Merge pull request #877 from vmware-tanzu/upstream-ldap-refresh

Upstream ldap refresh

internal/authenticators/authenticators.go

@@ -7,7 +7,7 @@ package authenticators
 import (
 	"context"
 
-	"k8s.io/apiserver/pkg/authentication/authenticator"
+	"k8s.io/apiserver/pkg/authentication/user"
 )
 
 // This interface is similar to the k8s token authenticator, but works with username/passwords instead
@@ -31,5 +31,10 @@ import (
 // See k8s.io/apiserver/pkg/authentication/authenticator/interfaces.go for the token authenticator
 // interface, as well as the Response type.
 type UserAuthenticator interface {
-	AuthenticateUser(ctx context.Context, username, password string) (*authenticator.Response, bool, error)
+	AuthenticateUser(ctx context.Context, username, password string) (*Response, bool, error)
+}
+
+type Response struct {
+	User user.Info
+	DN   string
 }

internal/fositestorage/authorizationcode/authorizationcode.go

@@ -328,14 +328,22 @@ const ExpectedAuthorizeCodeSessionJSONFromFuzzing = `{
 				"providerType": "闣ʬ橳(ý綃ʃʚƟ覣k眐4Ĉt",
 				"oidc": {
 					"upstreamRefreshToken": "嵽痊w©Ź榨Q|ôɵt毇妬"
+				},
+				"ldap": {
+					"userDN": "6鉢緋uƴŤȱʀļÂ?墖\u003cƬb獭潜Ʃ饾"
+				},
+				"activedirectory": {
+					"userDN": "|鬌R蜚蠣麹概÷驣7Ʀ澉1æɽ誮rʨ鷞"
 				}
 			}
 		},
 		"requestedAudience": [
-			"6鉢緋uƴŤȱʀļÂ?墖\u003cƬb獭潜Ʃ饾"
+			"ŚB碠k9"
 		],
 		"grantedAudience": [
-			"|鬌R蜚蠣麹概÷驣7Ʀ澉1æɽ誮rʨ鷞"
+			"ʘ赱",
+			"ď逳鞪?3)藵睋邔\u0026Ű惫蜀Ģ¡圔",
+			"墀jMʥ"
 		]
 	},
 	"version": "2"

internal/oidc/auth/auth_handler.go

@@ -15,9 +15,9 @@ import (
 	"github.com/ory/fosite/token/jwt"
 	"github.com/pkg/errors"
 	"golang.org/x/oauth2"
-	"k8s.io/apiserver/pkg/authentication/authenticator"
 
 	supervisoroidc "go.pinniped.dev/generated/latest/apis/supervisor/oidc"
+	"go.pinniped.dev/internal/authenticators"
 	"go.pinniped.dev/internal/httputil/httperr"
 	"go.pinniped.dev/internal/httputil/securityheader"
 	"go.pinniped.dev/internal/oidc"
@@ -112,6 +112,7 @@ func handleAuthRequestForLDAPUpstream(
 	subject := downstreamSubjectFromUpstreamLDAP(ldapUpstream, authenticateResponse)
 	username = authenticateResponse.User.GetName()
 	groups := authenticateResponse.User.GetGroups()
+	dn := authenticateResponse.DN
 
 	customSessionData := &psession.CustomSessionData{
 		ProviderUID:  ldapUpstream.GetResourceUID(),
@@ -119,6 +120,17 @@ func handleAuthRequestForLDAPUpstream(
 		ProviderType: idpType,
 	}
 
+	if idpType == psession.ProviderTypeLDAP {
+		customSessionData.LDAP = &psession.LDAPSessionData{
+			UserDN: dn,
+		}
+	}
+	if idpType == psession.ProviderTypeActiveDirectory {
+		customSessionData.ActiveDirectory = &psession.ActiveDirectorySessionData{
+			UserDN: dn,
+		}
+	}
+
 	return makeDownstreamSessionAndReturnAuthcodeRedirect(r, w,
 		oauthHelper, authorizeRequester, subject, username, groups, customSessionData)
 }
@@ -470,10 +482,7 @@ func addCSRFSetCookieHeader(w http.ResponseWriter, csrfValue csrftoken.CSRFToken
 	return nil
 }
 
-func downstreamSubjectFromUpstreamLDAP(ldapUpstream provider.UpstreamLDAPIdentityProviderI, authenticateResponse *authenticator.Response) string {
+func downstreamSubjectFromUpstreamLDAP(ldapUpstream provider.UpstreamLDAPIdentityProviderI, authenticateResponse *authenticators.Response) string {
 	ldapURL := *ldapUpstream.GetURL()
-	q := ldapURL.Query()
+	return downstreamsession.DownstreamLDAPSubject(authenticateResponse.User.GetUID(), ldapURL)
-	q.Set(oidc.IDTokenSubjectClaim, authenticateResponse.User.GetUID())
-	ldapURL.RawQuery = q.Encode()
-	return ldapURL.String()
 }

internal/oidc/auth/auth_handler_test.go

@@ -19,12 +19,12 @@ import (
 	"github.com/ory/fosite"
 	"github.com/stretchr/testify/require"
 	"golang.org/x/oauth2"
-	"k8s.io/apiserver/pkg/authentication/authenticator"
 	"k8s.io/apiserver/pkg/authentication/user"
 	"k8s.io/client-go/kubernetes/fake"
 	v1 "k8s.io/client-go/kubernetes/typed/core/v1"
 	"k8s.io/utils/pointer"
 
+	"go.pinniped.dev/internal/authenticators"
 	"go.pinniped.dev/internal/here"
 	"go.pinniped.dev/internal/oidc"
 	"go.pinniped.dev/internal/oidc/csrftoken"
@@ -267,22 +267,24 @@ func TestAuthorizationEndpoint(t *testing.T) {
 	happyLDAPUsernameFromAuthenticator := "some-mapped-ldap-username"
 	happyLDAPPassword := "some-ldap-password" //nolint:gosec
 	happyLDAPUID := "some-ldap-uid"
+	happyLDAPUserDN := "cn=foo,dn=bar"
 	happyLDAPGroups := []string{"group1", "group2", "group3"}
 
 	parsedUpstreamLDAPURL, err := url.Parse(upstreamLDAPURL)
 	require.NoError(t, err)
 
-	ldapAuthenticateFunc := func(ctx context.Context, username, password string) (*authenticator.Response, bool, error) {
+	ldapAuthenticateFunc := func(ctx context.Context, username, password string) (*authenticators.Response, bool, error) {
 		if username == "" || password == "" {
 			return nil, false, fmt.Errorf("should not have passed empty username or password to the authenticator")
 		}
 		if username == happyLDAPUsername && password == happyLDAPPassword {
-			return &authenticator.Response{
+			return &authenticators.Response{
 				User: &user.DefaultInfo{
 					Name:   happyLDAPUsernameFromAuthenticator,
 					UID:    happyLDAPUID,
 					Groups: happyLDAPGroups,
 				},
+				DN: happyLDAPUserDN,
 			}, true, nil
 		}
 		return nil, false, nil
@@ -305,7 +307,7 @@ func TestAuthorizationEndpoint(t *testing.T) {
 	erroringUpstreamLDAPIdentityProvider := oidctestutil.TestUpstreamLDAPIdentityProvider{
 		Name:        ldapUpstreamName,
 		ResourceUID: ldapUpstreamResourceUID,
-		AuthenticateFunc: func(ctx context.Context, username, password string) (*authenticator.Response, bool, error) {
+		AuthenticateFunc: func(ctx context.Context, username, password string) (*authenticators.Response, bool, error) {
 			return nil, false, fmt.Errorf("some ldap upstream auth error")
 		},
 	}
@@ -438,6 +440,10 @@ func TestAuthorizationEndpoint(t *testing.T) {
 		ProviderName: activeDirectoryUpstreamName,
 		ProviderType: psession.ProviderTypeActiveDirectory,
 		OIDC:         nil,
+		LDAP:         nil,
+		ActiveDirectory: &psession.ActiveDirectorySessionData{
+			UserDN: happyLDAPUserDN,
+		},
 	}
 
 	expectedHappyLDAPUpstreamCustomSession := &psession.CustomSessionData{
@@ -445,6 +451,10 @@ func TestAuthorizationEndpoint(t *testing.T) {
 		ProviderName: ldapUpstreamName,
 		ProviderType: psession.ProviderTypeLDAP,
 		OIDC:         nil,
+		LDAP: &psession.LDAPSessionData{
+			UserDN: happyLDAPUserDN,
+		},
+		ActiveDirectory: nil,
 	}
 
 	expectedHappyOIDCPasswordGrantCustomSession := &psession.CustomSessionData{

internal/oidc/downstreamsession/downstream_session.go

@@ -169,6 +169,13 @@ func extractStringClaimValue(claimName string, upstreamIDPName string, idTokenCl
 	return valueAsString, nil
 }
 
+func DownstreamLDAPSubject(uid string, ldapURL url.URL) string {
+	q := ldapURL.Query()
+	q.Set(oidc.IDTokenSubjectClaim, uid)
+	ldapURL.RawQuery = q.Encode()
+	return ldapURL.String()
+}
+
 func downstreamSubjectFromUpstreamOIDC(upstreamIssuerAsString string, upstreamSubject string) string {
 	return fmt.Sprintf("%s?%s=%s", upstreamIssuerAsString, oidc.IDTokenSubjectClaim, url.QueryEscape(upstreamSubject))
 }

internal/oidc/provider/dynamic_upstream_idp_provider.go

@@ -88,6 +88,9 @@ type UpstreamLDAPIdentityProviderI interface {
 
 	// UserAuthenticator adds an interface method for performing user authentication against the upstream LDAP provider.
 	authenticators.UserAuthenticator
+
+	// PerformRefresh performs a refresh against the upstream LDAP identity provider
+	PerformRefresh(ctx context.Context, userDN, expectedUsername, expectedSubject string) error
 }
 
 type DynamicUpstreamIDPProvider interface {

internal/oidc/token/token_handler.go

@@ -75,6 +75,12 @@ func NewHandler(
 
 func upstreamRefresh(ctx context.Context, accessRequest fosite.AccessRequester, providerCache oidc.UpstreamIdentityProvidersLister) error {
 	session := accessRequest.GetSession().(*psession.PinnipedSession)
+	downstreamUsername, err := getDownstreamUsernameFromPinnipedSession(session)
+	if err != nil {
+		return err
+	}
+	downstreamSubject := session.Fosite.Claims.Subject
+
 	customSessionData := session.Custom
 	if customSessionData == nil {
 		return errorsx.WithStack(errMissingUpstreamSessionInternalError)
@@ -89,14 +95,12 @@ func upstreamRefresh(ctx context.Context, accessRequest fosite.AccessRequester,
 	case psession.ProviderTypeOIDC:
 		return upstreamOIDCRefresh(ctx, customSessionData, providerCache)
 	case psession.ProviderTypeLDAP:
-		// upstream refresh not yet implemented for LDAP, so do nothing
+		return upstreamLDAPRefresh(ctx, customSessionData, providerCache, downstreamUsername, downstreamSubject)
 	case psession.ProviderTypeActiveDirectory:
-		// upstream refresh not yet implemented for AD, so do nothing
+		return upstreamLDAPRefresh(ctx, customSessionData, providerCache, downstreamUsername, downstreamSubject)
 	default:
 		return errorsx.WithStack(errMissingUpstreamSessionInternalError)
 	}
-
-	return nil
 }
 
 func upstreamOIDCRefresh(ctx context.Context, s *psession.CustomSessionData, providerCache oidc.UpstreamIdentityProvidersLister) error {
@@ -114,9 +118,9 @@ func upstreamOIDCRefresh(ctx context.Context, s *psession.CustomSessionData, pro
 
 	refreshedTokens, err := p.PerformRefresh(ctx, s.OIDC.UpstreamRefreshToken)
 	if err != nil {
-		return errorsx.WithStack(errUpstreamRefreshError.WithHintf(
+		return errorsx.WithStack(errUpstreamRefreshError.WithHint(
-			"Upstream refresh failed using provider %q of type %q.",
+			"Upstream refresh failed.",
-			s.ProviderName, s.ProviderType).WithWrap(err))
+		).WithWrap(err).WithDebugf("provider name: %q, provider type: %q", s.ProviderName, s.ProviderType))
 	}
 
 	// Upstream refresh may or may not return a new ID token. From the spec:
@@ -129,8 +133,7 @@ func upstreamOIDCRefresh(ctx context.Context, s *psession.CustomSessionData, pro
 		_, err = p.ValidateToken(ctx, refreshedTokens, "")
 		if err != nil {
 			return errorsx.WithStack(errUpstreamRefreshError.WithHintf(
-				"Upstream refresh returned an invalid ID token using provider %q of type %q.",
+				"Upstream refresh returned an invalid ID token.").WithWrap(err).WithDebugf("provider name: %q, provider type: %q", s.ProviderName, s.ProviderType))
-				s.ProviderName, s.ProviderType).WithWrap(err))
 		}
 	} else {
 		plog.Debug("upstream refresh request did not return a new ID token",
@@ -163,5 +166,72 @@ func findOIDCProviderByNameAndValidateUID(
 		}
 	}
 	return nil, errorsx.WithStack(errUpstreamRefreshError.
-		WithHintf("Provider %q of type %q from upstream session data was not found.", s.ProviderName, s.ProviderType))
+		WithHint("Provider from upstream session data was not found.").WithDebugf("provider name: %q, provider type: %q", s.ProviderName, s.ProviderType))
+}
+
+func upstreamLDAPRefresh(ctx context.Context, s *psession.CustomSessionData, providerCache oidc.UpstreamIdentityProvidersLister, username string, subject string) error {
+	// if you have neither a valid ldap session config nor a valid active directory session config
+	validLDAP := s.ProviderType == psession.ProviderTypeLDAP && s.LDAP != nil && s.LDAP.UserDN != ""
+	validAD := s.ProviderType == psession.ProviderTypeActiveDirectory && s.ActiveDirectory != nil && s.ActiveDirectory.UserDN != ""
+	if !(validLDAP || validAD) {
+		return errorsx.WithStack(errMissingUpstreamSessionInternalError)
+	}
+
+	// get ldap/ad provider out of cache
+	p, dn, err := findLDAPProviderByNameAndValidateUID(s, providerCache)
+	if err != nil {
+		return err
+	}
+	// run PerformRefresh
+	err = p.PerformRefresh(ctx, dn, username, subject)
+	if err != nil {
+		return errorsx.WithStack(errUpstreamRefreshError.WithHint(
+			"Upstream refresh failed.").WithWrap(err).WithDebugf("provider name: %q, provider type: %q", s.ProviderName, s.ProviderType))
+	}
+
+	return nil
+}
+
+func findLDAPProviderByNameAndValidateUID(
+	s *psession.CustomSessionData,
+	providerCache oidc.UpstreamIdentityProvidersLister,
+) (provider.UpstreamLDAPIdentityProviderI, string, error) {
+	var providers []provider.UpstreamLDAPIdentityProviderI
+	var dn string
+	if s.ProviderType == psession.ProviderTypeLDAP {
+		providers = providerCache.GetLDAPIdentityProviders()
+		dn = s.LDAP.UserDN
+	} else if s.ProviderType == psession.ProviderTypeActiveDirectory {
+		providers = providerCache.GetActiveDirectoryIdentityProviders()
+		dn = s.ActiveDirectory.UserDN
+	}
+
+	for _, p := range providers {
+		if p.GetName() == s.ProviderName {
+			if p.GetResourceUID() != s.ProviderUID {
+				return nil, "", errorsx.WithStack(errUpstreamRefreshError.WithHint(
+					"Provider from upstream session data has changed its resource UID since authentication.").WithDebugf("provider name: %q, provider type: %q", s.ProviderName, s.ProviderType))
+			}
+			return p, dn, nil
+		}
+	}
+
+	return nil, "", errorsx.WithStack(errUpstreamRefreshError.
+		WithHint("Provider from upstream session data was not found.").WithDebugf("provider name: %q, provider type: %q", s.ProviderName, s.ProviderType))
+}
+
+func getDownstreamUsernameFromPinnipedSession(session *psession.PinnipedSession) (string, error) {
+	extra := session.Fosite.Claims.Extra
+	if extra == nil {
+		return "", errorsx.WithStack(errMissingUpstreamSessionInternalError)
+	}
+	downstreamUsernameInterface := extra["username"]
+	if downstreamUsernameInterface == nil {
+		return "", errorsx.WithStack(errMissingUpstreamSessionInternalError)
+	}
+	downstreamUsername, ok := downstreamUsernameInterface.(string)
+	if !ok || len(downstreamUsername) == 0 {
+		return "", errorsx.WithStack(errMissingUpstreamSessionInternalError)
+	}
+	return downstreamUsername, nil
 }

