mirror of
https://github.com/nais/wonderwall.git
synced 2026-05-09 01:47:03 +00:00
111 lines
3.2 KiB
Go
111 lines
3.2 KiB
Go
package router
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import (
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"context"
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"fmt"
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"net/http"
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"time"
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"github.com/lestrrat-go/jwx/jwt"
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"golang.org/x/oauth2"
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"github.com/nais/wonderwall/pkg/openid"
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)
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func (h *Handler) Callback(w http.ResponseWriter, r *http.Request) {
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loginCookie, err := h.getLoginCookie(r)
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if err != nil {
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h.Unauthorized(w, r, fmt.Errorf("callback: fetching login cookie: %w", err))
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return
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}
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params := r.URL.Query()
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if params.Get("error") != "" {
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oauthError := params.Get("error")
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oauthErrorDescription := params.Get("error_description")
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h.Unauthorized(w, r, fmt.Errorf("callback: error from identity provider: %s: %s", oauthError, oauthErrorDescription))
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return
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}
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if params.Get("state") != loginCookie.State {
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h.Unauthorized(w, r, fmt.Errorf("callback: state parameter mismatch"))
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return
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}
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tokens, err := h.codeExchangeForToken(r.Context(), loginCookie, params.Get("code"))
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if err != nil {
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h.InternalError(w, r, fmt.Errorf("callback: exchanging code: %w", err))
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return
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}
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jwkSet := h.Provider.GetPublicJwkSet()
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idToken, err := openid.ParseIDToken(*jwkSet, tokens)
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if err != nil {
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h.InternalError(w, r, fmt.Errorf("callback: parsing id_token: %w", err))
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return
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}
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externalSessionID, err := h.validateIDToken(idToken, loginCookie)
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if err != nil {
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h.InternalError(w, r, fmt.Errorf("callback: validating id_token: %w", err))
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return
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}
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err = h.createSession(w, r, externalSessionID, tokens, idToken)
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if err != nil {
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h.InternalError(w, r, fmt.Errorf("callback: creating session: %w", err))
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return
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}
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// delete login cookie as we no longer need it
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h.deleteCookie(w, h.GetLoginCookieName())
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http.Redirect(w, r, loginCookie.Referer, http.StatusTemporaryRedirect)
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}
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func (h *Handler) codeExchangeForToken(ctx context.Context, loginCookie *openid.LoginCookie, code string) (*oauth2.Token, error) {
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clientAssertion, err := openid.ClientAssertion(h.Provider, time.Second*30)
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if err != nil {
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return nil, fmt.Errorf("creating client assertion: %w", err)
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}
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opts := []oauth2.AuthCodeOption{
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oauth2.SetAuthURLParam("code_verifier", loginCookie.CodeVerifier),
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oauth2.SetAuthURLParam("client_assertion", clientAssertion),
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oauth2.SetAuthURLParam("client_assertion_type", "urn:ietf:params:oauth:client-assertion-type:jwt-bearer"),
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}
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tokens, err := h.OauthConfig.Exchange(ctx, code, opts...)
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if err != nil {
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return nil, fmt.Errorf("exchanging code for token: %w", err)
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}
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return tokens, nil
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}
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func (h *Handler) validateIDToken(idToken *openid.IDToken, loginCookie *openid.LoginCookie) (string, error) {
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validateOpts := []jwt.ValidateOption{
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jwt.WithAudience(h.Provider.GetClientConfiguration().GetClientID()),
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jwt.WithClaimValue("nonce", loginCookie.Nonce),
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jwt.WithIssuer(h.Provider.GetOpenIDConfiguration().Issuer),
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jwt.WithAcceptableSkew(5 * time.Second),
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jwt.WithRequiredClaim("sid"),
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}
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if len(h.Provider.GetClientConfiguration().GetACRValues()) > 0 {
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validateOpts = append(validateOpts, jwt.WithRequiredClaim("acr"))
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}
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err := idToken.Validate(validateOpts...)
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if err != nil {
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return "", err
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}
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externalSessionID, err := idToken.GetSID()
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if err != nil {
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return "", fmt.Errorf("getting external session ID from id_token: %w", err)
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}
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return externalSessionID, nil
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}
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