492 lines
23 KiB
Go
492 lines
23 KiB
Go
// Copyright 2020-2023 the Pinniped contributors. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package supervisorconfig
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import (
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"context"
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"fmt"
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"net/url"
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"strings"
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"time"
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metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
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"k8s.io/apimachinery/pkg/labels"
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"k8s.io/apimachinery/pkg/types"
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"k8s.io/apimachinery/pkg/util/errors"
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"k8s.io/client-go/util/retry"
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"k8s.io/klog/v2"
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"k8s.io/utils/clock"
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configv1alpha1 "go.pinniped.dev/generated/latest/apis/supervisor/config/v1alpha1"
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pinnipedclientset "go.pinniped.dev/generated/latest/client/supervisor/clientset/versioned"
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configinformers "go.pinniped.dev/generated/latest/client/supervisor/informers/externalversions/config/v1alpha1"
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idpinformers "go.pinniped.dev/generated/latest/client/supervisor/informers/externalversions/idp/v1alpha1"
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"go.pinniped.dev/internal/celtransformer"
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pinnipedcontroller "go.pinniped.dev/internal/controller"
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"go.pinniped.dev/internal/controllerlib"
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"go.pinniped.dev/internal/federationdomain/federationdomainproviders"
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"go.pinniped.dev/internal/idtransform"
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"go.pinniped.dev/internal/plog"
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)
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// FederationDomainsSetter can be notified of all known valid providers with its SetIssuer function.
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// If there are no longer any valid issuers, then it can be called with no arguments.
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// Implementations of this type should be thread-safe to support calls from multiple goroutines.
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type FederationDomainsSetter interface {
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SetFederationDomains(federationDomains ...*federationdomainproviders.FederationDomainIssuer)
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}
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type federationDomainWatcherController struct {
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federationDomainsSetter FederationDomainsSetter
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clock clock.Clock
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client pinnipedclientset.Interface
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federationDomainInformer configinformers.FederationDomainInformer
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oidcIdentityProviderInformer idpinformers.OIDCIdentityProviderInformer
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ldapIdentityProviderInformer idpinformers.LDAPIdentityProviderInformer
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activeDirectoryIdentityProviderInformer idpinformers.ActiveDirectoryIdentityProviderInformer
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}
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// NewFederationDomainWatcherController creates a controllerlib.Controller that watches
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// FederationDomain objects and notifies a callback object of the collection of provider configs.
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func NewFederationDomainWatcherController(
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federationDomainsSetter FederationDomainsSetter,
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clock clock.Clock,
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client pinnipedclientset.Interface,
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federationDomainInformer configinformers.FederationDomainInformer,
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oidcIdentityProviderInformer idpinformers.OIDCIdentityProviderInformer,
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ldapIdentityProviderInformer idpinformers.LDAPIdentityProviderInformer,
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activeDirectoryIdentityProviderInformer idpinformers.ActiveDirectoryIdentityProviderInformer,
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withInformer pinnipedcontroller.WithInformerOptionFunc,
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) controllerlib.Controller {
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return controllerlib.New(
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controllerlib.Config{
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Name: "FederationDomainWatcherController",
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Syncer: &federationDomainWatcherController{
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federationDomainsSetter: federationDomainsSetter,
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clock: clock,
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client: client,
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federationDomainInformer: federationDomainInformer,
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oidcIdentityProviderInformer: oidcIdentityProviderInformer,
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ldapIdentityProviderInformer: ldapIdentityProviderInformer,
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activeDirectoryIdentityProviderInformer: activeDirectoryIdentityProviderInformer,
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},
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},
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withInformer(
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federationDomainInformer,
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pinnipedcontroller.MatchAnythingFilter(pinnipedcontroller.SingletonQueue()),
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controllerlib.InformerOption{},
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),
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withInformer(
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oidcIdentityProviderInformer,
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// Since this controller only cares about IDP metadata names and UIDs (immutable fields),
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// we only need to trigger Sync on creates and deletes.