internal/oidc/token/token_handler_test.go

@@ -232,7 +232,7 @@ type tokenEndpointResponseExpectedValues struct {
 	wantErrorResponseBody             string
 	wantRequestedScopes               []string
 	wantGrantedScopes                 []string
-	wantUpstreamOIDCRefreshCall       *expectedUpstreamRefresh
+	wantUpstreamRefreshCall           *expectedUpstreamRefresh
 	wantUpstreamOIDCValidateTokenCall *expectedUpstreamValidateTokens
 	wantCustomSessionDataStored       *psession.CustomSessionData
 }
@@ -879,8 +879,20 @@ func TestRefreshGrant(t *testing.T) {
 		oidcUpstreamInitialRefreshToken   = "initial-upstream-refresh-token"
 		oidcUpstreamRefreshedIDToken      = "fake-refreshed-id-token"
 		oidcUpstreamRefreshedRefreshToken = "fake-refreshed-refresh-token"
+
+		ldapUpstreamName        = "some-ldap-idp"
+		ldapUpstreamResourceUID = "ldap-resource-uid"
+		ldapUpstreamType        = "ldap"
+		ldapUpstreamDN          = "some-ldap-user-dn"
+
+		activeDirectoryUpstreamName        = "some-ad-idp"
+		activeDirectoryUpstreamResourceUID = "ad-resource-uid"
+		activeDirectoryUpstreamType        = "activedirectory"
+		activeDirectoryUpstreamDN          = "some-ad-user-dn"
 	)
 
+	ldapUpstreamURL, _ := url.Parse("some-url")
+
 	// The below values are funcs so every test can have its own copy of the objects, to avoid data races
 	// in these parallel tests.
 
@@ -907,7 +919,7 @@ func TestRefreshGrant(t *testing.T) {
 		return sessionData
 	}
 
-	happyUpstreamRefreshCall := func() *expectedUpstreamRefresh {
+	happyOIDCUpstreamRefreshCall := func() *expectedUpstreamRefresh {
 		return &expectedUpstreamRefresh{
 			performedByUpstreamName: oidcUpstreamName,
 			args: &oidctestutil.PerformRefreshArgs{
@@ -917,6 +929,30 @@ func TestRefreshGrant(t *testing.T) {
 		}
 	}
 
+	happyLDAPUpstreamRefreshCall := func() *expectedUpstreamRefresh {
+		return &expectedUpstreamRefresh{
+			performedByUpstreamName: ldapUpstreamName,
+			args: &oidctestutil.PerformRefreshArgs{
+				Ctx:              nil,
+				DN:               ldapUpstreamDN,
+				ExpectedSubject:  goodSubject,
+				ExpectedUsername: goodUsername,
+			},
+		}
+	}
+
+	happyActiveDirectoryUpstreamRefreshCall := func() *expectedUpstreamRefresh {
+		return &expectedUpstreamRefresh{
+			performedByUpstreamName: activeDirectoryUpstreamName,
+			args: &oidctestutil.PerformRefreshArgs{
+				Ctx:              nil,
+				DN:               activeDirectoryUpstreamDN,
+				ExpectedSubject:  goodSubject,
+				ExpectedUsername: goodUsername,
+			},
+		}
+	}
+
 	happyUpstreamValidateTokenCall := func(expectedTokens *oauth2.Token) *expectedUpstreamValidateTokens {
 		return &expectedUpstreamValidateTokens{
 			performedByUpstreamName: oidcUpstreamName,
@@ -944,7 +980,7 @@ func TestRefreshGrant(t *testing.T) {
 		// same as the same values as the authcode exchange case.
 		want := happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(wantCustomSessionDataStored)
 		// Should always try to perform an upstream refresh.
-		want.wantUpstreamOIDCRefreshCall = happyUpstreamRefreshCall()
+		want.wantUpstreamRefreshCall = happyOIDCUpstreamRefreshCall()
 		// Should only try to ValidateToken when there was an id token returned by the upstream refresh.
 		if expectToValidateToken != nil {
 			want.wantUpstreamOIDCValidateTokenCall = happyUpstreamValidateTokenCall(expectToValidateToken)
@@ -952,6 +988,18 @@ func TestRefreshGrant(t *testing.T) {
 		return want
 	}
 
+	happyRefreshTokenResponseForLDAP := func(wantCustomSessionDataStored *psession.CustomSessionData) tokenEndpointResponseExpectedValues {
+		want := happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(wantCustomSessionDataStored)
+		want.wantUpstreamRefreshCall = happyLDAPUpstreamRefreshCall()
+		return want
+	}
+
+	happyRefreshTokenResponseForActiveDirectory := func(wantCustomSessionDataStored *psession.CustomSessionData) tokenEndpointResponseExpectedValues {
+		want := happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(wantCustomSessionDataStored)
+		want.wantUpstreamRefreshCall = happyActiveDirectoryUpstreamRefreshCall()
+		return want
+	}
+
 	refreshedUpstreamTokensWithRefreshTokenWithoutIDToken := func() *oauth2.Token {
 		return &oauth2.Token{
 			AccessToken:  "fake-refreshed-access-token",
@@ -972,11 +1020,28 @@ func TestRefreshGrant(t *testing.T) {
 		return tokens
 	}
 
