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"
"github.com/gorilla/securecookie"
"go.pinniped.dev/internal/oidc"
"go.pinniped.dev/internal/oidc/auth"
"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/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 auth.IDPListGetter // in-memory cache of upstream IDPs
}
// 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 auth.IDPListGetter) *Manager {
return &Manager{
providerHandlers: make(map[string]http.Handler),
nextHandler: nextHandler,
dynamicJWKSProvider: dynamicJWKSProvider,
idpListGetter: idpListGetter,
}
}
// 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)
for _, incomingProvider := range oidcProviders {
wellKnownURL := strings.ToLower(incomingProvider.IssuerHost()) + "/" + incomingProvider.IssuerPath() + oidc.WellKnownEndpointPath
m.providerHandlers[wellKnownURL] = discovery.NewHandler(incomingProvider.Issuer())
jwksURL := strings.ToLower(incomingProvider.IssuerHost()) + "/" + incomingProvider.IssuerPath() + oidc.JWKSEndpointPath
m.providerHandlers[jwksURL] = jwks.NewHandler(incomingProvider.Issuer(), m.dynamicJWKSProvider)
// Use NullStorage for the authorize endpoint because we do not actually want to store anything until
// the upstream callback endpoint is called later.
oauthHelper := oidc.FositeOauth2Helper(incomingProvider.Issuer(), oidc.NullStorage{}, []byte("some secret - must have at least 32 bytes")) // TODO replace this secret
// TODO use different codecs for the state and the cookie, because:
// 1. we would like to state to have an embedded expiration date while the cookie does not need that
// 2. we would like each downstream provider to use different secrets for signing/encrypting the upstream state, not share secrets
// 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)
var encoderHashKey = []byte("fake-hash-secret") // TODO replace this secret
var encoderBlockKey = []byte("16-bytes-aaaaaaa") // TODO replace this secret
var encoder = securecookie.New(encoderHashKey, encoderBlockKey)
encoder.SetSerializer(securecookie.JSONEncoder{})
authURL := strings.ToLower(incomingProvider.IssuerHost()) + "/" + incomingProvider.IssuerPath() + oidc.AuthorizationEndpointPath
m.providerHandlers[authURL] = auth.NewHandler(incomingProvider.Issuer(), m.idpListGetter, oauthHelper, csrftoken.Generate, pkce.Generate, nonce.Generate, encoder, encoder)
plog.Debug("oidc provider manager added or updated issuer", "issuer", incomingProvider.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]
}