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pinnipedcontroller.MatchAnythingIgnoringUpdatesFilter(pinnipedcontroller.SingletonQueue()),
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controllerlib.InformerOption{},
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),
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withInformer(
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ldapIdentityProviderInformer,
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// Since this controller only cares about IDP metadata names and UIDs (immutable fields),
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// we only need to trigger Sync on creates and deletes.
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pinnipedcontroller.MatchAnythingIgnoringUpdatesFilter(pinnipedcontroller.SingletonQueue()),
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controllerlib.InformerOption{},
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),
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withInformer(
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activeDirectoryIdentityProviderInformer,
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// Since this controller only cares about IDP metadata names and UIDs (immutable fields),
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// we only need to trigger Sync on creates and deletes.
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pinnipedcontroller.MatchAnythingIgnoringUpdatesFilter(pinnipedcontroller.SingletonQueue()),
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controllerlib.InformerOption{},
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),
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)
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}
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// Sync implements controllerlib.Syncer.
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func (c *federationDomainWatcherController) Sync(ctx controllerlib.Context) error { //nolint:funlen,gocyclo
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federationDomains, err := c.federationDomainInformer.Lister().List(labels.Everything())
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if err != nil {
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return err
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}
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// Make a map of issuer strings -> count of how many times we saw that issuer string.
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// This will help us complain when there are duplicate issuer strings.
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// Also make a helper function for forming keys into this map.
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issuerCounts := make(map[string]int)
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issuerURLToIssuerKey := func(issuerURL *url.URL) string {
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return fmt.Sprintf("%s://%s%s", issuerURL.Scheme, strings.ToLower(issuerURL.Host), issuerURL.Path)
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}
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// Make a map of issuer hostnames -> set of unique secret names. This will help us complain when
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// multiple FederationDomains have the same issuer hostname (excluding port) but specify
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// different TLS serving Secrets. Doesn't make sense to have the one address use more than one
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// TLS cert. Ignore ports because SNI information on the incoming requests is not going to include
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// port numbers. Also make a helper function for forming keys into this map.
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uniqueSecretNamesPerIssuerAddress := make(map[string]map[string]bool)
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issuerURLToHostnameKey := lowercaseHostWithoutPort
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for _, federationDomain := range federationDomains {
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issuerURL, err := url.Parse(federationDomain.Spec.Issuer)
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if err != nil {
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continue // Skip url parse errors because they will be validated again below.
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}
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issuerCounts[issuerURLToIssuerKey(issuerURL)]++
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setOfSecretNames := uniqueSecretNamesPerIssuerAddress[issuerURLToHostnameKey(issuerURL)]
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if setOfSecretNames == nil {
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setOfSecretNames = make(map[string]bool)
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uniqueSecretNamesPerIssuerAddress[issuerURLToHostnameKey(issuerURL)] = setOfSecretNames
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}
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if federationDomain.Spec.TLS != nil {
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setOfSecretNames[federationDomain.Spec.TLS.SecretName] = true
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}
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}
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var errs []error
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federationDomainIssuers := make([]*federationdomainproviders.FederationDomainIssuer, 0)
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for _, federationDomain := range federationDomains {
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issuerURL, urlParseErr := url.Parse(federationDomain.Spec.Issuer)
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// Skip url parse errors because they will be validated below.
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if urlParseErr == nil {
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if issuerCount := issuerCounts[issuerURLToIssuerKey(issuerURL)]; issuerCount > 1 {
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if err := c.updateStatus(
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ctx.Context,
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federationDomain.Namespace,
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federationDomain.Name,
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configv1alpha1.DuplicateFederationDomainStatusCondition,
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"Duplicate issuer: "+federationDomain.Spec.Issuer,
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); err != nil {
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errs = append(errs, fmt.Errorf("could not update status: %w", err))
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}
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continue
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}
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}
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// Skip url parse errors because they will be validated below.