+	happyActiveDirectoryCustomSessionData := &psession.CustomSessionData{
+		ProviderUID:  activeDirectoryUpstreamResourceUID,
+		ProviderName: activeDirectoryUpstreamName,
+		ProviderType: activeDirectoryUpstreamType,
+		ActiveDirectory: &psession.ActiveDirectorySessionData{
+			UserDN: activeDirectoryUpstreamDN,
+		},
+	}
+	happyLDAPCustomSessionData := &psession.CustomSessionData{
+		ProviderUID:  ldapUpstreamResourceUID,
+		ProviderName: ldapUpstreamName,
+		ProviderType: ldapUpstreamType,
+		LDAP: &psession.LDAPSessionData{
+			UserDN: ldapUpstreamDN,
+		},
+	}
 	tests := []struct {
-		name             string
+		name                      string
-		idps             *oidctestutil.UpstreamIDPListerBuilder
+		idps                      *oidctestutil.UpstreamIDPListerBuilder
-		authcodeExchange authcodeExchangeInputs
+		authcodeExchange          authcodeExchangeInputs
-		refreshRequest   refreshRequestInputs
+		refreshRequest            refreshRequestInputs
+		modifyRefreshTokenStorage func(t *testing.T, oauthStore *oidc.KubeStorage, refreshToken string)
 	}{
 		{
 			name: "happy path refresh grant with openid scope granted (id token returned)",
@@ -1015,7 +1080,7 @@ func TestRefreshGrant(t *testing.T) {
 					wantSuccessBodyFields:             []string{"refresh_token", "access_token", "token_type", "expires_in", "scope"},
 					wantRequestedScopes:               []string{"offline_access"},
 					wantGrantedScopes:                 []string{"offline_access"},
-					wantUpstreamOIDCRefreshCall:       happyUpstreamRefreshCall(),
+					wantUpstreamRefreshCall:           happyOIDCUpstreamRefreshCall(),
 					wantUpstreamOIDCValidateTokenCall: happyUpstreamValidateTokenCall(refreshedUpstreamTokensWithIDAndRefreshTokens()),
 					wantCustomSessionDataStored:       upstreamOIDCCustomSessionDataWithNewRefreshToken(oidcUpstreamRefreshedRefreshToken),
 				},
@@ -1096,7 +1161,7 @@ func TestRefreshGrant(t *testing.T) {
 					wantSuccessBodyFields:             []string{"id_token", "refresh_token", "access_token", "token_type", "expires_in", "scope"},
 					wantRequestedScopes:               []string{"openid", "offline_access", "pinniped:request-audience"},
 					wantGrantedScopes:                 []string{"openid", "offline_access", "pinniped:request-audience"},
-					wantUpstreamOIDCRefreshCall:       happyUpstreamRefreshCall(),
+					wantUpstreamRefreshCall:           happyOIDCUpstreamRefreshCall(),
 					wantUpstreamOIDCValidateTokenCall: happyUpstreamValidateTokenCall(refreshedUpstreamTokensWithIDAndRefreshTokens()),
 					wantCustomSessionDataStored:       upstreamOIDCCustomSessionDataWithNewRefreshToken(oidcUpstreamRefreshedRefreshToken),
 				},
@@ -1400,7 +1465,7 @@ func TestRefreshGrant(t *testing.T) {
 					wantErrorResponseBody: here.Doc(`
 						{
 							"error":             "error",
-							"error_description": "Error during upstream refresh. Provider 'this-name-will-not-be-found' of type 'oidc' from upstream session data was not found."
+							"error_description": "Error during upstream refresh. Provider from upstream session data was not found."
 						}
 					`),
 				},
@@ -1449,12 +1514,12 @@ func TestRefreshGrant(t *testing.T) {
 			},
 			refreshRequest: refreshRequestInputs{
 				want: tokenEndpointResponseExpectedValues{
-					wantUpstreamOIDCRefreshCall: happyUpstreamRefreshCall(),
+					wantUpstreamRefreshCall: happyOIDCUpstreamRefreshCall(),
-					wantStatus:                  http.StatusUnauthorized,
+					wantStatus:              http.StatusUnauthorized,
 					wantErrorResponseBody: here.Doc(`
 						{
 							"error":             "error",
-							"error_description": "Error during upstream refresh. Upstream refresh failed using provider 'some-oidc-idp' of type 'oidc'."
+							"error_description": "Error during upstream refresh. Upstream refresh failed."
 						}
 					`),
 				},
@@ -1474,13 +1539,520 @@ func TestRefreshGrant(t *testing.T) {
 			},
 			refreshRequest: refreshRequestInputs{
 				want: tokenEndpointResponseExpectedValues{
-					wantUpstreamOIDCRefreshCall:       happyUpstreamRefreshCall(),
+					wantUpstreamRefreshCall:           happyOIDCUpstreamRefreshCall(),
 					wantUpstreamOIDCValidateTokenCall: happyUpstreamValidateTokenCall(refreshedUpstreamTokensWithIDAndRefreshTokens()),
 					wantStatus:                        http.StatusUnauthorized,
 					wantErrorResponseBody: here.Doc(`
 						{
 							"error":             "error",
-							"error_description": "Error during upstream refresh. Upstream refresh returned an invalid ID token using provider 'some-oidc-idp' of type 'oidc'."
+							"error_description": "Error during upstream refresh. Upstream refresh returned an invalid ID token."
+						}
+					`),
+				},
+			},
+		},
+		{
+			name: "upstream ldap refresh happy path",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder().WithLDAP(&oidctestutil.TestUpstreamLDAPIdentityProvider{
+				Name:        ldapUpstreamName,
+				ResourceUID: ldapUpstreamResourceUID,
+				URL:         ldapUpstreamURL,
+			}),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: happyLDAPCustomSessionData,
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					happyLDAPCustomSessionData,
+				),
+			},
+			refreshRequest: refreshRequestInputs{
+				want: happyRefreshTokenResponseForLDAP(
+					happyLDAPCustomSessionData,
+				),
+			},
+		},
+		{
+			name: "upstream active directory refresh happy path",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder().WithActiveDirectory(&oidctestutil.TestUpstreamLDAPIdentityProvider{
+				Name:        activeDirectoryUpstreamName,
+				ResourceUID: activeDirectoryUpstreamResourceUID,
+				URL:         ldapUpstreamURL,
+			}),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: happyActiveDirectoryCustomSessionData,
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					happyActiveDirectoryCustomSessionData,
+				),
+			},
+			refreshRequest: refreshRequestInputs{
+				want: happyRefreshTokenResponseForActiveDirectory(
+					happyActiveDirectoryCustomSessionData,
+				),
+			},
+		},
+		{
+			name: "upstream ldap refresh when the LDAP session data is nil",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder().WithLDAP(&oidctestutil.TestUpstreamLDAPIdentityProvider{
+				Name:        ldapUpstreamName,
+				ResourceUID: ldapUpstreamResourceUID,
+				URL:         ldapUpstreamURL,
+			}),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: &psession.CustomSessionData{
+					ProviderUID:  ldapUpstreamResourceUID,
+					ProviderName: ldapUpstreamName,
+					ProviderType: ldapUpstreamType,
+					LDAP:         nil,
+				},
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					&psession.CustomSessionData{
+						ProviderUID:  ldapUpstreamResourceUID,
+						ProviderName: ldapUpstreamName,
+						ProviderType: ldapUpstreamType,
+						LDAP:         nil,
+					},
+				),
+			},
+			refreshRequest: refreshRequestInputs{
+				want: tokenEndpointResponseExpectedValues{
+					wantStatus: http.StatusInternalServerError,
+					wantErrorResponseBody: here.Doc(`
+						{
+							"error":             "error",
+							"error_description": "There was an internal server error. Required upstream data not found in session."
+						}
+					`),
+				},
+			},
+		},
+		{
+			name: "upstream active directory refresh when the ad session data is nil",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder().WithLDAP(&oidctestutil.TestUpstreamLDAPIdentityProvider{
+				Name:        activeDirectoryUpstreamName,
+				ResourceUID: activeDirectoryUpstreamResourceUID,
+				URL:         ldapUpstreamURL,
+			}),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: &psession.CustomSessionData{
+					ProviderUID:     activeDirectoryUpstreamResourceUID,
+					ProviderName:    activeDirectoryUpstreamName,
+					ProviderType:    activeDirectoryUpstreamType,
+					ActiveDirectory: nil,
+				},
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					&psession.CustomSessionData{
+						ProviderUID:     activeDirectoryUpstreamResourceUID,
+						ProviderName:    activeDirectoryUpstreamName,
+						ProviderType:    activeDirectoryUpstreamType,
+						ActiveDirectory: nil,
+					},
+				),
+			},
+			refreshRequest: refreshRequestInputs{
+				want: tokenEndpointResponseExpectedValues{
+					wantStatus: http.StatusInternalServerError,
+					wantErrorResponseBody: here.Doc(`
+						{
+							"error":             "error",
+							"error_description": "There was an internal server error. Required upstream data not found in session."
+						}
+					`),
+				},
+			},
+		},
+		{
+			name: "upstream ldap refresh when the LDAP session data does not contain dn",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder().WithLDAP(&oidctestutil.TestUpstreamLDAPIdentityProvider{
+				Name:        ldapUpstreamName,
+				ResourceUID: ldapUpstreamResourceUID,
+				URL:         ldapUpstreamURL,
+			}),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: &psession.CustomSessionData{
+					ProviderUID:  ldapUpstreamResourceUID,
+					ProviderName: ldapUpstreamName,
+					ProviderType: ldapUpstreamType,
+					LDAP: &psession.LDAPSessionData{
+						UserDN: "",
+					},
+				},
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					&psession.CustomSessionData{
+						ProviderUID:  ldapUpstreamResourceUID,
+						ProviderName: ldapUpstreamName,
+						ProviderType: ldapUpstreamType,
+						LDAP: &psession.LDAPSessionData{
+							UserDN: "",
+						},
+					},
+				),
+			},
+			refreshRequest: refreshRequestInputs{
+				want: tokenEndpointResponseExpectedValues{
+					wantStatus: http.StatusInternalServerError,
+					wantErrorResponseBody: here.Doc(`
+						{
+							"error":             "error",
+							"error_description": "There was an internal server error. Required upstream data not found in session."
+						}
+					`),
+				},
+			},
+		},
+		{
+			name: "upstream active directory refresh when the active directory session data does not contain dn",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder().WithActiveDirectory(&oidctestutil.TestUpstreamLDAPIdentityProvider{
+				Name:        activeDirectoryUpstreamName,
+				ResourceUID: activeDirectoryUpstreamResourceUID,
+				URL:         ldapUpstreamURL,
+			}),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: &psession.CustomSessionData{
+					ProviderUID:  ldapUpstreamResourceUID,
+					ProviderName: ldapUpstreamName,
+					ProviderType: ldapUpstreamType,
+					ActiveDirectory: &psession.ActiveDirectorySessionData{
+						UserDN: "",
+					},
+				},
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					&psession.CustomSessionData{
+						ProviderUID:  ldapUpstreamResourceUID,
+						ProviderName: ldapUpstreamName,
+						ProviderType: ldapUpstreamType,
+						ActiveDirectory: &psession.ActiveDirectorySessionData{
+							UserDN: "",
+						},
+					},
+				),
+			},
+			refreshRequest: refreshRequestInputs{
+				want: tokenEndpointResponseExpectedValues{
+					wantStatus: http.StatusInternalServerError,
+					wantErrorResponseBody: here.Doc(`
+						{
+							"error":             "error",
+							"error_description": "There was an internal server error. Required upstream data not found in session."
+						}
+					`),
+				},
+			},
+		},
+		{
+			name: "upstream ldap refresh returns an error",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder().WithLDAP(&oidctestutil.TestUpstreamLDAPIdentityProvider{
+				Name:              ldapUpstreamName,
+				ResourceUID:       ldapUpstreamResourceUID,
+				URL:               ldapUpstreamURL,
+				PerformRefreshErr: errors.New("Some error performing upstream refresh"),
+			}),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: happyLDAPCustomSessionData,
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					happyLDAPCustomSessionData,
+				),
+			},
+			refreshRequest: refreshRequestInputs{
+				want: tokenEndpointResponseExpectedValues{
+					wantUpstreamRefreshCall: happyLDAPUpstreamRefreshCall(),
+					wantStatus:              http.StatusUnauthorized,
+					wantErrorResponseBody: here.Doc(`
+						{
+							"error":             "error",
+							"error_description": "Error during upstream refresh. Upstream refresh failed."
+						}
+					`),
+				},
+			},
+		},
+		{
+			name: "upstream active directory refresh returns an error",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder().WithActiveDirectory(&oidctestutil.TestUpstreamLDAPIdentityProvider{
+				Name:              activeDirectoryUpstreamName,
+				ResourceUID:       activeDirectoryUpstreamResourceUID,
+				URL:               ldapUpstreamURL,
+				PerformRefreshErr: errors.New("Some error performing upstream refresh"),
+			}),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: happyActiveDirectoryCustomSessionData,
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					happyActiveDirectoryCustomSessionData,
+				),
+			},
+			refreshRequest: refreshRequestInputs{
+				want: tokenEndpointResponseExpectedValues{
+					wantUpstreamRefreshCall: happyActiveDirectoryUpstreamRefreshCall(),
+					wantStatus:              http.StatusUnauthorized,
+					wantErrorResponseBody: here.Doc(`
+						{
+							"error":             "error",
+							"error_description": "Error during upstream refresh. Upstream refresh failed."
+						}
+					`),
+				},
+			},
+		},
+		{
+			name: "upstream ldap idp not found",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder(),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: happyLDAPCustomSessionData,
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					happyLDAPCustomSessionData,
+				),
+			},
+			refreshRequest: refreshRequestInputs{
+				want: tokenEndpointResponseExpectedValues{
+					wantStatus: http.StatusUnauthorized,
+					wantErrorResponseBody: here.Doc(`
+						{
+							"error":             "error",
+							"error_description": "Error during upstream refresh. Provider from upstream session data was not found."
+						}
+					`),
+				},
+			},
+		},
+		{
+			name: "upstream active directory idp not found",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder(),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: happyActiveDirectoryCustomSessionData,
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					happyActiveDirectoryCustomSessionData,
+				),
+			},
+			refreshRequest: refreshRequestInputs{
+				want: tokenEndpointResponseExpectedValues{
+					wantStatus: http.StatusUnauthorized,
+					wantErrorResponseBody: here.Doc(`
+						{
+							"error":             "error",
+							"error_description": "Error during upstream refresh. Provider from upstream session data was not found."
+						}
+					`),
+				},
+			},
+		},
+		{
+			name: "fosite session is empty",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder().WithLDAP(&oidctestutil.TestUpstreamLDAPIdentityProvider{
+				Name:        ldapUpstreamName,
+				ResourceUID: ldapUpstreamResourceUID,
+				URL:         ldapUpstreamURL,
+			}),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: happyLDAPCustomSessionData,
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					happyLDAPCustomSessionData,
+				),
+			},
+			modifyRefreshTokenStorage: func(t *testing.T, oauthStore *oidc.KubeStorage, refreshToken string) {
+				refreshTokenSignature := getFositeDataSignature(t, refreshToken)
+				firstRequester, err := oauthStore.GetRefreshTokenSession(context.Background(), refreshTokenSignature, nil)
+				require.NoError(t, err)
+				session := firstRequester.GetSession().(*psession.PinnipedSession)
+				session.Fosite = &openid.DefaultSession{}
+				err = oauthStore.DeleteRefreshTokenSession(context.Background(), refreshTokenSignature)
+				require.NoError(t, err)
+				err = oauthStore.CreateRefreshTokenSession(context.Background(), refreshTokenSignature, firstRequester)
+				require.NoError(t, err)
+			},
+			refreshRequest: refreshRequestInputs{
+				want: tokenEndpointResponseExpectedValues{
+					wantStatus: http.StatusInternalServerError,
+					wantErrorResponseBody: here.Doc(`
+						{
+							"error":             "error",
+							"error_description": "There was an internal server error. Required upstream data not found in session."
+						}
+					`),
+				},
+			},
+		},
+		{
+			name: "username not found in extra field",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder().WithLDAP(&oidctestutil.TestUpstreamLDAPIdentityProvider{
+				Name:        ldapUpstreamName,
+				ResourceUID: ldapUpstreamResourceUID,
+				URL:         ldapUpstreamURL,
+			}),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: happyLDAPCustomSessionData,
+				//fositeSessionData: &openid.DefaultSession{},
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					happyLDAPCustomSessionData,
+				),
+			},
+			modifyRefreshTokenStorage: func(t *testing.T, oauthStore *oidc.KubeStorage, refreshToken string) {
+				refreshTokenSignature := getFositeDataSignature(t, refreshToken)
+				firstRequester, err := oauthStore.GetRefreshTokenSession(context.Background(), refreshTokenSignature, nil)
+				require.NoError(t, err)
+				session := firstRequester.GetSession().(*psession.PinnipedSession)
+				session.Fosite = &openid.DefaultSession{
+					Claims: &jwt.IDTokenClaims{
+						Extra: map[string]interface{}{},
+					},
+				}
+				err = oauthStore.DeleteRefreshTokenSession(context.Background(), refreshTokenSignature)
+				require.NoError(t, err)
+				err = oauthStore.CreateRefreshTokenSession(context.Background(), refreshTokenSignature, firstRequester)
+				require.NoError(t, err)
+			},
+			refreshRequest: refreshRequestInputs{
+				want: tokenEndpointResponseExpectedValues{
+					wantStatus: http.StatusInternalServerError,
+					wantErrorResponseBody: here.Doc(`
+						{
+							"error":             "error",
+							"error_description": "There was an internal server error. Required upstream data not found in session."
+						}
+					`),
+				},
+			},
+		},
+		{
+			name: "username in extra is not a string",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder().WithLDAP(&oidctestutil.TestUpstreamLDAPIdentityProvider{
+				Name:        ldapUpstreamName,
+				ResourceUID: ldapUpstreamResourceUID,
+				URL:         ldapUpstreamURL,
+			}),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: happyLDAPCustomSessionData,
+				//fositeSessionData: &openid.DefaultSession{},
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					happyLDAPCustomSessionData,
+				),
+			},
+			modifyRefreshTokenStorage: func(t *testing.T, oauthStore *oidc.KubeStorage, refreshToken string) {
+				refreshTokenSignature := getFositeDataSignature(t, refreshToken)
+				firstRequester, err := oauthStore.GetRefreshTokenSession(context.Background(), refreshTokenSignature, nil)
+				require.NoError(t, err)
+				session := firstRequester.GetSession().(*psession.PinnipedSession)
+				session.Fosite = &openid.DefaultSession{
+					Claims: &jwt.IDTokenClaims{
+						Extra: map[string]interface{}{"username": 123},
+					},
+				}
+				err = oauthStore.DeleteRefreshTokenSession(context.Background(), refreshTokenSignature)
+				require.NoError(t, err)
+				err = oauthStore.CreateRefreshTokenSession(context.Background(), refreshTokenSignature, firstRequester)
+				require.NoError(t, err)
+			},
+			refreshRequest: refreshRequestInputs{
+				want: tokenEndpointResponseExpectedValues{
+					wantStatus: http.StatusInternalServerError,
+					wantErrorResponseBody: here.Doc(`
+						{
+							"error":             "error",
+							"error_description": "There was an internal server error. Required upstream data not found in session."
+						}
+					`),
+				},
+			},
+		},
+		{
+			name: "username in extra is an empty string",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder().WithLDAP(&oidctestutil.TestUpstreamLDAPIdentityProvider{
+				Name:        ldapUpstreamName,
+				ResourceUID: ldapUpstreamResourceUID,
+				URL:         ldapUpstreamURL,
+			}),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: happyLDAPCustomSessionData,
+				//fositeSessionData: &openid.DefaultSession{},
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					happyLDAPCustomSessionData,
+				),
+			},
+			modifyRefreshTokenStorage: func(t *testing.T, oauthStore *oidc.KubeStorage, refreshToken string) {
+				refreshTokenSignature := getFositeDataSignature(t, refreshToken)
+				firstRequester, err := oauthStore.GetRefreshTokenSession(context.Background(), refreshTokenSignature, nil)
+				require.NoError(t, err)
+				session := firstRequester.GetSession().(*psession.PinnipedSession)
+				session.Fosite = &openid.DefaultSession{
+					Claims: &jwt.IDTokenClaims{
+						Extra: map[string]interface{}{"username": ""},
+					},
+				}
+				err = oauthStore.DeleteRefreshTokenSession(context.Background(), refreshTokenSignature)
+				require.NoError(t, err)
+				err = oauthStore.CreateRefreshTokenSession(context.Background(), refreshTokenSignature, firstRequester)
+				require.NoError(t, err)
+			},
+			refreshRequest: refreshRequestInputs{
+				want: tokenEndpointResponseExpectedValues{
+					wantStatus: http.StatusInternalServerError,
+					wantErrorResponseBody: here.Doc(`
+						{
+							"error":             "error",
+							"error_description": "There was an internal server error. Required upstream data not found in session."
+						}
+					`),
+				},
+			},
+		},
+		{
+			name: "when the ldap provider in the session storage is found but has the wrong resource UID during the refresh request",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder().WithLDAP(&oidctestutil.TestUpstreamLDAPIdentityProvider{
+				Name:        ldapUpstreamName,
+				ResourceUID: "the-wrong-uid",
+				URL:         ldapUpstreamURL,
+			}),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: happyLDAPCustomSessionData,
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					happyLDAPCustomSessionData,
+				),
+			},
+			refreshRequest: refreshRequestInputs{
+				want: tokenEndpointResponseExpectedValues{
+					wantStatus: http.StatusUnauthorized,
+					wantErrorResponseBody: here.Doc(`
+						{
+							"error":             "error",
+							"error_description": "Error during upstream refresh. Provider from upstream session data has changed its resource UID since authentication."
+						}
+					`),
+				},
+			},
+		},
+		{
+			name: "when the active directory provider in the session storage is found but has the wrong resource UID during the refresh request",
+			idps: oidctestutil.NewUpstreamIDPListerBuilder().WithActiveDirectory(&oidctestutil.TestUpstreamLDAPIdentityProvider{
+				Name:        activeDirectoryUpstreamName,
+				ResourceUID: "the-wrong-uid",
+				URL:         ldapUpstreamURL,
+			}),
+			authcodeExchange: authcodeExchangeInputs{
+				modifyAuthRequest: func(r *http.Request) { r.Form.Set("scope", "openid offline_access") },
+				customSessionData: happyActiveDirectoryCustomSessionData,
+				want: happyAuthcodeExchangeTokenResponseForOpenIDAndOfflineAccess(
+					happyActiveDirectoryCustomSessionData,
+				),
+			},
+			refreshRequest: refreshRequestInputs{
+				want: tokenEndpointResponseExpectedValues{
+					wantStatus: http.StatusUnauthorized,
+					wantErrorResponseBody: here.Doc(`
+						{
+							"error":             "error",
+							"error_description": "Error during upstream refresh. Provider from upstream session data has changed its resource UID since authentication."
 						}
 					`),
 				},
@@ -1493,6 +2065,8 @@ func TestRefreshGrant(t *testing.T) {
 			t.Parallel()
 
 			// First exchange the authcode for tokens, including a refresh token.
+			// its actually fine to use this function even when simulating ldap (which uses a different flow) because it's
+			// just populating a secret in storage.
 			subject, rsp, authCode, jwtSigningKey, secrets, oauthStore := exchangeAuthcodeForTokens(t, test.authcodeExchange, test.idps.Build())
 			var parsedAuthcodeExchangeResponseBody map[string]interface{}
 			require.NoError(t, json.Unmarshal(rsp.Body.Bytes(), &parsedAuthcodeExchangeResponseBody))
@@ -1511,6 +2085,10 @@ func TestRefreshGrant(t *testing.T) {
 			// Send the refresh token back and preform a refresh.
 			firstRefreshToken := parsedAuthcodeExchangeResponseBody["refresh_token"].(string)
 			require.NotEmpty(t, firstRefreshToken)
+
+			if test.modifyRefreshTokenStorage != nil {
+				test.modifyRefreshTokenStorage(t, oauthStore, firstRefreshToken)
+			}
 			reqContext := context.WithValue(context.Background(), struct{ name string }{name: "test"}, "request-context")
 			req := httptest.NewRequest("POST", "/path/shouldn't/matter",
 				happyRefreshRequestBody(firstRefreshToken).ReadCloser()).WithContext(reqContext)
@@ -1525,11 +2103,11 @@ func TestRefreshGrant(t *testing.T) {
 			t.Logf("second response body: %q", refreshResponse.Body.String())
 
