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