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if urlParseErr == nil && len(uniqueSecretNamesPerIssuerAddress[issuerURLToHostnameKey(issuerURL)]) > 1 {
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if err := c.updateStatus(
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ctx.Context,
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federationDomain.Namespace,
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federationDomain.Name,
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configv1alpha1.SameIssuerHostMustUseSameSecretFederationDomainStatusCondition,
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"Issuers with the same DNS hostname (address not including port) must use the same secretName: "+issuerURLToHostnameKey(issuerURL),
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); err != nil {
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errs = append(errs, fmt.Errorf("could not update status: %w", err))
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}
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continue
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}
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// TODO: Move all this identity provider stuff into helper functions. This is just a sketch of how the code would
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// work in the sense that this is not doing error handling, is not validating everything that it should, and
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// is not updating the status of the FederationDomain with anything related to these identity providers.
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// This code may crash on invalid inputs since it is not handling any errors. However, when given valid inputs,
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// this correctly implements the multiple IDPs features.
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// Create the list of IDPs for this FederationDomain.
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// Don't worry if the IDP CRs themselves is phase=Ready because those which are not ready will not be loaded
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// into the provider cache, so they cannot actually be used to authenticate.
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federationDomainIdentityProviders := []*federationdomainproviders.FederationDomainIdentityProvider{}
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var defaultFederationDomainIdentityProvider *federationdomainproviders.FederationDomainIdentityProvider
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if len(federationDomain.Spec.IdentityProviders) == 0 {
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// When the FederationDomain does not list any IDPs, then we might be in backwards compatibility mode.
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oidcIdentityProviders, _ := c.oidcIdentityProviderInformer.Lister().List(labels.Everything())
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ldapIdentityProviders, _ := c.ldapIdentityProviderInformer.Lister().List(labels.Everything())
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activeDirectoryIdentityProviders, _ := c.activeDirectoryIdentityProviderInformer.Lister().List(labels.Everything())
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// TODO handle err return value for each of the above three lines
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// Check if that there is exactly one IDP defined in the Supervisor namespace of any IDP CRD type.
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idpCRsCount := len(oidcIdentityProviders) + len(ldapIdentityProviders) + len(activeDirectoryIdentityProviders)
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if idpCRsCount == 1 {
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// If so, default that IDP's DisplayName to be the same as its resource Name.
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defaultFederationDomainIdentityProvider = &federationdomainproviders.FederationDomainIdentityProvider{}
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switch {
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case len(oidcIdentityProviders) == 1:
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defaultFederationDomainIdentityProvider.DisplayName = oidcIdentityProviders[0].Name
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defaultFederationDomainIdentityProvider.UID = oidcIdentityProviders[0].UID
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case len(ldapIdentityProviders) == 1:
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defaultFederationDomainIdentityProvider.DisplayName = ldapIdentityProviders[0].Name
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defaultFederationDomainIdentityProvider.UID = ldapIdentityProviders[0].UID
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case len(activeDirectoryIdentityProviders) == 1:
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defaultFederationDomainIdentityProvider.DisplayName = activeDirectoryIdentityProviders[0].Name
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defaultFederationDomainIdentityProvider.UID = activeDirectoryIdentityProviders[0].UID
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}
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// Backwards compatibility mode always uses an empty identity transformation pipline since no
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// transformations are defined on the FederationDomain.
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defaultFederationDomainIdentityProvider.Transforms = idtransform.NewTransformationPipeline()
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plog.Warning("detected FederationDomain identity provider backwards compatibility mode: using the one existing identity provider for authentication",
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"federationDomain", federationDomain.Name)
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} else {
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// There are no IDP CRs or there is more than one IDP CR. Either way, we are not in the backwards
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// compatibility mode because there is not exactly one IDP CR in the namespace, despite the fact that no
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// IDPs are listed on the FederationDomain. Create a FederationDomain which has no IDPs and therefore
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// cannot actually be used to log in, but still serves endpoints.
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// TODO: Write something into the FederationDomain's status to explain what's happening and how to fix it.
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plog.Warning("FederationDomain has no identity providers listed and there is not exactly one identity provider defined in the namespace: authentication disabled",
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"federationDomain", federationDomain.Name,
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"namespace", federationDomain.Namespace,
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"identityProvidersCustomResourcesCount", idpCRsCount,
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)
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}
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}
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// If there is an explicit list of IDPs on the FederationDomain, then process the list.