 			// Test that we did or did not make a call to the upstream OIDC provider interface to perform a token refresh.
-			if test.refreshRequest.want.wantUpstreamOIDCRefreshCall != nil {
+			if test.refreshRequest.want.wantUpstreamRefreshCall != nil {
-				test.refreshRequest.want.wantUpstreamOIDCRefreshCall.args.Ctx = reqContext
+				test.refreshRequest.want.wantUpstreamRefreshCall.args.Ctx = reqContext
 				test.idps.RequireExactlyOneCallToPerformRefresh(t,
-					test.refreshRequest.want.wantUpstreamOIDCRefreshCall.performedByUpstreamName,
+					test.refreshRequest.want.wantUpstreamRefreshCall.performedByUpstreamName,
-					test.refreshRequest.want.wantUpstreamOIDCRefreshCall.args,
+					test.refreshRequest.want.wantUpstreamRefreshCall.args,
 				)
 			} else {
 				test.idps.RequireExactlyZeroCallsToPerformRefresh(t)

internal/psession/pinniped_session.go

@@ -45,6 +45,10 @@ type CustomSessionData struct {
 
 	// Only used when ProviderType == "oidc".
 	OIDC *OIDCSessionData `json:"oidc,omitempty"`
+
+	LDAP *LDAPSessionData `json:"ldap,omitempty"`
+
+	ActiveDirectory *ActiveDirectorySessionData `json:"activedirectory,omitempty"`
 }
 
 type ProviderType string
@@ -60,6 +64,16 @@ type OIDCSessionData struct {
 	UpstreamRefreshToken string `json:"upstreamRefreshToken"`
 }
 
+// LDAPSessionData is the additional data needed by Pinniped when the upstream IDP is an LDAP provider.
+type LDAPSessionData struct {
+	UserDN string `json:"userDN"`
+}
+
+// ActiveDirectorySessionData is the additional data needed by Pinniped when the upstream IDP is an Active Directory provider.
+type ActiveDirectorySessionData struct {
+	UserDN string `json:"userDN"`
+}
+
 // NewPinnipedSession returns a new empty session.
 func NewPinnipedSession() *PinnipedSession {
 	return &PinnipedSession{

internal/testutil/oidctestutil/oidctestutil.go

@@ -21,10 +21,10 @@ import (
 	"gopkg.in/square/go-jose.v2"
 	"k8s.io/apimachinery/pkg/labels"
 	"k8s.io/apimachinery/pkg/types"
-	"k8s.io/apiserver/pkg/authentication/authenticator"
 	"k8s.io/client-go/kubernetes/fake"
 	v1 "k8s.io/client-go/kubernetes/typed/core/v1"
 
+	"go.pinniped.dev/internal/authenticators"
 	"go.pinniped.dev/internal/crud"
 	"go.pinniped.dev/internal/fositestorage/authorizationcode"
 	"go.pinniped.dev/internal/fositestorage/openidconnect"
@@ -61,8 +61,11 @@ type PasswordCredentialsGrantAndValidateTokensArgs struct {
 // PerformRefreshArgs is used to spy on calls to
 // TestUpstreamOIDCIdentityProvider.PerformRefreshFunc().
 type PerformRefreshArgs struct {
-	Ctx          context.Context
+	Ctx              context.Context
-	RefreshToken string
+	RefreshToken     string
+	DN               string
+	ExpectedUsername string
+	ExpectedSubject  string
 }
 
 // ValidateTokenArgs is used to spy on calls to
@@ -74,10 +77,13 @@ type ValidateTokenArgs struct {
 }
 
 type TestUpstreamLDAPIdentityProvider struct {
-	Name             string
+	Name                    string
-	ResourceUID      types.UID
+	ResourceUID             types.UID
-	URL              *url.URL
+	URL                     *url.URL
-	AuthenticateFunc func(ctx context.Context, username, password string) (*authenticator.Response, bool, error)
+	AuthenticateFunc        func(ctx context.Context, username, password string) (*authenticators.Response, bool, error)
+	performRefreshCallCount int
+	performRefreshArgs      []*PerformRefreshArgs
+	PerformRefreshErr       error
 }
 
 var _ provider.UpstreamLDAPIdentityProviderI = &TestUpstreamLDAPIdentityProvider{}
@@ -90,7 +96,7 @@ func (u *TestUpstreamLDAPIdentityProvider) GetName() string {
 	return u.Name
 }
 
-func (u *TestUpstreamLDAPIdentityProvider) AuthenticateUser(ctx context.Context, username, password string) (*authenticator.Response, bool, error) {
+func (u *TestUpstreamLDAPIdentityProvider) AuthenticateUser(ctx context.Context, username, password string) (*authenticators.Response, bool, error) {
 	return u.AuthenticateFunc(ctx, username, password)
 }
 
@@ -98,6 +104,34 @@ func (u *TestUpstreamLDAPIdentityProvider) GetURL() *url.URL {
 	return u.URL
 }
 
+func (u *TestUpstreamLDAPIdentityProvider) PerformRefresh(ctx context.Context, userDN, expectedUsername, expectedSubject string) error {
+	if u.performRefreshArgs == nil {
+		u.performRefreshArgs = make([]*PerformRefreshArgs, 0)
+	}
+	u.performRefreshCallCount++
+	u.performRefreshArgs = append(u.performRefreshArgs, &PerformRefreshArgs{
+		Ctx:              ctx,
+		DN:               userDN,
+		ExpectedUsername: expectedUsername,
+		ExpectedSubject:  expectedSubject,
+	})
+	if u.PerformRefreshErr != nil {
+		return u.PerformRefreshErr
+	}
+	return nil
+}
+
+func (u *TestUpstreamLDAPIdentityProvider) PerformRefreshCallCount() int {
+	return u.performRefreshCallCount
+}
+
+func (u *TestUpstreamLDAPIdentityProvider) PerformRefreshArgs(call int) *PerformRefreshArgs {
+	if u.performRefreshArgs == nil {
+		u.performRefreshArgs = make([]*PerformRefreshArgs, 0)
+	}
+	return u.performRefreshArgs[call]
+}
+
 type TestUpstreamOIDCIdentityProvider struct {
 	Name                     string
 	ClientID                 string
@@ -390,31 +424,54 @@ func (b *UpstreamIDPListerBuilder) RequireExactlyOneCallToPerformRefresh(
 	t.Helper()
 	var actualArgs *PerformRefreshArgs
 	var actualNameOfUpstreamWhichMadeCall string
-	actualCallCountAcrossAllOIDCUpstreams := 0
+	actualCallCountAcrossAllUpstreams := 0
 	for _, upstreamOIDC := range b.upstreamOIDCIdentityProviders {
 		callCountOnThisUpstream := upstreamOIDC.performRefreshCallCount
-		actualCallCountAcrossAllOIDCUpstreams += callCountOnThisUpstream
+		actualCallCountAcrossAllUpstreams += callCountOnThisUpstream
 		if callCountOnThisUpstream == 1 {
 			actualNameOfUpstreamWhichMadeCall = upstreamOIDC.Name
 			actualArgs = upstreamOIDC.performRefreshArgs[0]
 		}
 	}
-	require.Equal(t, 1, actualCallCountAcrossAllOIDCUpstreams,
+	for _, upstreamLDAP := range b.upstreamLDAPIdentityProviders {
-		"should have been exactly one call to PerformRefresh() by all OIDC upstreams",
+		callCountOnThisUpstream := upstreamLDAP.performRefreshCallCount
+		actualCallCountAcrossAllUpstreams += callCountOnThisUpstream
+		if callCountOnThisUpstream == 1 {
+			actualNameOfUpstreamWhichMadeCall = upstreamLDAP.Name
+			actualArgs = upstreamLDAP.performRefreshArgs[0]
+		}
+	}
+	for _, upstreamAD := range b.upstreamActiveDirectoryIdentityProviders {
+		callCountOnThisUpstream := upstreamAD.performRefreshCallCount
+		actualCallCountAcrossAllUpstreams += callCountOnThisUpstream
+		if callCountOnThisUpstream == 1 {
+			actualNameOfUpstreamWhichMadeCall = upstreamAD.Name
+			actualArgs = upstreamAD.performRefreshArgs[0]
+		}
+	}
+	require.Equal(t, 1, actualCallCountAcrossAllUpstreams,
+		"should have been exactly one call to PerformRefresh() by all upstreams",
 	)
 	require.Equal(t, expectedPerformedByUpstreamName, actualNameOfUpstreamWhichMadeCall,
-		"PerformRefresh() was called on the wrong OIDC upstream",
+		"PerformRefresh() was called on the wrong upstream",
 	)
 	require.Equal(t, expectedArgs, actualArgs)
 }
 
 func (b *UpstreamIDPListerBuilder) RequireExactlyZeroCallsToPerformRefresh(t *testing.T) {
 	t.Helper()
-	actualCallCountAcrossAllOIDCUpstreams := 0
+	actualCallCountAcrossAllUpstreams := 0
 	for _, upstreamOIDC := range b.upstreamOIDCIdentityProviders {
-		actualCallCountAcrossAllOIDCUpstreams += upstreamOIDC.performRefreshCallCount
+		actualCallCountAcrossAllUpstreams += upstreamOIDC.performRefreshCallCount
 	}
-	require.Equal(t, 0, actualCallCountAcrossAllOIDCUpstreams,
+	for _, upstreamLDAP := range b.upstreamLDAPIdentityProviders {
+		actualCallCountAcrossAllUpstreams += upstreamLDAP.performRefreshCallCount
+	}
+	for _, upstreamActiveDirectory := range b.upstreamActiveDirectoryIdentityProviders {
+		actualCallCountAcrossAllUpstreams += upstreamActiveDirectory.performRefreshCallCount
+	}
+
+	require.Equal(t, 0, actualCallCountAcrossAllUpstreams,
 		"expected exactly zero calls to PerformRefresh()",
 	)
 }

internal/upstreamldap/upstreamldap.go

@@ -21,12 +21,12 @@ import (
 	"github.com/go-ldap/ldap/v3"
 	"github.com/google/uuid"
 	"k8s.io/apimachinery/pkg/types"
-	"k8s.io/apiserver/pkg/authentication/authenticator"
 	"k8s.io/apiserver/pkg/authentication/user"
 	"k8s.io/utils/trace"
 
 	"go.pinniped.dev/internal/authenticators"
 	"go.pinniped.dev/internal/endpointaddr"
+	"go.pinniped.dev/internal/oidc/downstreamsession"
 	"go.pinniped.dev/internal/oidc/provider"
 	"go.pinniped.dev/internal/plog"
 )
@@ -169,6 +169,73 @@ func (p *Provider) GetConfig() ProviderConfig {
 	return p.c
 }
 
+func (p *Provider) PerformRefresh(ctx context.Context, userDN, expectedUsername, expectedSubject string) error {
+	t := trace.FromContext(ctx).Nest("slow ldap refresh attempt", trace.Field{Key: "providerName", Value: p.GetName()})
+	defer t.LogIfLong(500 * time.Millisecond) // to help users debug slow LDAP searches
+	searchResult, err := p.performRefresh(ctx, userDN)
+	if err != nil {
+		p.traceRefreshFailure(t, err)
+		return err
+	}
+
+	// if any more or less than one entry, error.
+	// we don't need to worry about logging this because we know it's a dn.
+	if len(searchResult.Entries) != 1 {
+		return fmt.Errorf(`searching for user "%s" resulted in %d search results, but expected 1 result`,
+			userDN, len(searchResult.Entries),
+		)
+	}
+
+	userEntry := searchResult.Entries[0]
+	if len(userEntry.DN) == 0 {
+		return fmt.Errorf(`searching for user with original DN "%s" resulted in search result without DN`, userDN)
+	}
+
+	newUsername, err := p.getSearchResultAttributeValue(p.c.UserSearch.UsernameAttribute, userEntry, userDN)
+	if err != nil {
+		return err
+	}
+	if newUsername != expectedUsername {
+		return fmt.Errorf(`searching for user "%s" returned a different username than the previous value. expected: "%s", actual: "%s"`,
+			userDN, expectedUsername, newUsername,
+		)
+	}
+
+	newUID, err := p.getSearchResultAttributeRawValueEncoded(p.c.UserSearch.UIDAttribute, userEntry, userDN)
+	if err != nil {
+		return err
+	}
+	newSubject := downstreamsession.DownstreamLDAPSubject(newUID, *p.GetURL())
+	if newSubject != expectedSubject {
+		return fmt.Errorf(`searching for user "%s" produced a different subject than the previous value. expected: "%s", actual: "%s"`, userDN, expectedSubject, newSubject)
+	}
+
+	// we checked that the user still exists and their information is the same, so just return.
+	return nil
+}
+
+func (p *Provider) performRefresh(ctx context.Context, userDN string) (*ldap.SearchResult, error) {
+	search := p.refreshUserSearchRequest(userDN)
+
+	conn, err := p.dial(ctx)
+	if err != nil {
+		return nil, fmt.Errorf(`error dialing host "%s": %w`, p.c.Host, err)
+	}
+	defer conn.Close()
+
+	err = conn.Bind(p.c.BindUsername, p.c.BindPassword)
+	if err != nil {
+		return nil, fmt.Errorf(`error binding as "%s" before user search: %w`, p.c.BindUsername, err)
+	}
+
+	searchResult, err := conn.Search(search)
+
+	if err != nil {
+		return nil, fmt.Errorf(`error searching for user "%s": %w`, userDN, err)
+	}
+	return searchResult, nil
+}
+
 func (p *Provider) dial(ctx context.Context) (Conn, error) {
 	tlsAddr, err := endpointaddr.Parse(p.c.Host, defaultLDAPSPort)
 	if err != nil {
@@ -310,7 +377,7 @@ func (p *Provider) TestConnection(ctx context.Context) error {
 // authentication for a given end user's username. It runs the same logic as AuthenticateUser except it does
 // not bind as that user, so it does not test their password. It returns the same values that a real call to
 // AuthenticateUser with the correct password would return.
-func (p *Provider) DryRunAuthenticateUser(ctx context.Context, username string) (*authenticator.Response, bool, error) {
+func (p *Provider) DryRunAuthenticateUser(ctx context.Context, username string) (*authenticators.Response, bool, error) {
 	endUserBindFunc := func(conn Conn, foundUserDN string) error {
 		// Act as if the end user bind always succeeds.
 		return nil
@@ -319,14 +386,14 @@ func (p *Provider) DryRunAuthenticateUser(ctx context.Context, username string)
 }
 
 // Authenticate an end user and return their mapped username, groups, and UID. Implements authenticators.UserAuthenticator.
-func (p *Provider) AuthenticateUser(ctx context.Context, username, password string) (*authenticator.Response, bool, error) {
+func (p *Provider) AuthenticateUser(ctx context.Context, username, password string) (*authenticators.Response, bool, error) {
 	endUserBindFunc := func(conn Conn, foundUserDN string) error {
 		return conn.Bind(foundUserDN, password)
 	}
 	return p.authenticateUserImpl(ctx, username, endUserBindFunc)
 }
 
-func (p *Provider) authenticateUserImpl(ctx context.Context, username string, bindFunc func(conn Conn, foundUserDN string) error) (*authenticator.Response, bool, error) {
+func (p *Provider) authenticateUserImpl(ctx context.Context, username string, bindFunc func(conn Conn, foundUserDN string) error) (*authenticators.Response, bool, error) {
 	t := trace.FromContext(ctx).Nest("slow ldap authenticate user attempt", trace.Field{Key: "providerName", Value: p.GetName()})
 	defer t.LogIfLong(500 * time.Millisecond) // to help users debug slow LDAP searches
 
@@ -355,24 +422,16 @@ func (p *Provider) authenticateUserImpl(ctx context.Context, username string, bi
 		return nil, false, fmt.Errorf(`error binding as "%s" before user search: %w`, p.c.BindUsername, err)
 	}
 
-	mappedUsername, mappedUID, mappedGroupNames, err := p.searchAndBindUser(conn, username, bindFunc)
+	response, err := p.searchAndBindUser(conn, username, bindFunc)
 	if err != nil {
 		p.traceAuthFailure(t, err)
 		return nil, false, err
 	}
-	if len(mappedUsername) == 0 || len(mappedUID) == 0 {
+	if response == nil {
-		// Couldn't find the username or couldn't bind using the password.
 		p.traceAuthFailure(t, fmt.Errorf("bad username or password"))
 		return nil, false, nil
 	}
 
