155 lines
6.1 KiB
Go
155 lines
6.1 KiB
Go
// Copyright 2020 the Pinniped contributors. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package manager
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import (
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"net/http"
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"strings"
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"sync"
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"github.com/gorilla/securecookie"
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corev1client "k8s.io/client-go/kubernetes/typed/core/v1"
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"go.pinniped.dev/internal/oidc"
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"go.pinniped.dev/internal/oidc/auth"
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"go.pinniped.dev/internal/oidc/callback"
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"go.pinniped.dev/internal/oidc/csrftoken"
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"go.pinniped.dev/internal/oidc/discovery"
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"go.pinniped.dev/internal/oidc/jwks"
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"go.pinniped.dev/internal/oidc/provider"
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"go.pinniped.dev/internal/oidc/token"
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"go.pinniped.dev/internal/plog"
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"go.pinniped.dev/pkg/oidcclient/nonce"
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"go.pinniped.dev/pkg/oidcclient/pkce"
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)
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// Manager can manage multiple active OIDC providers. It acts as a request router for them.
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//
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// It is thread-safe.
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type Manager struct {
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mu sync.RWMutex
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providers []*provider.OIDCProvider
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providerHandlers map[string]http.Handler // map of all routes for all providers
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nextHandler http.Handler // the next handler in a chain, called when this manager didn't know how to handle a request
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dynamicJWKSProvider jwks.DynamicJWKSProvider // in-memory cache of per-issuer JWKS data
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idpListGetter oidc.IDPListGetter // in-memory cache of upstream IDPs
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secretsClient corev1client.SecretInterface
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}
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// NewManager returns an empty Manager.
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// nextHandler will be invoked for any requests that could not be handled by this manager's providers.
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// dynamicJWKSProvider will be used as an in-memory cache for per-issuer JWKS data.
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// idpListGetter will be used as an in-memory cache of currently configured upstream IDPs.
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func NewManager(
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nextHandler http.Handler,
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dynamicJWKSProvider jwks.DynamicJWKSProvider,
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idpListGetter oidc.IDPListGetter,
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secretsClient corev1client.SecretInterface,
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) *Manager {
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return &Manager{
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providerHandlers: make(map[string]http.Handler),
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nextHandler: nextHandler,
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dynamicJWKSProvider: dynamicJWKSProvider,
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idpListGetter: idpListGetter,
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secretsClient: secretsClient,
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}
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}
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// SetProviders adds or updates all the given providerHandlers using each provider's issuer string
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// as the name of the provider to decide if it is an add or update operation.
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//
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// It also removes any providerHandlers that were previously added but were not passed in to
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// the current invocation.
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//
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// This method assumes that all of the OIDCProvider arguments have already been validated
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// by someone else before they are passed to this method.
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func (m *Manager) SetProviders(oidcProviders ...*provider.OIDCProvider) {
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m.mu.Lock()
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defer m.mu.Unlock()
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m.providers = oidcProviders
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m.providerHandlers = make(map[string]http.Handler)
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for _, incomingProvider := range oidcProviders {
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issuer := incomingProvider.Issuer()
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issuerHostWithPath := strings.ToLower(incomingProvider.IssuerHost()) + "/" + incomingProvider.IssuerPath()
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fositeHMACSecretForThisProvider := []byte("some secret - must have at least 32 bytes") // TODO replace this secret
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// Use NullStorage for the authorize endpoint because we do not actually want to store anything until
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// the upstream callback endpoint is called later.
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oauthHelperWithNullStorage := oidc.FositeOauth2Helper(oidc.NullStorage{}, issuer, fositeHMACSecretForThisProvider, nil)
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// For all the other endpoints, make another oauth helper with exactly the same settings except use real storage.
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oauthHelperWithKubeStorage := oidc.FositeOauth2Helper(oidc.NewKubeStorage(m.secretsClient), issuer, fositeHMACSecretForThisProvider, m.dynamicJWKSProvider)
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// TODO use different codecs for the state and the cookie, because:
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// 1. we would like to state to have an embedded expiration date while the cookie does not need that
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// 2. we would like each downstream provider to use different secrets for signing/encrypting the upstream state, not share secrets
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// 3. we would like *all* downstream providers to use the *same* signing key for the CSRF cookie (which doesn't need to be encrypted) because cookies are sent per-domain and our issuers can share a domain name (but have different paths)
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var encoderHashKey = []byte("fake-hash-secret") // TODO replace this secret
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var encoderBlockKey = []byte("16-bytes-aaaaaaa") // TODO replace this secret
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var upstreamStateEncoder = securecookie.New(encoderHashKey, encoderBlockKey)
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upstreamStateEncoder.SetSerializer(securecookie.JSONEncoder{})
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var csrfCookieEncoder = securecookie.New(encoderHashKey, encoderBlockKey)
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csrfCookieEncoder.SetSerializer(securecookie.JSONEncoder{})
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m.providerHandlers[(issuerHostWithPath + oidc.WellKnownEndpointPath)] = discovery.NewHandler(issuer)
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m.providerHandlers[(issuerHostWithPath + oidc.JWKSEndpointPath)] = jwks.NewHandler(issuer, m.dynamicJWKSProvider)
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m.providerHandlers[(issuerHostWithPath + oidc.AuthorizationEndpointPath)] = auth.NewHandler(
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issuer,
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m.idpListGetter,
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oauthHelperWithNullStorage,
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csrftoken.Generate,
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pkce.Generate,
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nonce.Generate,
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upstreamStateEncoder,
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csrfCookieEncoder,
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)
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m.providerHandlers[(issuerHostWithPath + oidc.CallbackEndpointPath)] = callback.NewHandler(
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m.idpListGetter,
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oauthHelperWithKubeStorage,
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upstreamStateEncoder,
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csrfCookieEncoder,
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issuer+oidc.CallbackEndpointPath,
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)
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m.providerHandlers[(issuerHostWithPath + oidc.TokenEndpointPath)] = token.NewHandler(
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oauthHelperWithKubeStorage,
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)
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plog.Debug("oidc provider manager added or updated issuer", "issuer", issuer)
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}
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}
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// ServeHTTP implements the http.Handler interface.
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func (m *Manager) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
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requestHandler := m.findHandler(req)
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plog.Debug(
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"oidc provider manager examining request",
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"method", req.Method,
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"host", req.Host,
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"path", req.URL.Path,
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"foundMatchingIssuer", requestHandler != nil,
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)
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if requestHandler == nil {
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requestHandler = m.nextHandler // couldn't find an issuer to handle the request
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}
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requestHandler.ServeHTTP(resp, req)
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}
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func (m *Manager) findHandler(req *http.Request) http.Handler {
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m.mu.RLock()
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defer m.mu.RUnlock()
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return m.providerHandlers[strings.ToLower(req.Host)+"/"+req.URL.Path]
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}
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