ContainerImage.Pinniped/internal/oidc/provider/manager/manager.go

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// Copyright 2020 the Pinniped contributors. All Rights Reserved.
// SPDX-License-Identifier: Apache-2.0
package manager
import (
"net/http"
"strings"
"sync"
"go.pinniped.dev/internal/secret"
"go.pinniped.dev/internal/oidc/dynamiccodec"
corev1client "k8s.io/client-go/kubernetes/typed/core/v1"
"go.pinniped.dev/internal/oidc"
"go.pinniped.dev/internal/oidc/auth"
"go.pinniped.dev/internal/oidc/callback"
"go.pinniped.dev/internal/oidc/csrftoken"
"go.pinniped.dev/internal/oidc/discovery"
"go.pinniped.dev/internal/oidc/jwks"
"go.pinniped.dev/internal/oidc/provider"
"go.pinniped.dev/internal/oidc/token"
"go.pinniped.dev/internal/plog"
"go.pinniped.dev/pkg/oidcclient/nonce"
"go.pinniped.dev/pkg/oidcclient/pkce"
)
// Manager can manage multiple active OIDC providers. It acts as a request router for them.
//
// It is thread-safe.
type Manager struct {
mu sync.RWMutex
providers []*provider.OIDCProvider
providerHandlers map[string]http.Handler // map of all routes for all providers
nextHandler http.Handler // the next handler in a chain, called when this manager didn't know how to handle a request
dynamicJWKSProvider jwks.DynamicJWKSProvider // in-memory cache of per-issuer JWKS data
idpListGetter oidc.IDPListGetter // in-memory cache of upstream IDPs
cache secret.Cache // in-memory cache of cryptographic material
secretsClient corev1client.SecretInterface
}
// NewManager returns an empty Manager.
// nextHandler will be invoked for any requests that could not be handled by this manager's providers.
// dynamicJWKSProvider will be used as an in-memory cache for per-issuer JWKS data.
// idpListGetter will be used as an in-memory cache of currently configured upstream IDPs.
func NewManager(
nextHandler http.Handler,
dynamicJWKSProvider jwks.DynamicJWKSProvider,
idpListGetter oidc.IDPListGetter,
cache secret.Cache,
secretsClient corev1client.SecretInterface,
) *Manager {
return &Manager{
providerHandlers: make(map[string]http.Handler),
nextHandler: nextHandler,
dynamicJWKSProvider: dynamicJWKSProvider,
idpListGetter: idpListGetter,
cache: cache,
secretsClient: secretsClient,
}
}
// SetProviders adds or updates all the given providerHandlers using each provider's issuer string
// as the name of the provider to decide if it is an add or update operation.
//
// It also removes any providerHandlers that were previously added but were not passed in to
// the current invocation.
//
// This method assumes that all of the OIDCProvider arguments have already been validated
// by someone else before they are passed to this method.
func (m *Manager) SetProviders(oidcProviders ...*provider.OIDCProvider) {
m.mu.Lock()
defer m.mu.Unlock()
m.providers = oidcProviders
m.providerHandlers = make(map[string]http.Handler)
var csrfCookieEncoder = dynamiccodec.New(m.cache.GetCSRFCookieEncoderHashKey, m.cache.GetCSRFCookieEncoderBlockKey)
for _, incomingProvider := range oidcProviders {
providerCache := m.cache.GetOIDCProviderCacheFor(incomingProvider.Issuer())
if providerCache == nil { // TODO remove when populated from `Secret` values
providerCache = &secret.OIDCProviderCache{}
providerCache.SetTokenHMACKey([]byte("some secret - must have at least 32 bytes")) // TODO fetch from `Secret`
providerCache.SetStateEncoderHashKey([]byte("fake-state-hash-secret")) // TODO fetch from `Secret`
providerCache.SetStateEncoderBlockKey([]byte("16-bytes-STATE01")) // TODO fetch from `Secret`
m.cache.SetOIDCProviderCacheFor(incomingProvider.Issuer(), providerCache)
}
issuer := incomingProvider.Issuer()
issuerHostWithPath := strings.ToLower(incomingProvider.IssuerHost()) + "/" + incomingProvider.IssuerPath()
oidcTimeouts := oidc.DefaultOIDCTimeoutsConfiguration()
// Use NullStorage for the authorize endpoint because we do not actually want to store anything until
// the upstream callback endpoint is called later.
oauthHelperWithNullStorage := oidc.FositeOauth2Helper(oidc.NullStorage{}, issuer, providerCache.GetTokenHMACKey, nil, oidcTimeouts)
// For all the other endpoints, make another oauth helper with exactly the same settings except use real storage.
oauthHelperWithKubeStorage := oidc.FositeOauth2Helper(oidc.NewKubeStorage(m.secretsClient), issuer, providerCache.GetTokenHMACKey, m.dynamicJWKSProvider, oidcTimeouts)
var upstreamStateEncoder = dynamiccodec.New(providerCache.GetStateEncoderHashKey, providerCache.GetStateEncoderBlockKey)
m.providerHandlers[(issuerHostWithPath + oidc.WellKnownEndpointPath)] = discovery.NewHandler(issuer)
m.providerHandlers[(issuerHostWithPath + oidc.JWKSEndpointPath)] = jwks.NewHandler(issuer, m.dynamicJWKSProvider)
m.providerHandlers[(issuerHostWithPath + oidc.AuthorizationEndpointPath)] = auth.NewHandler(
issuer,
m.idpListGetter,
oauthHelperWithNullStorage,
csrftoken.Generate,
pkce.Generate,
nonce.Generate,
upstreamStateEncoder,
csrfCookieEncoder,
)
m.providerHandlers[(issuerHostWithPath + oidc.CallbackEndpointPath)] = callback.NewHandler(
m.idpListGetter,
oauthHelperWithKubeStorage,
upstreamStateEncoder,
csrfCookieEncoder,
issuer+oidc.CallbackEndpointPath,
)
m.providerHandlers[(issuerHostWithPath + oidc.TokenEndpointPath)] = token.NewHandler(
oauthHelperWithKubeStorage,
)
plog.Debug("oidc provider manager added or updated issuer", "issuer", issuer)
}
}
// ServeHTTP implements the http.Handler interface.
func (m *Manager) ServeHTTP(resp http.ResponseWriter, req *http.Request) {
requestHandler := m.findHandler(req)
plog.Debug(
"oidc provider manager examining request",
"method", req.Method,
"host", req.Host,
"path", req.URL.Path,
"foundMatchingIssuer", requestHandler != nil,
)
if requestHandler == nil {
requestHandler = m.nextHandler // couldn't find an issuer to handle the request
}
requestHandler.ServeHTTP(resp, req)
}
func (m *Manager) findHandler(req *http.Request) http.Handler {
m.mu.RLock()
defer m.mu.RUnlock()
return m.providerHandlers[strings.ToLower(req.Host)+"/"+req.URL.Path]
}