-	response := &authenticator.Response{
-		User: &user.DefaultInfo{
-			Name:   mappedUsername,
-			UID:    mappedUID,
-			Groups: mappedGroupNames,
-		},
-	}
 	p.traceAuthSuccess(t)
 	return response, true, nil
 }
@@ -454,7 +513,7 @@ func (p *Provider) SearchForDefaultNamingContext(ctx context.Context) (string, e
 	return searchBase, nil
 }
 
-func (p *Provider) searchAndBindUser(conn Conn, username string, bindFunc func(conn Conn, foundUserDN string) error) (string, string, []string, error) {
+func (p *Provider) searchAndBindUser(conn Conn, username string, bindFunc func(conn Conn, foundUserDN string) error) (*authenticators.Response, error) {
 	searchResult, err := conn.Search(p.userSearchRequest(username))
 	if err != nil {
 		plog.All(`error searching for user`,
@@ -462,7 +521,7 @@ func (p *Provider) searchAndBindUser(conn Conn, username string, bindFunc func(c
 			"username", username,
 			"err", err,
 		)
-		return "", "", nil, fmt.Errorf(`error searching for user: %w`, err)
+		return nil, fmt.Errorf(`error searching for user: %w`, err)
 	}
 	if len(searchResult.Entries) == 0 {
 		if plog.Enabled(plog.LevelAll) {
@@ -473,38 +532,38 @@ func (p *Provider) searchAndBindUser(conn Conn, username string, bindFunc func(c
 		} else {
 			plog.Debug("error finding user: user not found (cowardly avoiding printing username because log level is not 'all')", "upstreamName", p.GetName())
 		}
-		return "", "", nil, nil
+		return nil, nil
 	}
 
 	// At this point, we have matched at least one entry, so we can be confident that the username is not actually
 	// someone's password mistakenly entered into the username field, so we can log it without concern.
 	if len(searchResult.Entries) > 1 {
-		return "", "", nil, fmt.Errorf(`searching for user "%s" resulted in %d search results, but expected 1 result`,
+		return nil, fmt.Errorf(`searching for user "%s" resulted in %d search results, but expected 1 result`,
 			username, len(searchResult.Entries),
 		)
 	}
 	userEntry := searchResult.Entries[0]
 	if len(userEntry.DN) == 0 {
-		return "", "", nil, fmt.Errorf(`searching for user "%s" resulted in search result without DN`, username)
+		return nil, fmt.Errorf(`searching for user "%s" resulted in search result without DN`, username)
 	}
 
 	mappedUsername, err := p.getSearchResultAttributeValue(p.c.UserSearch.UsernameAttribute, userEntry, username)
 	if err != nil {
-		return "", "", nil, err
+		return nil, err
 	}
 
 	// We would like to support binary typed attributes for UIDs, so always read them as binary and encode them,
 	// even when the attribute may not be binary.
 	mappedUID, err := p.getSearchResultAttributeRawValueEncoded(p.c.UserSearch.UIDAttribute, userEntry, username)
 	if err != nil {
-		return "", "", nil, err
+		return nil, err
 	}
 
 	mappedGroupNames := []string{}
 	if len(p.c.GroupSearch.Base) > 0 {
 		mappedGroupNames, err = p.searchGroupsForUserDN(conn, userEntry.DN)
 		if err != nil {
-			return "", "", nil, err
+			return nil, err
 		}
 	}
 	sort.Strings(mappedGroupNames)
@@ -516,12 +575,26 @@ func (p *Provider) searchAndBindUser(conn Conn, username string, bindFunc func(c
 			err, "upstreamName", p.GetName(), "username", username, "dn", userEntry.DN)
 		ldapErr := &ldap.Error{}
 		if errors.As(err, &ldapErr) && ldapErr.ResultCode == ldap.LDAPResultInvalidCredentials {
-			return "", "", nil, nil
+			return nil, nil
 		}
-		return "", "", nil, fmt.Errorf(`error binding for user "%s" using provided password against DN "%s": %w`, username, userEntry.DN, err)
+		return nil, fmt.Errorf(`error binding for user "%s" using provided password against DN "%s": %w`, username, userEntry.DN, err)
 	}
 
-	return mappedUsername, mappedUID, mappedGroupNames, nil
+	if len(mappedUsername) == 0 || len(mappedUID) == 0 {
+		// Couldn't find the username or couldn't bind using the password.
+		return nil, nil
+	}
+
+	response := &authenticators.Response{
+		User: &user.DefaultInfo{
+			Name:   mappedUsername,
+			UID:    mappedUID,
+			Groups: mappedGroupNames,
+		},
+		DN: userEntry.DN,
+	}
+
+	return response, nil
 }
 
 func (p *Provider) defaultNamingContextRequest() *ldap.SearchRequest {
@@ -568,6 +641,21 @@ func (p *Provider) groupSearchRequest(userDN string) *ldap.SearchRequest {
 	}
 }
 
+func (p *Provider) refreshUserSearchRequest(dn string) *ldap.SearchRequest {
+	// See https://ldap.com/the-ldap-search-operation for general documentation of LDAP search options.
+	return &ldap.SearchRequest{
+		BaseDN:       dn,
+		Scope:        ldap.ScopeBaseObject,
+		DerefAliases: ldap.NeverDerefAliases,
+		SizeLimit:    2,
+		TimeLimit:    90,
+		TypesOnly:    false,
+		Filter:       "(objectClass=*)", // we already have the dn, so the filter doesn't matter
+		Attributes:   p.userSearchRequestedAttributes(),
+		Controls:     nil, // this could be used to enable paging, but we're already limiting the result max size
+	}
+}
+
 func (p *Provider) userSearchRequestedAttributes() []string {
 	attributes := []string{}
 	if p.c.UserSearch.UsernameAttribute != distinguishedNameAttributeName {
@@ -687,6 +775,12 @@ func (p *Provider) traceSearchBaseDiscoveryFailure(t *trace.Trace, err error) {
 		trace.Field{Key: "reason", Value: err.Error()})
 }
 
+func (p *Provider) traceRefreshFailure(t *trace.Trace, err error) {
+	t.Step("refresh failed",
+		trace.Field{Key: "reason", Value: err.Error()},
+	)
+}
+
 func MicrosoftUUIDFromBinary(attributeName string) func(entry *ldap.Entry) (string, error) {
 	// validation has already been done so we can just get the attribute...
 	return func(entry *ldap.Entry) (string, error) {

internal/upstreamldap/upstreamldap_test.go

@@ -18,9 +18,9 @@ import (
 	"github.com/go-ldap/ldap/v3"
 	"github.com/golang/mock/gomock"
 	"github.com/stretchr/testify/require"
-	"k8s.io/apiserver/pkg/authentication/authenticator"
 	"k8s.io/apiserver/pkg/authentication/user"
 
+	"go.pinniped.dev/internal/authenticators"
 	"go.pinniped.dev/internal/certauthority"
 	"go.pinniped.dev/internal/endpointaddr"
 	"go.pinniped.dev/internal/mocks/mockldapconn"
@@ -151,7 +151,7 @@ func TestEndUserAuthentication(t *testing.T) {
 	}
 
 	// The auth response which matches the exampleUserSearchResult and exampleGroupSearchResult.
-	expectedAuthResponse := func(editFunc func(r *user.DefaultInfo)) *authenticator.Response {
+	expectedAuthResponse := func(editFunc func(r *user.DefaultInfo)) *authenticators.Response {
 		u := &user.DefaultInfo{
 			Name:   testUserSearchResultUsernameAttributeValue,
 			UID:    base64.RawURLEncoding.EncodeToString([]byte(testUserSearchResultUIDAttributeValue)),
@@ -160,7 +160,7 @@ func TestEndUserAuthentication(t *testing.T) {
 		if editFunc != nil {
 			editFunc(u)
 		}
-		return &authenticator.Response{User: u}
+		return &authenticators.Response{User: u, DN: testUserSearchResultDNValue}
 	}
 
 	tests := []struct {
@@ -173,7 +173,7 @@ func TestEndUserAuthentication(t *testing.T) {
 		dialError                  error
 		wantError                  string
 		wantToSkipDial             bool
-		wantAuthResponse           *authenticator.Response
+		wantAuthResponse           *authenticators.Response
 		wantUnauthenticated        bool
 		skipDryRunAuthenticateUser bool // tests about when the end user bind fails don't make sense for DryRunAuthenticateUser()
 	}{
@@ -498,12 +498,13 @@ func TestEndUserAuthentication(t *testing.T) {
 			bindEndUserMocks: func(conn *mockldapconn.MockConn) {
 				conn.EXPECT().Bind(testUserSearchResultDNValue, testUpstreamPassword).Times(1)
 			},
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
 				User: &user.DefaultInfo{
 					Name:   testUserSearchResultUsernameAttributeValue,
 					UID:    base64.RawURLEncoding.EncodeToString([]byte(testUserSearchResultUIDAttributeValue)),
 					Groups: []string{"a", "b", "c"},
 				},
+				DN: testUserSearchResultDNValue,
 			},
 		},
 		{
@@ -1212,6 +1213,340 @@ func TestEndUserAuthentication(t *testing.T) {
 	}
 }
 