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celTransformer, _ := celtransformer.NewCELTransformer(time.Second) // TODO: what is a good duration limit here?
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// TODO: handle err
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for _, idp := range federationDomain.Spec.IdentityProviders {
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var idpResourceUID types.UID
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var idpResourceName string
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// TODO: Validate that all displayNames are unique within this FederationDomain's spec's list of identity providers.
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// TODO: Validate that idp.ObjectRef.APIGroup is the expected APIGroup for IDP CRs "idp.supervisor.pinniped.dev"
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// Validate that each objectRef resolves to an existing IDP. It does not matter if the IDP itself
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// is phase=Ready, because it will not be loaded into the cache if not ready. For each objectRef
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// that does not resolve, put an error on the FederationDomain status.
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switch idp.ObjectRef.Kind {
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case "LDAPIdentityProvider":
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ldapIDP, _ := c.ldapIdentityProviderInformer.Lister().LDAPIdentityProviders(federationDomain.Namespace).Get(idp.ObjectRef.Name)
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// TODO: handle notfound err and also unexpected errors
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idpResourceName = ldapIDP.Name
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idpResourceUID = ldapIDP.UID
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case "ActiveDirectoryIdentityProvider":
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adIDP, _ := c.activeDirectoryIdentityProviderInformer.Lister().ActiveDirectoryIdentityProviders(federationDomain.Namespace).Get(idp.ObjectRef.Name)
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// TODO: handle notfound err and also unexpected errors
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idpResourceName = adIDP.Name
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idpResourceUID = adIDP.UID
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case "OIDCIdentityProvider":
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oidcIDP, _ := c.oidcIdentityProviderInformer.Lister().OIDCIdentityProviders(federationDomain.Namespace).Get(idp.ObjectRef.Name)
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// TODO: handle notfound err and also unexpected errors
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idpResourceName = oidcIDP.Name
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idpResourceUID = oidcIDP.UID
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default:
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// TODO: handle bad user input
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}
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plog.Debug("resolved identity provider object reference",
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"kind", idp.ObjectRef.Kind,
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"name", idp.ObjectRef.Name,
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"foundResourceName", idpResourceName,
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"foundResourceUID", idpResourceUID,
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)
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// Prepare the transformations.
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pipeline := idtransform.NewTransformationPipeline()
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consts := &celtransformer.TransformationConstants{
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StringConstants: map[string]string{},
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StringListConstants: map[string][]string{},
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}
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// Read all the declared constants.
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for _, c := range idp.Transforms.Constants {
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switch c.Type {
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case "string":
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consts.StringConstants[c.Name] = c.StringValue
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case "stringList":
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consts.StringListConstants[c.Name] = c.StringListValue
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default:
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// TODO: this shouldn't really happen since the CRD validates it, but handle it as an error
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}
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}
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// Compile all the expressions and add them to the pipeline.
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for idx, e := range idp.Transforms.Expressions {
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var rawTransform celtransformer.CELTransformation
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switch e.Type {
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case "username/v1":
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rawTransform = &celtransformer.UsernameTransformation{Expression: e.Expression}
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case "groups/v1":
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rawTransform = &celtransformer.GroupsTransformation{Expression: e.Expression}
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case "policy/v1":
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rawTransform = &celtransformer.AllowAuthenticationPolicy{
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Expression: e.Expression,
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RejectedAuthenticationMessage: e.Message,
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}
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default:
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// TODO: this shouldn't really happen since the CRD validates it, but handle it as an error
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}
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compiledTransform, err := celTransformer.CompileTransformation(rawTransform, consts)
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if err != nil {
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// TODO: handle compile err
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plog.Error("error compiling identity transformation", err,
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"federationDomain", federationDomain.Name,
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"idpDisplayName", idp.DisplayName,
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"transformationIndex", idx,
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"transformationType", e.Type,
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"transformationExpression", e.Expression,
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)
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}
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pipeline.AppendTransformation(compiledTransform)
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plog.Debug("successfully compiled identity transformation expression",
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"type", e.Type,
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"expr", e.Expression,
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"policyMessage", e.Message,
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)
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}
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// Run all the provided transform examples. If any fail, put errors on the FederationDomain status.
