginGetter) *Middleware {
SetPluginGetter(pg)
return &Middleware{
plugins: newPlugins(names),
}
}
func (m *Middleware) getAuthzPlugins() []Plugin {
m.mu.Lock()
defer m.mu.Unlock()
return m.plugins
}
// SetPlugins sets the plugin used for authorization
func (m *Middleware) SetPlugins(names []string) {
m.mu.Lock()
m.plugins = newPlugins(names)
m.mu.Unlock()
}
// RemovePlugin removes a single plugin from this authz middleware chain
func (m *Middleware) RemovePlugin(name string) {
m.mu.Lock()
defer m.mu.Unlock()
plugins := m.plugins[:0]
for _, authPlugin := range m.plugins {
if authPlugin.Name() != name {
plugins = append(plugins, authPlugin)
}
}
m.plugins = plugins
}
// WrapHandler returns a new handler function wrapping the previous one in the request chain.
func (m *Middleware) WrapHandler(handler func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error) func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
return func(ctx context.Context, w http.ResponseWriter, r *http.Request, vars map[string]string) error {
plugins := m.getAuthzPlugins()
if len(plugins) == 0 {
return handler(ctx, w, r, vars)
}
user := ""
userAuthNMethod := ""
// Default authorization using existing TLS connection credentials
// FIXME: Non trivial authorization mechanisms (such as advanced certificate validations, kerberos support
// and ldap) will be extracted using AuthN feature, which is tracked under:
// https://github.com/docker/docker/pull/20883
if r.TLS != nil && len(r.TLS.PeerCertificates) > 0 {
user = r.TLS.PeerCertificates[0].Subject.CommonName
userAuthNMethod = "TLS"
}
authCtx := NewCtx(plugins, user, userAuthNMethod, r.Method, r.RequestURI)
if err := authCtx.AuthZRequest(w, r); err != nil {
logrus.Errorf("AuthZRequest for %s %s returned error: %s", r.Method, r.RequestURI, err)
return err
}
rw := NewResponseModifier(w)
var errD error
if errD = handler(ctx, rw, r, vars); errD != nil {
logrus.Errorf("Handler for %s %s returned error: %s", r.Method, r.RequestURI, errD)
}
// There's a chance that the authCtx.plugins was updated. One of the reasons
// this can happen is when an authzplugin is disabled.
plugins = m.getAuthzPlugins()
if len(plugins) == 0 {
logrus.Debug("There are no authz plugins in the chain")
return nil
}
authCtx.plugins = plugins
if err := authCtx.AuthZResponse(rw, r); errD == nil && err != nil {
logrus.Errorf("AuthZResponse for %s %s returned error: %s", r.Method, r.RequestURI, err)
return err
}
if errD != nil {
return errD
}
return nil
}
}