+func TestUpstreamRefresh(t *testing.T) {
+	expectedUserSearch := &ldap.SearchRequest{
+		BaseDN:       testUserSearchResultDNValue,
+		Scope:        ldap.ScopeBaseObject,
+		DerefAliases: ldap.NeverDerefAliases,
+		SizeLimit:    2,
+		TimeLimit:    90,
+		TypesOnly:    false,
+		Filter:       "(objectClass=*)",
+		Attributes:   []string{testUserSearchUsernameAttribute, testUserSearchUIDAttribute},
+		Controls:     nil, // don't need paging because we set the SizeLimit so small
+	}
+
+	happyPathUserSearchResult := &ldap.SearchResult{
+		Entries: []*ldap.Entry{
+			{
+				DN: testUserSearchResultDNValue,
+				Attributes: []*ldap.EntryAttribute{
+					{
+						Name:   testUserSearchUsernameAttribute,
+						Values: []string{testUserSearchResultUsernameAttributeValue},
+					},
+					{
+						Name:       testUserSearchUIDAttribute,
+						ByteValues: [][]byte{[]byte(testUserSearchResultUIDAttributeValue)},
+					},
+				},
+			},
+		},
+	}
+
+	providerConfig := &ProviderConfig{
+		Name:               "some-provider-name",
+		Host:               testHost,
+		CABundle:           nil, // this field is only used by the production dialer, which is replaced by a mock for this test
+		ConnectionProtocol: TLS,
+		BindUsername:       testBindUsername,
+		BindPassword:       testBindPassword,
+		UserSearch: UserSearchConfig{
+			Base:              testUserSearchBase,
+			UIDAttribute:      testUserSearchUIDAttribute,
+			UsernameAttribute: testUserSearchUsernameAttribute,
+		},
+	}
+
+	tests := []struct {
+		name           string
+		providerConfig *ProviderConfig
+		setupMocks     func(conn *mockldapconn.MockConn)
+		dialError      error
+		wantErr        string
+	}{
+		{
+			name:           "happy path where searching the dn returns a single entry",
+			providerConfig: providerConfig,
+			setupMocks: func(conn *mockldapconn.MockConn) {
+				conn.EXPECT().Bind(testBindUsername, testBindPassword).Times(1)
+				conn.EXPECT().Search(expectedUserSearch).Return(happyPathUserSearchResult, nil).Times(1)
+				conn.EXPECT().Close().Times(1)
+			},
+		},
+		{
+			name:           "error where dial fails",
+			providerConfig: providerConfig,
+			dialError:      errors.New("some dial error"),
+			wantErr:        "error dialing host \"ldap.example.com:8443\": some dial error",
+		},
+		{
+			name:           "error binding",
+			providerConfig: providerConfig,
+			setupMocks: func(conn *mockldapconn.MockConn) {
+				conn.EXPECT().Bind(testBindUsername, testBindPassword).Return(errors.New("some bind error")).Times(1)
+				conn.EXPECT().Close().Times(1)
+			},
+			wantErr: "error binding as \"cn=some-bind-username,dc=pinniped,dc=dev\" before user search: some bind error",
+		},
+		{
+			name:           "search result returns no entries",
+			providerConfig: providerConfig,
+			setupMocks: func(conn *mockldapconn.MockConn) {
+				conn.EXPECT().Bind(testBindUsername, testBindPassword).Times(1)
+				conn.EXPECT().Search(expectedUserSearch).Return(&ldap.SearchResult{
+					Entries: []*ldap.Entry{},
+				}, nil).Times(1)
+				conn.EXPECT().Close().Times(1)
+			},
+			wantErr: "searching for user \"some-upstream-user-dn\" resulted in 0 search results, but expected 1 result",
+		},
+		{
+			name:           "error searching",
+			providerConfig: providerConfig,
+			setupMocks: func(conn *mockldapconn.MockConn) {
+				conn.EXPECT().Bind(testBindUsername, testBindPassword).Times(1)
+				conn.EXPECT().Search(expectedUserSearch).Return(nil, errors.New("some search error"))
+				conn.EXPECT().Close().Times(1)
+			},
+			wantErr: "error searching for user \"some-upstream-user-dn\": some search error",
+		},
+		{
+			name:           "search result returns more than one entry",
+			providerConfig: providerConfig,
+			setupMocks: func(conn *mockldapconn.MockConn) {
+				conn.EXPECT().Bind(testBindUsername, testBindPassword).Times(1)
+				conn.EXPECT().Search(expectedUserSearch).Return(&ldap.SearchResult{
+					Entries: []*ldap.Entry{
+						{
+							DN:         testUserSearchResultDNValue,
+							Attributes: []*ldap.EntryAttribute{},
+						},
+						{
+							DN:         "doesn't-matter",
+							Attributes: []*ldap.EntryAttribute{},
+						},
+					},
+				}, nil).Times(1)
+				conn.EXPECT().Close().Times(1)
+			},
+			wantErr: "searching for user \"some-upstream-user-dn\" resulted in 2 search results, but expected 1 result",
+		},
+		{
+			name:           "search result has wrong uid",
+			providerConfig: providerConfig,
+			setupMocks: func(conn *mockldapconn.MockConn) {
+				conn.EXPECT().Bind(testBindUsername, testBindPassword).Times(1)
+				conn.EXPECT().Search(expectedUserSearch).Return(&ldap.SearchResult{
+					Entries: []*ldap.Entry{
+						{
+							DN: testUserSearchResultDNValue,
+							Attributes: []*ldap.EntryAttribute{
+								{
+									Name:   testUserSearchUsernameAttribute,
+									Values: []string{testUserSearchResultUsernameAttributeValue},
+								},
+								{
+									Name:       testUserSearchUIDAttribute,
+									ByteValues: [][]byte{[]byte("wrong-uid")},
+								},
+							},
+						},
+					},
+				}, nil).Times(1)
+				conn.EXPECT().Close().Times(1)
+			},
+			wantErr: "searching for user \"some-upstream-user-dn\" produced a different subject than the previous value. expected: \"ldaps://ldap.example.com:8443?base=some-upstream-user-base-dn&sub=c29tZS11cHN0cmVhbS11aWQtdmFsdWU\", actual: \"ldaps://ldap.example.com:8443?base=some-upstream-user-base-dn&sub=d3JvbmctdWlk\"",
+		},
+		{
+			name:           "search result has wrong username",
+			providerConfig: providerConfig,
+			setupMocks: func(conn *mockldapconn.MockConn) {
+				conn.EXPECT().Bind(testBindUsername, testBindPassword).Times(1)
+				conn.EXPECT().Search(expectedUserSearch).Return(&ldap.SearchResult{
+					Entries: []*ldap.Entry{
+						{
+							DN: testUserSearchResultDNValue,
+							Attributes: []*ldap.EntryAttribute{
+								{
+									Name:   testUserSearchUsernameAttribute,
+									Values: []string{"wrong-username"},
+								},
+							},
+						},
+					},
+				}, nil).Times(1)
+				conn.EXPECT().Close().Times(1)
+			},
+			wantErr: "searching for user \"some-upstream-user-dn\" returned a different username than the previous value. expected: \"some-upstream-username-value\", actual: \"wrong-username\"",
+		},
+		{
+			name:           "search result has no dn",
+			providerConfig: providerConfig,
+			setupMocks: func(conn *mockldapconn.MockConn) {
+				conn.EXPECT().Bind(testBindUsername, testBindPassword).Times(1)
+				conn.EXPECT().Search(expectedUserSearch).Return(&ldap.SearchResult{
+					Entries: []*ldap.Entry{
+						{
+							Attributes: []*ldap.EntryAttribute{
+								{
+									Name:   testUserSearchUsernameAttribute,
+									Values: []string{testUserSearchResultUsernameAttributeValue},
+								},
+								{
+									Name:       testUserSearchUIDAttribute,
+									ByteValues: [][]byte{[]byte(testUserSearchResultUIDAttributeValue)},
+								},
+							},
+						},
+					},
+				}, nil).Times(1)
+				conn.EXPECT().Close().Times(1)
+			},
+			wantErr: "searching for user with original DN \"some-upstream-user-dn\" resulted in search result without DN",
+		},
+		{
+			name:           "search result has 0 values for username attribute",
+			providerConfig: providerConfig,
+			setupMocks: func(conn *mockldapconn.MockConn) {
+				conn.EXPECT().Bind(testBindUsername, testBindPassword).Times(1)
+				conn.EXPECT().Search(expectedUserSearch).Return(&ldap.SearchResult{
+					Entries: []*ldap.Entry{
+						{
+							DN: testUserSearchResultDNValue,
+							Attributes: []*ldap.EntryAttribute{
+								{
+									Name:   testUserSearchUsernameAttribute,
+									Values: []string{},
+								},
+								{
+									Name:       testUserSearchUIDAttribute,
+									ByteValues: [][]byte{[]byte(testUserSearchResultUIDAttributeValue)},
+								},
+							},
+						},
+					},
+				}, nil).Times(1)
+				conn.EXPECT().Close().Times(1)
+			},
+			wantErr: "found 0 values for attribute \"some-upstream-username-attribute\" while searching for user \"some-upstream-user-dn\", but expected 1 result",
+		},
+		{
+			name:           "search result has more than one value for username attribute",
+			providerConfig: providerConfig,
+			setupMocks: func(conn *mockldapconn.MockConn) {
+				conn.EXPECT().Bind(testBindUsername, testBindPassword).Times(1)
+				conn.EXPECT().Search(expectedUserSearch).Return(&ldap.SearchResult{
+					Entries: []*ldap.Entry{
+						{
+							DN: testUserSearchResultDNValue,
+							Attributes: []*ldap.EntryAttribute{
+								{
+									Name:   testUserSearchUsernameAttribute,
+									Values: []string{testUserSearchResultUsernameAttributeValue, "something-else"},
+								},
+								{
+									Name:       testUserSearchUIDAttribute,
+									ByteValues: [][]byte{[]byte(testUserSearchResultUIDAttributeValue)},
+								},
+							},
+						},
+					},
+				}, nil).Times(1)
+				conn.EXPECT().Close().Times(1)
+			},
+			wantErr: "found 2 values for attribute \"some-upstream-username-attribute\" while searching for user \"some-upstream-user-dn\", but expected 1 result",
+		},
+		{
+			name:           "search result has 0 values for uid attribute",
+			providerConfig: providerConfig,
+			setupMocks: func(conn *mockldapconn.MockConn) {
+				conn.EXPECT().Bind(testBindUsername, testBindPassword).Times(1)
+				conn.EXPECT().Search(expectedUserSearch).Return(&ldap.SearchResult{
+					Entries: []*ldap.Entry{
+						{
+							DN: testUserSearchResultDNValue,
+							Attributes: []*ldap.EntryAttribute{
+								{
+									Name:   testUserSearchUsernameAttribute,
+									Values: []string{testUserSearchResultUsernameAttributeValue},
+								},
+								{
+									Name:       testUserSearchUIDAttribute,
+									ByteValues: [][]byte{},
+								},
+							},
+						},
+					},
+				}, nil).Times(1)
+				conn.EXPECT().Close().Times(1)
+			},
+			wantErr: "found 0 values for attribute \"some-upstream-uid-attribute\" while searching for user \"some-upstream-user-dn\", but expected 1 result",
+		},
+		{
+			name:           "search result has 2 values for uid attribute",
+			providerConfig: providerConfig,
+			setupMocks: func(conn *mockldapconn.MockConn) {
+				conn.EXPECT().Bind(testBindUsername, testBindPassword).Times(1)
+				conn.EXPECT().Search(expectedUserSearch).Return(&ldap.SearchResult{
+					Entries: []*ldap.Entry{
+						{
+							DN: testUserSearchResultDNValue,
+							Attributes: []*ldap.EntryAttribute{
+								{
+									Name:   testUserSearchUsernameAttribute,
+									Values: []string{testUserSearchResultUsernameAttributeValue},
+								},
+								{
+									Name:       testUserSearchUIDAttribute,
+									ByteValues: [][]byte{[]byte(testUserSearchResultUIDAttributeValue), []byte("other-uid-value")},
+								},
+							},
+						},
+					},
+				}, nil).Times(1)
+				conn.EXPECT().Close().Times(1)
+			},
+			wantErr: "found 2 values for attribute \"some-upstream-uid-attribute\" while searching for user \"some-upstream-user-dn\", but expected 1 result",
+		},
+	}
+
+	for _, tt := range tests {
+		tt := tt
+		t.Run(tt.name, func(t *testing.T) {
+			ctrl := gomock.NewController(t)
+			t.Cleanup(ctrl.Finish)
+
+			conn := mockldapconn.NewMockConn(ctrl)
+			if tt.setupMocks != nil {
+				tt.setupMocks(conn)
+			}
+
+			dialWasAttempted := false
+			providerConfig.Dialer = LDAPDialerFunc(func(ctx context.Context, addr endpointaddr.HostPort) (Conn, error) {
+				dialWasAttempted = true
+				require.Equal(t, providerConfig.Host, addr.Endpoint())
+				if tt.dialError != nil {
+					return nil, tt.dialError
+				}
+
+				return conn, nil
+			})
+
+			provider := New(*providerConfig)
+			subject := "ldaps://ldap.example.com:8443?base=some-upstream-user-base-dn&sub=c29tZS11cHN0cmVhbS11aWQtdmFsdWU"
+			err := provider.PerformRefresh(context.Background(), testUserSearchResultDNValue, testUserSearchResultUsernameAttributeValue, subject)
+			if tt.wantErr != "" {
+				require.Error(t, err)
+				require.Equal(t, tt.wantErr, err.Error())
+			} else {
+				require.NoError(t, err)
+			}
+			require.Equal(t, true, dialWasAttempted)
+		})
+	}
+}
+
 func TestTestConnection(t *testing.T) {
 	providerConfig := func(editFunc func(p *ProviderConfig)) *ProviderConfig {
 		config := &ProviderConfig{

test/integration/ldap_client_test.go

@@ -17,9 +17,9 @@ import (
 
 	"github.com/stretchr/testify/assert"
 	"github.com/stretchr/testify/require"
-	"k8s.io/apiserver/pkg/authentication/authenticator"
 	"k8s.io/apiserver/pkg/authentication/user"
 
+	"go.pinniped.dev/internal/authenticators"
 	"go.pinniped.dev/internal/upstreamldap"
 	"go.pinniped.dev/test/testlib"
 )
@@ -74,7 +74,7 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 		password            string
 		provider            *upstreamldap.Provider
 		wantError           string
-		wantAuthResponse    *authenticator.Response
+		wantAuthResponse    *authenticators.Response
 		wantUnauthenticated bool
 	}{
 		{
@@ -82,8 +82,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 			username: "pinny",
 			password: pinnyPassword,
 			provider: upstreamldap.New(*providerConfig(nil)),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}},
+				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -94,8 +94,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 				p.Host = "127.0.0.1:" + ldapLocalhostPort
 				p.ConnectionProtocol = upstreamldap.StartTLS
 			})),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}},
+				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -103,8 +103,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 			username: "pinny",
 			password: pinnyPassword,
 			provider: upstreamldap.New(*providerConfig(func(p *upstreamldap.ProviderConfig) { p.UserSearch.Base = "dc=pinniped,dc=dev" })),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}},
+				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -112,8 +112,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 			username: "pinny",
 			password: pinnyPassword,
 			provider: upstreamldap.New(*providerConfig(func(p *upstreamldap.ProviderConfig) { p.UserSearch.Filter = "(cn={})" })),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}},
+				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -124,8 +124,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 				p.UserSearch.UsernameAttribute = "dn"
 				p.UserSearch.Filter = "cn={}"
 			})),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "cn=pinny,ou=users,dc=pinniped,dc=dev", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}},
+				User: &user.DefaultInfo{Name: "cn=pinny,ou=users,dc=pinniped,dc=dev", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -135,8 +135,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 			provider: upstreamldap.New(*providerConfig(func(p *upstreamldap.ProviderConfig) {
 				p.UserSearch.Filter = "(|(cn={})(mail={}))"
 			})),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}},
+				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -146,8 +146,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 			provider: upstreamldap.New(*providerConfig(func(p *upstreamldap.ProviderConfig) {
 				p.UserSearch.Filter = "(|(cn={})(mail={}))"
 			})),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}},
+				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -155,8 +155,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 			username: "pinny",
 			password: pinnyPassword,
 			provider: upstreamldap.New(*providerConfig(func(p *upstreamldap.ProviderConfig) { p.UserSearch.UIDAttribute = "dn" })),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "pinny", UID: b64("cn=pinny,ou=users,dc=pinniped,dc=dev"), Groups: []string{"ball-game-players", "seals"}},
+				User: &user.DefaultInfo{Name: "pinny", UID: b64("cn=pinny,ou=users,dc=pinniped,dc=dev"), Groups: []string{"ball-game-players", "seals"}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -164,8 +164,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 			username: "pinny",
 			password: pinnyPassword,
 			provider: upstreamldap.New(*providerConfig(func(p *upstreamldap.ProviderConfig) { p.UserSearch.UIDAttribute = "sn" })),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "pinny", UID: b64("Seal"), Groups: []string{"ball-game-players", "seals"}},
+				User: &user.DefaultInfo{Name: "pinny", UID: b64("Seal"), Groups: []string{"ball-game-players", "seals"}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -173,8 +173,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 			username: "seAl", // note that this is not case-sensitive! sn=Seal. The server decides which fields are compared case-sensitive.
 			password: pinnyPassword,
 			provider: upstreamldap.New(*providerConfig(func(p *upstreamldap.ProviderConfig) { p.UserSearch.UsernameAttribute = "sn" })),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "Seal", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}}, // note that the final answer has case preserved from the entry
+				User: &user.DefaultInfo{Name: "Seal", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev", // note that the final answer has case preserved from the entry
 			},
 		},
 		{
@@ -186,8 +186,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 				p.UserSearch.UsernameAttribute = "givenName"
 				p.UserSearch.UIDAttribute = "givenName"
 			})),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "Pinny the 🦭", UID: b64("Pinny the 🦭"), Groups: []string{"ball-game-players", "seals"}},
+				User: &user.DefaultInfo{Name: "Pinny the 🦭", UID: b64("Pinny the 🦭"), Groups: []string{"ball-game-players", "seals"}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -198,8 +198,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 				p.UserSearch.Filter = "givenName={}"
 				p.UserSearch.UsernameAttribute = "cn"
 			})),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}},
+				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -219,8 +219,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 			provider: upstreamldap.New(*providerConfig(func(p *upstreamldap.ProviderConfig) {
 				p.GroupSearch.Base = ""
 			})),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{}},
+				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -230,8 +230,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 			provider: upstreamldap.New(*providerConfig(func(p *upstreamldap.ProviderConfig) {
 				p.GroupSearch.Base = "ou=users,dc=pinniped,dc=dev" // there are no groups under this part of the tree
 			})),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{}},
+				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -241,11 +241,11 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 			provider: upstreamldap.New(*providerConfig(func(p *upstreamldap.ProviderConfig) {
 				p.GroupSearch.GroupNameAttribute = "dn"
 			})),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
 				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{
 					"cn=ball-game-players,ou=beach-groups,ou=groups,dc=pinniped,dc=dev",
 					"cn=seals,ou=groups,dc=pinniped,dc=dev",
-				}},
+				}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -255,11 +255,11 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 			provider: upstreamldap.New(*providerConfig(func(p *upstreamldap.ProviderConfig) {
 				p.GroupSearch.GroupNameAttribute = ""
 			})),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
 				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{
 					"cn=ball-game-players,ou=beach-groups,ou=groups,dc=pinniped,dc=dev",
 					"cn=seals,ou=groups,dc=pinniped,dc=dev",
-				}},
+				}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -269,8 +269,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 			provider: upstreamldap.New(*providerConfig(func(p *upstreamldap.ProviderConfig) {
 				p.GroupSearch.GroupNameAttribute = "objectClass" // silly example, but still a meaningful test
 			})),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"groupOfNames", "groupOfNames"}},
+				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"groupOfNames", "groupOfNames"}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -280,8 +280,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 			provider: upstreamldap.New(*providerConfig(func(p *upstreamldap.ProviderConfig) {
 				p.GroupSearch.Filter = "(&(&(objectClass=groupOfNames)(member={}))(cn=seals))"
 			})),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"seals"}},
+				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"seals"}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -291,8 +291,8 @@ func TestLDAPSearch_Parallel(t *testing.T) {
 			provider: upstreamldap.New(*providerConfig(func(p *upstreamldap.ProviderConfig) {
 				p.GroupSearch.Filter = "foobar={}" // foobar is not a valid attribute name for this LDAP server's schema
 			})),
-			wantAuthResponse: &authenticator.Response{
+			wantAuthResponse: &authenticators.Response{
-				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{}},
+				User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{}}, DN: "cn=pinny,ou=users,dc=pinniped,dc=dev",
 			},
 		},
 		{
@@ -670,14 +670,15 @@ func TestSimultaneousLDAPRequestsOnSingleProvider(t *testing.T) {
 		// Record failures but allow the test to keep running so that all the background goroutines have a chance to try.
 		assert.NoError(t, result.err)
 		assert.True(t, result.authenticated, "expected the user to be authenticated, but they were not")
-		assert.Equal(t, &authenticator.Response{
+		assert.Equal(t, &authenticators.Response{
 			User: &user.DefaultInfo{Name: "pinny", UID: b64("1000"), Groups: []string{"ball-game-players", "seals"}},
+			DN:   "cn=pinny,ou=users,dc=pinniped,dc=dev",
 		}, result.response)
 	}
 }
 
 type authUserResult struct {
-	response      *authenticator.Response
+	response      *authenticators.Response
 	authenticated bool
 	err           error
 }