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for idx, e := range idp.Transforms.Examples {
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// TODO: use a real context param below
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result, _ := pipeline.Evaluate(context.TODO(), e.Username, e.Groups)
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// TODO: handle err
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resultWasAuthRejected := !result.AuthenticationAllowed
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if e.Expects.Rejected && !resultWasAuthRejected { //nolint:gocritic,nestif
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// TODO: handle this failed example
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plog.Warning("FederationDomain identity provider transformations example failed: expected authentication to be rejected but it was not",
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"federationDomain", federationDomain.Name,
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"idpDisplayName", idp.DisplayName,
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"exampleIndex", idx,
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"expectedRejected", e.Expects.Rejected,
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"actualRejectedResult", resultWasAuthRejected,
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"expectedMessage", e.Expects.Message,
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"actualMessageResult", result.RejectedAuthenticationMessage,
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)
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} else if !e.Expects.Rejected && resultWasAuthRejected {
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// TODO: handle this failed example
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plog.Warning("FederationDomain identity provider transformations example failed: expected authentication not to be rejected but it was rejected",
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"federationDomain", federationDomain.Name,
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"idpDisplayName", idp.DisplayName,
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"exampleIndex", idx,
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"expectedRejected", e.Expects.Rejected,
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"actualRejectedResult", resultWasAuthRejected,
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"expectedMessage", e.Expects.Message,
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"actualMessageResult", result.RejectedAuthenticationMessage,
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)
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} else if e.Expects.Rejected && resultWasAuthRejected && e.Expects.Message != result.RejectedAuthenticationMessage {
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// TODO: when expected message is blank, then treat it like it expects the default message
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// TODO: handle this failed example
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plog.Warning("FederationDomain identity provider transformations example failed: expected a different authentication rejection message",
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"federationDomain", federationDomain.Name,
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"idpDisplayName", idp.DisplayName,
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"exampleIndex", idx,
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"expectedRejected", e.Expects.Rejected,
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"actualRejectedResult", resultWasAuthRejected,
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"expectedMessage", e.Expects.Message,
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"actualMessageResult", result.RejectedAuthenticationMessage,
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)
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} else if result.AuthenticationAllowed {
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// In the case where the user expected the auth to be allowed and it was allowed, then compare
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// the expected username and group names to the actual username and group names.
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// TODO: when both of these fail, put both errors onto the status (not just the first one)
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if e.Expects.Username != result.Username {
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// TODO: handle this failed example
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plog.Warning("FederationDomain identity provider transformations example failed: expected a different transformed username",
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"federationDomain", federationDomain.Name,
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"idpDisplayName", idp.DisplayName,
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"exampleIndex", idx,
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"expectedUsername", e.Expects.Username,
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"actualUsernameResult", result.Username,
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)
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}
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if !stringSlicesEqual(e.Expects.Groups, result.Groups) {
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// TODO: Do we need to make this insensitive to ordering, or should the transformations evaluator be changed to always return sorted group names at the end of the pipeline?
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// TODO: What happens if the user did not write any group expectation? Treat it like expecting any empty list of groups?
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// TODO: handle this failed example
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plog.Warning("FederationDomain identity provider transformations example failed: expected a different transformed groups list",
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"federationDomain", federationDomain.Name,
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"idpDisplayName", idp.DisplayName,
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"exampleIndex", idx,
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"expectedGroups", e.Expects.Groups,
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"actualGroupsResult", result.Groups,
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)
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}
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}
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}
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// For each valid IDP (unique displayName, valid objectRef + valid transforms), add it to the list.
