93 lines
5.1 KiB
Go
93 lines
5.1 KiB
Go
// Copyright 2022-2023 the Pinniped contributors. All Rights Reserved.
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// SPDX-License-Identifier: Apache-2.0
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package login
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import (
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"net/http"
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"net/url"
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"github.com/ory/fosite"
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"go.pinniped.dev/internal/httputil/httperr"
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"go.pinniped.dev/internal/oidc"
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"go.pinniped.dev/internal/oidc/downstreamsession"
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"go.pinniped.dev/internal/plog"
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)
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func NewPostHandler(issuerURL string, upstreamIDPs oidc.UpstreamIdentityProvidersLister, oauthHelper fosite.OAuth2Provider) HandlerFunc {
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return func(w http.ResponseWriter, r *http.Request, encodedState string, decodedState *oidc.UpstreamStateParamData) error {
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// Note that the login handler prevents this handler from being called with OIDC upstreams.
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_, ldapUpstream, idpType, err := oidc.FindUpstreamIDPByNameAndType(upstreamIDPs, decodedState.UpstreamName, decodedState.UpstreamType)
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if err != nil {
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// This shouldn't normally happen because the authorization endpoint ensured that this provider existed
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// at that time. It would be possible in the unlikely event that the provider was deleted during the login.
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plog.Error("error finding upstream provider", err)
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return httperr.Wrap(http.StatusUnprocessableEntity, "error finding upstream provider", err)
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}
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// Get the original params that were used at the authorization endpoint.
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downstreamAuthParams, err := url.ParseQuery(decodedState.AuthParams)
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if err != nil {
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// This shouldn't really happen because the authorization endpoint encoded these query params correctly.
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plog.Error("error reading state downstream auth params", err)
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return httperr.New(http.StatusBadRequest, "error reading state downstream auth params")
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}
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// Recreate enough of the original authorize request so we can pass it to NewAuthorizeRequest().
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reconstitutedAuthRequest := &http.Request{Form: downstreamAuthParams}
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authorizeRequester, err := oauthHelper.NewAuthorizeRequest(r.Context(), reconstitutedAuthRequest)
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if err != nil {
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// This shouldn't really happen because the authorization endpoint has already validated these params
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// by calling NewAuthorizeRequest() itself.
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plog.Error("error using state downstream auth params", err,
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"fositeErr", oidc.FositeErrorForLog(err))
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return httperr.New(http.StatusBadRequest, "error using state downstream auth params")
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}
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// Automatically grant certain scopes, but only if they were requested.
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// This is instead of asking the user to approve these scopes. Note that `NewAuthorizeRequest` would have returned
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// an error if the client requested a scope that they are not allowed to request, so we don't need to worry about that here.
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downstreamsession.AutoApproveScopes(authorizeRequester)
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// Get the username and password form params from the POST body.
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username := r.PostFormValue(usernameParamName)
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password := r.PostFormValue(passwordParamName)
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// Treat blank username or password as a bad username/password combination, as opposed to an internal error.
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if username == "" || password == "" {
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// User forgot to enter one of the required fields.
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// The user may try to log in again if they'd like, so redirect back to the login page with an error.
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return RedirectToLoginPage(r, w, issuerURL, encodedState, ShowBadUserPassErr)
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}
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// Attempt to authenticate the user with the upstream IDP.
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authenticateResponse, authenticated, err := ldapUpstream.AuthenticateUser(r.Context(), username, password, authorizeRequester.GetGrantedScopes())
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if err != nil {
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plog.WarningErr("unexpected error during upstream LDAP authentication", err, "upstreamName", ldapUpstream.GetName())
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// There was some problem during authentication with the upstream, aside from bad username/password.
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// The user may try to log in again if they'd like, so redirect back to the login page with an error.
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return RedirectToLoginPage(r, w, issuerURL, encodedState, ShowInternalError)
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}
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if !authenticated {
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// The upstream did not accept the username/password combination.
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// The user may try to log in again if they'd like, so redirect back to the login page with an error.
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return RedirectToLoginPage(r, w, issuerURL, encodedState, ShowBadUserPassErr)
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}
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// We had previously interrupted the regular steps of the OIDC authcode flow to show the login page UI.
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// Now the upstream IDP has authenticated the user, so now we're back into the regular OIDC authcode flow steps.
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// Both success and error responses from this point onwards should look like the usual fosite redirect
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// responses, and a happy redirect response will include a downstream authcode.
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subject := downstreamsession.DownstreamSubjectFromUpstreamLDAP(ldapUpstream, authenticateResponse)
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username = authenticateResponse.User.GetName()
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groups := authenticateResponse.User.GetGroups()
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customSessionData := downstreamsession.MakeDownstreamLDAPOrADCustomSessionData(ldapUpstream, idpType, authenticateResponse, username)
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openIDSession := downstreamsession.MakeDownstreamSession(subject, username, groups,
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authorizeRequester.GetGrantedScopes(), authorizeRequester.GetClient().GetID(), customSessionData, map[string]interface{}{})
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oidc.PerformAuthcodeRedirect(r, w, oauthHelper, authorizeRequester, openIDSession, false)
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return nil
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}
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}
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