test/integration/supervisor_login_test.go

@@ -44,7 +44,7 @@ func TestSupervisorLogin(t *testing.T) {
 	tests := []struct {
 		name                                 string
 		maybeSkip                            func(t *testing.T)
-		createIDP                            func(t *testing.T)
+		createIDP                            func(t *testing.T) string
 		requestAuthorization                 func(t *testing.T, downstreamAuthorizeURL, downstreamCallbackURL string, httpClient *http.Client)
 		wantDownstreamIDTokenSubjectToMatch  string
 		wantDownstreamIDTokenUsernameToMatch string
@@ -55,16 +55,16 @@ func TestSupervisorLogin(t *testing.T) {
 		// We don't necessarily have any way to revoke the user's session on the upstream provider,
 		// so to cause the upstream refresh to fail we can cheat by manipulating the user's session
 		// data in such a way that it should cause the next upstream refresh attempt to fail.
-		breakRefreshSessionData func(t *testing.T, customSessionData *psession.CustomSessionData)
+		breakRefreshSessionData func(t *testing.T, sessionData *psession.PinnipedSession, idpName string)
 	}{
 		{
 			name: "oidc with default username and groups claim settings",
 			maybeSkip: func(t *testing.T) {
 				// never need to skip this test
 			},
-			createIDP: func(t *testing.T) {
+			createIDP: func(t *testing.T) string {
 				t.Helper()
-				testlib.CreateTestOIDCIdentityProvider(t, idpv1alpha1.OIDCIdentityProviderSpec{
+				oidcIDP := testlib.CreateTestOIDCIdentityProvider(t, idpv1alpha1.OIDCIdentityProviderSpec{
 					Issuer: env.SupervisorUpstreamOIDC.Issuer,
 					TLS: &idpv1alpha1.TLSSpec{
 						CertificateAuthorityData: base64.StdEncoding.EncodeToString([]byte(env.SupervisorUpstreamOIDC.CABundle)),
@@ -73,9 +73,11 @@ func TestSupervisorLogin(t *testing.T) {
 						SecretName: testlib.CreateClientCredsSecret(t, env.SupervisorUpstreamOIDC.ClientID, env.SupervisorUpstreamOIDC.ClientSecret).Name,
 					},
 				}, idpv1alpha1.PhaseReady)
+				return oidcIDP.Name
 			},
 			requestAuthorization: requestAuthorizationUsingBrowserAuthcodeFlow,
-			breakRefreshSessionData: func(t *testing.T, customSessionData *psession.CustomSessionData) {
+			breakRefreshSessionData: func(t *testing.T, pinnipedSession *psession.PinnipedSession, _ string) {
+				customSessionData := pinnipedSession.Custom
 				require.Equal(t, psession.ProviderTypeOIDC, customSessionData.ProviderType)
 				require.NotEmpty(t, customSessionData.OIDC.UpstreamRefreshToken)
 				customSessionData.OIDC.UpstreamRefreshToken = "invalid-updated-refresh-token"
@@ -90,9 +92,9 @@ func TestSupervisorLogin(t *testing.T) {
 			maybeSkip: func(t *testing.T) {
 				// never need to skip this test
 			},
-			createIDP: func(t *testing.T) {
+			createIDP: func(t *testing.T) string {
 				t.Helper()
-				testlib.CreateTestOIDCIdentityProvider(t, idpv1alpha1.OIDCIdentityProviderSpec{
+				oidcIDP := testlib.CreateTestOIDCIdentityProvider(t, idpv1alpha1.OIDCIdentityProviderSpec{
 					Issuer: env.SupervisorUpstreamOIDC.Issuer,
 					TLS: &idpv1alpha1.TLSSpec{
 						CertificateAuthorityData: base64.StdEncoding.EncodeToString([]byte(env.SupervisorUpstreamOIDC.CABundle)),
@@ -108,9 +110,11 @@ func TestSupervisorLogin(t *testing.T) {
 						AdditionalScopes: env.SupervisorUpstreamOIDC.AdditionalScopes,
 					},
 				}, idpv1alpha1.PhaseReady)
+				return oidcIDP.Name
 			},
 			requestAuthorization: requestAuthorizationUsingBrowserAuthcodeFlow,
-			breakRefreshSessionData: func(t *testing.T, customSessionData *psession.CustomSessionData) {
+			breakRefreshSessionData: func(t *testing.T, pinnipedSession *psession.PinnipedSession, _ string) {
+				customSessionData := pinnipedSession.Custom
 				require.Equal(t, psession.ProviderTypeOIDC, customSessionData.ProviderType)
 				require.NotEmpty(t, customSessionData.OIDC.UpstreamRefreshToken)
 				customSessionData.OIDC.UpstreamRefreshToken = "invalid-updated-refresh-token"
@@ -124,9 +128,9 @@ func TestSupervisorLogin(t *testing.T) {
 			maybeSkip: func(t *testing.T) {
 				// never need to skip this test
 			},
-			createIDP: func(t *testing.T) {
+			createIDP: func(t *testing.T) string {
 				t.Helper()
-				testlib.CreateTestOIDCIdentityProvider(t, idpv1alpha1.OIDCIdentityProviderSpec{
+				oidcIDP := testlib.CreateTestOIDCIdentityProvider(t, idpv1alpha1.OIDCIdentityProviderSpec{
 					Issuer: env.SupervisorUpstreamOIDC.Issuer,
 					TLS: &idpv1alpha1.TLSSpec{
 						CertificateAuthorityData: base64.StdEncoding.EncodeToString([]byte(env.SupervisorUpstreamOIDC.CABundle)),
@@ -138,6 +142,7 @@ func TestSupervisorLogin(t *testing.T) {
 						AllowPasswordGrant: true, // allow the CLI password flow for this OIDCIdentityProvider
 					},
 				}, idpv1alpha1.PhaseReady)
+				return oidcIDP.Name
 			},
 			requestAuthorization: func(t *testing.T, downstreamAuthorizeURL, _ string, httpClient *http.Client) {
 				requestAuthorizationUsingCLIPasswordFlow(t,
@@ -148,7 +153,8 @@ func TestSupervisorLogin(t *testing.T) {
 					false,
 				)
 			},
-			breakRefreshSessionData: func(t *testing.T, customSessionData *psession.CustomSessionData) {
+			breakRefreshSessionData: func(t *testing.T, pinnipedSession *psession.PinnipedSession, _ string) {
+				customSessionData := pinnipedSession.Custom
 				require.Equal(t, psession.ProviderTypeOIDC, customSessionData.ProviderType)
 				require.NotEmpty(t, customSessionData.OIDC.UpstreamRefreshToken)
 				customSessionData.OIDC.UpstreamRefreshToken = "invalid-updated-refresh-token"
@@ -166,7 +172,7 @@ func TestSupervisorLogin(t *testing.T) {
 					t.Skip("LDAP integration test requires connectivity to an LDAP server")
 				}
 			},
-			createIDP: func(t *testing.T) {
+			createIDP: func(t *testing.T) string {
 				t.Helper()
 				secret := testlib.CreateTestSecret(t, env.SupervisorNamespace, "ldap-service-account", v1.SecretTypeBasicAuth,
 					map[string]string{
@@ -204,6 +210,7 @@ func TestSupervisorLogin(t *testing.T) {
 					secret.Name, secret.ResourceVersion,
 				)
 				requireSuccessfulLDAPIdentityProviderConditions(t, ldapIDP, expectedMsg)
+				return ldapIDP.Name
 			},
 			requestAuthorization: func(t *testing.T, downstreamAuthorizeURL, _ string, httpClient *http.Client) {
 				requestAuthorizationUsingCLIPasswordFlow(t,
@@ -214,7 +221,13 @@ func TestSupervisorLogin(t *testing.T) {
 					false,
 				)
 			},
-			breakRefreshSessionData: nil, // upstream refresh not yet implemented for this IDP type
+			breakRefreshSessionData: func(t *testing.T, pinnipedSession *psession.PinnipedSession, _ string) {
+				customSessionData := pinnipedSession.Custom
+				require.Equal(t, psession.ProviderTypeLDAP, customSessionData.ProviderType)
+				require.NotEmpty(t, customSessionData.LDAP.UserDN)
+				fositeSessionData := pinnipedSession.Fosite
+				fositeSessionData.Claims.Subject = "not-right"
+			},
 			// the ID token Subject should be the Host URL plus the value pulled from the requested UserSearch.Attributes.UID attribute
 			wantDownstreamIDTokenSubjectToMatch: "^" + regexp.QuoteMeta(
 				"ldaps://"+env.SupervisorUpstreamLDAP.Host+
@@ -233,7 +246,7 @@ func TestSupervisorLogin(t *testing.T) {
 					t.Skip("LDAP integration test requires connectivity to an LDAP server")
 				}
 			},
-			createIDP: func(t *testing.T) {
+			createIDP: func(t *testing.T) string {
 				t.Helper()
 				secret := testlib.CreateTestSecret(t, env.SupervisorNamespace, "ldap-service-account", v1.SecretTypeBasicAuth,
 					map[string]string{
@@ -271,6 +284,7 @@ func TestSupervisorLogin(t *testing.T) {
 					secret.Name, secret.ResourceVersion,
 				)
 				requireSuccessfulLDAPIdentityProviderConditions(t, ldapIDP, expectedMsg)
+				return ldapIDP.Name
 			},
 			requestAuthorization: func(t *testing.T, downstreamAuthorizeURL, _ string, httpClient *http.Client) {
 				requestAuthorizationUsingCLIPasswordFlow(t,
@@ -281,7 +295,13 @@ func TestSupervisorLogin(t *testing.T) {
 					false,
 				)
 			},
-			breakRefreshSessionData: nil, // upstream refresh not yet implemented for this IDP type
+			breakRefreshSessionData: func(t *testing.T, pinnipedSession *psession.PinnipedSession, _ string) {
+				customSessionData := pinnipedSession.Custom
+				require.Equal(t, psession.ProviderTypeLDAP, customSessionData.ProviderType)
+				require.NotEmpty(t, customSessionData.LDAP.UserDN)
+				fositeSessionData := pinnipedSession.Fosite
+				fositeSessionData.Claims.Extra["username"] = "not-the-same"
+			},
 			// the ID token Subject should be the Host URL plus the value pulled from the requested UserSearch.Attributes.UID attribute
 			wantDownstreamIDTokenSubjectToMatch: "^" + regexp.QuoteMeta(
 				"ldaps://"+env.SupervisorUpstreamLDAP.StartTLSOnlyHost+
@@ -300,7 +320,7 @@ func TestSupervisorLogin(t *testing.T) {
 					t.Skip("LDAP integration test requires connectivity to an LDAP server")
 				}
 			},
-			createIDP: func(t *testing.T) {
+			createIDP: func(t *testing.T) string {
 				t.Helper()
 				secret := testlib.CreateTestSecret(t, env.SupervisorNamespace, "ldap-service-account", v1.SecretTypeBasicAuth,
 					map[string]string{
@@ -338,6 +358,7 @@ func TestSupervisorLogin(t *testing.T) {
 					secret.Name, secret.ResourceVersion,
 				)
 				requireSuccessfulLDAPIdentityProviderConditions(t, ldapIDP, expectedMsg)
+				return ldapIDP.Name
 			},
 			requestAuthorization: func(t *testing.T, downstreamAuthorizeURL, _ string, httpClient *http.Client) {
 				requestAuthorizationUsingCLIPasswordFlow(t,
@@ -348,9 +369,8 @@ func TestSupervisorLogin(t *testing.T) {
 					true,
 				)
 			},
-			breakRefreshSessionData: nil, // upstream refresh not yet implemented for this IDP type
+			wantErrorDescription: "The resource owner or authorization server denied the request. Username/password not accepted by LDAP provider.",
-			wantErrorDescription:    "The resource owner or authorization server denied the request. Username/password not accepted by LDAP provider.",
+			wantErrorType:        "access_denied",
-			wantErrorType:           "access_denied",
 		},
 		{
 			name: "ldap login still works after updating bind secret",
@@ -360,7 +380,7 @@ func TestSupervisorLogin(t *testing.T) {
 					t.Skip("LDAP integration test requires connectivity to an LDAP server")
 				}
 			},
-			createIDP: func(t *testing.T) {
+			createIDP: func(t *testing.T) string {
 				t.Helper()
 
 				secret := testlib.CreateTestSecret(t, env.SupervisorNamespace, "ldap-service-account", v1.SecretTypeBasicAuth,
@@ -416,6 +436,7 @@ func TestSupervisorLogin(t *testing.T) {
 					requireEventually.NoError(err)
 					requireEventuallySuccessfulLDAPIdentityProviderConditions(t, requireEventually, ldapIDP, expectedMsg)
 				}, time.Minute, 500*time.Millisecond)
+				return ldapIDP.Name
 			},
 			requestAuthorization: func(t *testing.T, downstreamAuthorizeURL, _ string, httpClient *http.Client) {
 				requestAuthorizationUsingCLIPasswordFlow(t,
@@ -426,7 +447,12 @@ func TestSupervisorLogin(t *testing.T) {
 					false,
 				)
 			},
-			breakRefreshSessionData: nil, // upstream refresh not yet implemented for this IDP type
+			breakRefreshSessionData: func(t *testing.T, pinnipedSession *psession.PinnipedSession, _ string) {
+				customSessionData := pinnipedSession.Custom
+				require.Equal(t, psession.ProviderTypeLDAP, customSessionData.ProviderType)
+				require.NotEmpty(t, customSessionData.LDAP.UserDN)
+				customSessionData.LDAP.UserDN = "cn=not-a-user,dc=pinniped,dc=dev"
+			},
 			// the ID token Subject should be the Host URL plus the value pulled from the requested UserSearch.Attributes.UID attribute
 			wantDownstreamIDTokenSubjectToMatch: "^" + regexp.QuoteMeta(
 				"ldaps://"+env.SupervisorUpstreamLDAP.Host+
@@ -445,7 +471,7 @@ func TestSupervisorLogin(t *testing.T) {
 					t.Skip("LDAP integration test requires connectivity to an LDAP server")
 				}
 			},
-			createIDP: func(t *testing.T) {
+			createIDP: func(t *testing.T) string {
 				t.Helper()
 