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federationDomainIdentityProviders = append(federationDomainIdentityProviders, &federationdomainproviders.FederationDomainIdentityProvider{
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DisplayName: idp.DisplayName,
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UID: idpResourceUID,
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Transforms: pipeline,
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})
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plog.Debug("loaded FederationDomain identity provider",
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"federationDomain", federationDomain.Name,
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"identityProviderDisplayName", idp.DisplayName,
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"identityProviderResourceUID", idpResourceUID,
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)
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}
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// Now that we have the list of IDPs for this FederationDomain, create the issuer.
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var federationDomainIssuer *federationdomainproviders.FederationDomainIssuer
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err = nil
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if defaultFederationDomainIdentityProvider != nil {
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// This is the constructor for the backwards compatibility mode.
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federationDomainIssuer, err = federationdomainproviders.NewFederationDomainIssuerWithDefaultIDP(federationDomain.Spec.Issuer, defaultFederationDomainIdentityProvider)
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} else {
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// This is the constructor for any other case, including when there is an empty list of IDPs.
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federationDomainIssuer, err = federationdomainproviders.NewFederationDomainIssuer(federationDomain.Spec.Issuer, federationDomainIdentityProviders)
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}
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if err != nil {
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// Note that the FederationDomainIssuer constructors validate the Issuer URL.
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if err := c.updateStatus(
|
|
ctx.Context,
|
|
federationDomain.Namespace,
|
|
federationDomain.Name,
|
|
configv1alpha1.InvalidFederationDomainStatusCondition,
|
|
"Invalid: "+err.Error(),
|
|
); err != nil {
|
|
errs = append(errs, fmt.Errorf("could not update status: %w", err))
|
|
}
|
|
continue
|
|
}
|
|
|
|
if err := c.updateStatus(
|
|
ctx.Context,
|
|
federationDomain.Namespace,
|
|
federationDomain.Name,
|
|
configv1alpha1.SuccessFederationDomainStatusCondition,
|
|
"Provider successfully created",
|
|
); err != nil {
|
|
errs = append(errs, fmt.Errorf("could not update status: %w", err))
|
|
continue
|
|
}
|
|
|
|
federationDomainIssuers = append(federationDomainIssuers, federationDomainIssuer)
|
|
}
|
|
|
|
c.federationDomainsSetter.SetFederationDomains(federationDomainIssuers...)
|
|
|
|
return errors.NewAggregate(errs)
|
|
}
|
|
|
|
func stringSlicesEqual(a []string, b []string) bool {
|
|
if len(a) != len(b) {
|
|
return false
|
|
}
|
|
for i, itemFromA := range a {
|
|
if b[i] != itemFromA {
|
|
return false
|
|
}
|
|
}
|
|
return true
|
|
}
|
|
|
|
func (c *federationDomainWatcherController) updateStatus(
|
|
ctx context.Context,
|
|
namespace, name string,
|
|
status configv1alpha1.FederationDomainStatusCondition,
|
|
message string,
|
|
) error {
|
|
return retry.RetryOnConflict(retry.DefaultRetry, func() error {
|
|
federationDomain, err := c.client.ConfigV1alpha1().FederationDomains(namespace).Get(ctx, name, metav1.GetOptions{})
|
|
if err != nil {
|
|
return fmt.Errorf("get failed: %w", err)
|
|
}
|
|
|
|
if federationDomain.Status.Status == status && federationDomain.Status.Message == message {
|
|
return nil
|
|
}
|
|
|
|
plog.Debug(
|
|
"attempting status update",
|
|
"federationdomain",
|
|
klog.KRef(namespace, name),
|
|
"status",
|
|
status,
|
|
"message",
|
|
message,
|
|
)
|
|
federationDomain.Status.Status = status
|
|
federationDomain.Status.Message = message
|
|
federationDomain.Status.LastUpdateTime = timePtr(metav1.NewTime(c.clock.Now()))
|
|
_, err = c.client.ConfigV1alpha1().FederationDomains(namespace).UpdateStatus(ctx, federationDomain, metav1.UpdateOptions{})
|
|
return err
|
|
})
|
|
}
|
|
|
|
func timePtr(t metav1.Time) *metav1.Time { return &t }
|