 				secret := testlib.CreateTestSecret(t, env.SupervisorNamespace, "ldap-service-account", v1.SecretTypeBasicAuth,
@@ -515,6 +541,7 @@ func TestSupervisorLogin(t *testing.T) {
 					requireEventually.NoError(err)
 					requireEventuallySuccessfulLDAPIdentityProviderConditions(t, requireEventually, ldapIDP, expectedMsg)
 				}, time.Minute, 500*time.Millisecond)
+				return ldapIDP.Name
 			},
 			requestAuthorization: func(t *testing.T, downstreamAuthorizeURL, _ string, httpClient *http.Client) {
 				requestAuthorizationUsingCLIPasswordFlow(t,
@@ -525,7 +552,12 @@ func TestSupervisorLogin(t *testing.T) {
 					false,
 				)
 			},
-			breakRefreshSessionData: nil, // upstream refresh not yet implemented for this IDP type
+			breakRefreshSessionData: func(t *testing.T, pinnipedSession *psession.PinnipedSession, _ string) {
+				customSessionData := pinnipedSession.Custom
+				require.Equal(t, psession.ProviderTypeLDAP, customSessionData.ProviderType)
+				require.NotEmpty(t, customSessionData.LDAP.UserDN)
+				customSessionData.LDAP.UserDN = "cn=not-a-user,dc=pinniped,dc=dev"
+			},
 			// the ID token Subject should be the Host URL plus the value pulled from the requested UserSearch.Attributes.UID attribute
 			wantDownstreamIDTokenSubjectToMatch: "^" + regexp.QuoteMeta(
 				"ldaps://"+env.SupervisorUpstreamLDAP.Host+
@@ -547,7 +579,7 @@ func TestSupervisorLogin(t *testing.T) {
 					t.Skip("Active Directory hostname not specified")
 				}
 			},
-			createIDP: func(t *testing.T) {
+			createIDP: func(t *testing.T) string {
 				t.Helper()
 				secret := testlib.CreateTestSecret(t, env.SupervisorNamespace, "ad-service-account", v1.SecretTypeBasicAuth,
 					map[string]string{
@@ -570,6 +602,7 @@ func TestSupervisorLogin(t *testing.T) {
 					secret.Name, secret.ResourceVersion,
 				)
 				requireSuccessfulActiveDirectoryIdentityProviderConditions(t, adIDP, expectedMsg)
+				return adIDP.Name
 			},
 			requestAuthorization: func(t *testing.T, downstreamAuthorizeURL, _ string, httpClient *http.Client) {
 				requestAuthorizationUsingCLIPasswordFlow(t,
@@ -580,7 +613,13 @@ func TestSupervisorLogin(t *testing.T) {
 					false,
 				)
 			},
-			breakRefreshSessionData: nil, // upstream refresh not yet implemented for this IDP type
+			breakRefreshSessionData: func(t *testing.T, pinnipedSession *psession.PinnipedSession, _ string) {
+				customSessionData := pinnipedSession.Custom
+				require.Equal(t, psession.ProviderTypeActiveDirectory, customSessionData.ProviderType)
+				require.NotEmpty(t, customSessionData.ActiveDirectory.UserDN)
+				fositeSessionData := pinnipedSession.Fosite
+				fositeSessionData.Claims.Extra["username"] = "not-the-same"
+			},
 			// the ID token Subject should be the Host URL plus the value pulled from the requested UserSearch.Attributes.UID attribute
 			wantDownstreamIDTokenSubjectToMatch: "^" + regexp.QuoteMeta(
 				"ldaps://"+env.SupervisorUpstreamActiveDirectory.Host+
@@ -601,7 +640,7 @@ func TestSupervisorLogin(t *testing.T) {
 					t.Skip("Active Directory hostname not specified")
 				}
 			},
-			createIDP: func(t *testing.T) {
+			createIDP: func(t *testing.T) string {
 				t.Helper()
 				secret := testlib.CreateTestSecret(t, env.SupervisorNamespace, "ad-service-account", v1.SecretTypeBasicAuth,
 					map[string]string{
@@ -638,6 +677,7 @@ func TestSupervisorLogin(t *testing.T) {
 					secret.Name, secret.ResourceVersion,
 				)
 				requireSuccessfulActiveDirectoryIdentityProviderConditions(t, adIDP, expectedMsg)
+				return adIDP.Name
 			},
 			requestAuthorization: func(t *testing.T, downstreamAuthorizeURL, _ string, httpClient *http.Client) {
 				requestAuthorizationUsingCLIPasswordFlow(t,
@@ -648,7 +688,13 @@ func TestSupervisorLogin(t *testing.T) {
 					false,
 				)
 			},
-			breakRefreshSessionData: nil, // upstream refresh not yet implemented for this IDP type
+			breakRefreshSessionData: func(t *testing.T, pinnipedSession *psession.PinnipedSession, _ string) {
+				customSessionData := pinnipedSession.Custom
+				require.Equal(t, psession.ProviderTypeActiveDirectory, customSessionData.ProviderType)
+				require.NotEmpty(t, customSessionData.ActiveDirectory.UserDN)
+				fositeSessionData := pinnipedSession.Fosite
+				fositeSessionData.Claims.Subject = "not-right"
+			},
 			// the ID token Subject should be the Host URL plus the value pulled from the requested UserSearch.Attributes.UID attribute
 			wantDownstreamIDTokenSubjectToMatch: "^" + regexp.QuoteMeta(
 				"ldaps://"+env.SupervisorUpstreamActiveDirectory.Host+
@@ -670,7 +716,7 @@ func TestSupervisorLogin(t *testing.T) {
 					t.Skip("Active Directory hostname not specified")
 				}
 			},
-			createIDP: func(t *testing.T) {
+			createIDP: func(t *testing.T) string {
 				t.Helper()
 
 				secret := testlib.CreateTestSecret(t, env.SupervisorNamespace, "ad-service-account", v1.SecretTypeBasicAuth,
@@ -711,6 +757,7 @@ func TestSupervisorLogin(t *testing.T) {
 					requireEventually.NoError(err)
 					requireEventuallySuccessfulActiveDirectoryIdentityProviderConditions(t, requireEventually, adIDP, expectedMsg)
 				}, time.Minute, 500*time.Millisecond)
+				return adIDP.Name
 			},
 			requestAuthorization: func(t *testing.T, downstreamAuthorizeURL, _ string, httpClient *http.Client) {
 				requestAuthorizationUsingCLIPasswordFlow(t,
@@ -721,7 +768,12 @@ func TestSupervisorLogin(t *testing.T) {
 					false,
 				)
 			},
-			breakRefreshSessionData: nil, // upstream refresh not yet implemented for this IDP type
+			breakRefreshSessionData: func(t *testing.T, pinnipedSession *psession.PinnipedSession, _ string) {
+				customSessionData := pinnipedSession.Custom
+				require.Equal(t, psession.ProviderTypeActiveDirectory, customSessionData.ProviderType)
+				require.NotEmpty(t, customSessionData.ActiveDirectory.UserDN)
+				customSessionData.ActiveDirectory.UserDN = "cn=not-a-user,dc=pinniped,dc=dev"
+			},
 			// the ID token Subject should be the Host URL plus the value pulled from the requested UserSearch.Attributes.UID attribute
 			wantDownstreamIDTokenSubjectToMatch: "^" + regexp.QuoteMeta(
 				"ldaps://"+env.SupervisorUpstreamActiveDirectory.Host+
@@ -743,7 +795,7 @@ func TestSupervisorLogin(t *testing.T) {
 					t.Skip("Active Directory hostname not specified")
 				}
 			},
-			createIDP: func(t *testing.T) {
+			createIDP: func(t *testing.T) string {
 				t.Helper()
 
 				secret := testlib.CreateTestSecret(t, env.SupervisorNamespace, "ad-service-account", v1.SecretTypeBasicAuth,
@@ -799,6 +851,7 @@ func TestSupervisorLogin(t *testing.T) {
 					requireEventually.NoError(err)
 					requireEventuallySuccessfulActiveDirectoryIdentityProviderConditions(t, requireEventually, adIDP, expectedMsg)
 				}, time.Minute, 500*time.Millisecond)
+				return adIDP.Name
 			},
 			requestAuthorization: func(t *testing.T, downstreamAuthorizeURL, _ string, httpClient *http.Client) {
 				requestAuthorizationUsingCLIPasswordFlow(t,
@@ -809,7 +862,12 @@ func TestSupervisorLogin(t *testing.T) {
 					false,
 				)
 			},
-			breakRefreshSessionData: nil, // upstream refresh not yet implemented for this IDP type
+			breakRefreshSessionData: func(t *testing.T, pinnipedSession *psession.PinnipedSession, _ string) {
+				customSessionData := pinnipedSession.Custom
+				require.Equal(t, psession.ProviderTypeActiveDirectory, customSessionData.ProviderType)
+				require.NotEmpty(t, customSessionData.ActiveDirectory.UserDN)
+				customSessionData.ActiveDirectory.UserDN = "cn=not-a-user,dc=pinniped,dc=dev"
+			},
 			// the ID token Subject should be the Host URL plus the value pulled from the requested UserSearch.Attributes.UID attribute
 			wantDownstreamIDTokenSubjectToMatch: "^" + regexp.QuoteMeta(
 				"ldaps://"+env.SupervisorUpstreamActiveDirectory.Host+
@@ -831,7 +889,7 @@ func TestSupervisorLogin(t *testing.T) {
 					t.Skip("Active Directory hostname not specified")
 				}
 			},
-			createIDP: func(t *testing.T) {
+			createIDP: func(t *testing.T) string {
 				t.Helper()
 				secret := testlib.CreateTestSecret(t, env.SupervisorNamespace, "ad-service-account", v1.SecretTypeBasicAuth,
 					map[string]string{
@@ -854,6 +912,7 @@ func TestSupervisorLogin(t *testing.T) {
 					secret.Name, secret.ResourceVersion,
 				)
 				requireSuccessfulActiveDirectoryIdentityProviderConditions(t, adIDP, expectedMsg)
+				return adIDP.Name
 			},
 			requestAuthorization: func(t *testing.T, downstreamAuthorizeURL, _ string, httpClient *http.Client) {
 				requestAuthorizationUsingCLIPasswordFlow(t,
@@ -864,10 +923,93 @@ func TestSupervisorLogin(t *testing.T) {
 					true,
 				)
 			},
-			breakRefreshSessionData: nil, // upstream refresh not yet implemented for this IDP type
+			breakRefreshSessionData: nil,
 			wantErrorDescription:    "The resource owner or authorization server denied the request. Username/password not accepted by LDAP provider.",
 			wantErrorType:           "access_denied",
 		},
+		{
+			name: "ldap refresh fails when username changes from email as username to dn as username",
+			maybeSkip: func(t *testing.T) {
+				t.Helper()
+				if len(env.ToolsNamespace) == 0 && !env.HasCapability(testlib.CanReachInternetLDAPPorts) {
+					t.Skip("LDAP integration test requires connectivity to an LDAP server")
+				}
+			},
+			createIDP: func(t *testing.T) string {
+				t.Helper()
+				secret := testlib.CreateTestSecret(t, env.SupervisorNamespace, "ldap-service-account", v1.SecretTypeBasicAuth,
+					map[string]string{
+						v1.BasicAuthUsernameKey: env.SupervisorUpstreamLDAP.BindUsername,
+						v1.BasicAuthPasswordKey: env.SupervisorUpstreamLDAP.BindPassword,
+					},
+				)
+				ldapIDP := testlib.CreateTestLDAPIdentityProvider(t, idpv1alpha1.LDAPIdentityProviderSpec{
+					Host: env.SupervisorUpstreamLDAP.Host,
+					TLS: &idpv1alpha1.TLSSpec{
+						CertificateAuthorityData: base64.StdEncoding.EncodeToString([]byte(env.SupervisorUpstreamLDAP.CABundle)),
+					},
+					Bind: idpv1alpha1.LDAPIdentityProviderBind{
+						SecretName: secret.Name,
+					},
+					UserSearch: idpv1alpha1.LDAPIdentityProviderUserSearch{
+						Base:   env.SupervisorUpstreamLDAP.UserSearchBase,
+						Filter: "",
+						Attributes: idpv1alpha1.LDAPIdentityProviderUserSearchAttributes{
+							Username: env.SupervisorUpstreamLDAP.TestUserMailAttributeName,
+							UID:      env.SupervisorUpstreamLDAP.TestUserUniqueIDAttributeName,
+						},
+					},
+					GroupSearch: idpv1alpha1.LDAPIdentityProviderGroupSearch{
+						Base:   env.SupervisorUpstreamLDAP.GroupSearchBase,
+						Filter: "",
+						Attributes: idpv1alpha1.LDAPIdentityProviderGroupSearchAttributes{
+							GroupName: "dn",
+						},
+					},
+				}, idpv1alpha1.LDAPPhaseReady)
+				expectedMsg := fmt.Sprintf(
+					`successfully able to connect to "%s" and bind as user "%s" [validated with Secret "%s" at version "%s"]`,
+					env.SupervisorUpstreamLDAP.Host, env.SupervisorUpstreamLDAP.BindUsername,
+					secret.Name, secret.ResourceVersion,
+				)
+				requireSuccessfulLDAPIdentityProviderConditions(t, ldapIDP, expectedMsg)
+				return ldapIDP.Name
+			},
+			requestAuthorization: func(t *testing.T, downstreamAuthorizeURL, _ string, httpClient *http.Client) {
+				requestAuthorizationUsingCLIPasswordFlow(t,
+					downstreamAuthorizeURL,
+					env.SupervisorUpstreamLDAP.TestUserMailAttributeValue, // username to present to server during login
+					env.SupervisorUpstreamLDAP.TestUserPassword,           // password to present to server during login
+					httpClient,
+					false,
+				)
+			},
+			breakRefreshSessionData: func(t *testing.T, pinnipedSession *psession.PinnipedSession, idpName string) {
+				// get the idp, update the config.
+				client := testlib.NewSupervisorClientset(t)
+				ctx, cancel := context.WithTimeout(context.Background(), 5*time.Minute)
+				defer cancel()
+
+				// Create the LDAPIdentityProvider using GenerateName to get a random name.
+				upstreams := client.IDPV1alpha1().LDAPIdentityProviders(env.SupervisorNamespace)
+				ldapIDP, err := upstreams.Get(ctx, idpName, metav1.GetOptions{})
+				require.NoError(t, err)
+				ldapIDP.Spec.UserSearch.Attributes.Username = "dn"
+
+				_, err = upstreams.Update(ctx, ldapIDP, metav1.UpdateOptions{})
+				require.NoError(t, err)
+				time.Sleep(10 * time.Second) // wait for controllers to pick up the change
+			},
+			// the ID token Subject should be the Host URL plus the value pulled from the requested UserSearch.Attributes.UID attribute
+			wantDownstreamIDTokenSubjectToMatch: "^" + regexp.QuoteMeta(
+				"ldaps://"+env.SupervisorUpstreamLDAP.Host+
+					"?base="+url.QueryEscape(env.SupervisorUpstreamLDAP.UserSearchBase)+
+					"&sub="+base64.RawURLEncoding.EncodeToString([]byte(env.SupervisorUpstreamLDAP.TestUserUniqueIDAttributeValue)),
+			) + "$",
+			// the ID token Username should have been pulled from the requested UserSearch.Attributes.Username attribute
+			wantDownstreamIDTokenUsernameToMatch: "^" + regexp.QuoteMeta(env.SupervisorUpstreamLDAP.TestUserMailAttributeValue) + "$",
+			wantDownstreamIDTokenGroups:          env.SupervisorUpstreamLDAP.TestUserDirectGroupsDNs,
+		},
 	}
 	for _, test := range tests {
 		tt := test
@@ -1007,9 +1149,9 @@ func requireEventuallySuccessfulActiveDirectoryIdentityProviderConditions(t *tes
 
 func testSupervisorLogin(
 	t *testing.T,
-	createIDP func(t *testing.T),
+	createIDP func(t *testing.T) string,
 	requestAuthorization func(t *testing.T, downstreamAuthorizeURL, downstreamCallbackURL string, httpClient *http.Client),
-	breakRefreshSessionData func(t *testing.T, customSessionData *psession.CustomSessionData),
+	breakRefreshSessionData func(t *testing.T, pinnipedSession *psession.PinnipedSession, idpName string),
 	wantDownstreamIDTokenSubjectToMatch, wantDownstreamIDTokenUsernameToMatch string, wantDownstreamIDTokenGroups []string,
 	wantErrorDescription string, wantErrorType string,
 ) {
@@ -1097,7 +1239,7 @@ func testSupervisorLogin(
 	}, 30*time.Second, 200*time.Millisecond)
 
 	// Create upstream IDP and wait for it to become ready.
-	createIDP(t)
+	idpName := createIDP(t)
 
 	// Perform OIDC discovery for our downstream.
 	var discovery *coreosoidc.Provider
@@ -1191,7 +1333,7 @@ func testSupervisorLogin(
 			// Next mutate the part of the session that is used during upstream refresh.
 			pinnipedSession, ok := storedRefreshSession.GetSession().(*psession.PinnipedSession)
 			require.True(t, ok, "should have been able to cast session data to PinnipedSession")
-			breakRefreshSessionData(t, pinnipedSession.Custom)
+			breakRefreshSessionData(t, pinnipedSession, idpName)
 
 			// Then save the mutated Secret back to Kubernetes.
 			// There is no update function, so delete and create again at the same name.
@@ -1204,9 +1346,8 @@ func testSupervisorLogin(
 			require.Error(t, err)
 			require.Regexp(t,
 				regexp.QuoteMeta("oauth2: cannot fetch token: 401 Unauthorized\n")+
-					regexp.QuoteMeta(`Response: {"error":"error","error_description":"Error during upstream refresh. Upstream refresh failed using provider '`)+
+					regexp.QuoteMeta(`Response: {"error":"error","error_description":"Error during upstream refresh. Upstream refresh failed`)+
-					"[^']+"+ // this would be the name of the identity provider CR
+					"[^']+",
-					regexp.QuoteMeta(fmt.Sprintf(`' of type '%s'."`, pinnipedSession.Custom.ProviderType)),
 				err.Error(),
 			)
 		}