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internal/httputil: use error structs for http errors (#159)

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The existing implementation used a ErrorResponse method to propogate
and create http error messages. Since we added functionality to
troubleshoot, signout, and do other tasks following an http error
it's useful to use Error struct in place of method arguments.

This fixes #157 where a troubleshooting links were appearing on pages
that it didn't make sense on (e.g. pages without valid sessions).
This commit is contained in:
Bobby DeSimone 2019-06-03 20:00:37 -07:00 • committed by GitHub
parent 14403ce388
commit bade9f50e6
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GPG key ID: 4AEE18F83AFDEB23
9 changed files with 244 additions and 133 deletions
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76
authenticate/handlers.go
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@ -14,7 +14,7 @@ import (
"github.com/pomerium/pomerium/internal/sessions"
)
// CSPHeaders adds content security headers for authenticate's handlers
// CSPHeaders are the content security headers added to the service's handlers
var CSPHeaders = map[string]string{
"Content-Security-Policy": "default-src 'none'; style-src 'self'" +
" 'sha256-z9MsgkMbQjRSLxzAfN55jB3a9pP0PQ4OHFH8b4iDP6s=' " +
@ -80,36 +80,41 @@ func (a *Authenticate) SignIn(w http.ResponseWriter, r *http.Request) {
return
default:
log.FromRequest(r).Error().Err(err).Msg("proxy: unexpected error")
httputil.ErrorResponse(w, r, "An unexpected error occurred", http.StatusInternalServerError)
httpErr := &httputil.Error{Message: "An unexpected error occurred", Code: http.StatusInternalServerError}
httputil.ErrorResponse(w, r, httpErr)
return
}
}
err = a.authenticate(w, r, session)
if err != nil {
httputil.ErrorResponse(w, r, err.Error(), http.StatusInternalServerError)
httpErr := &httputil.Error{Message: err.Error(), Code: http.StatusInternalServerError}
httputil.ErrorResponse(w, r, httpErr)
return
}
err = r.ParseForm()
if err != nil {
httputil.ErrorResponse(w, r, err.Error(), http.StatusInternalServerError)
if err = r.ParseForm(); err != nil {
httpErr := &httputil.Error{Message: err.Error(), Code: http.StatusInternalServerError}
httputil.ErrorResponse(w, r, httpErr)
return
}
// original `state` parameter received from the proxy application.
state := r.Form.Get("state")
if state == "" {
httputil.ErrorResponse(w, r, "no state parameter supplied", http.StatusBadRequest)
httpErr := &httputil.Error{Message: "no state parameter supplied", Code: http.StatusBadRequest}
httputil.ErrorResponse(w, r, httpErr)
return
}
redirectURL, err := url.Parse(r.Form.Get("redirect_uri"))
if err != nil {
httputil.ErrorResponse(w, r, "malformed redirect_uri parameter passed", http.StatusBadRequest)
httpErr := &httputil.Error{Message: "malformed redirect_uri parameter passed", Code: http.StatusBadRequest}
httputil.ErrorResponse(w, r, httpErr)
return
}
// encrypt session state as json blob
encrypted, err := sessions.MarshalSession(session, a.cipher)
if err != nil {
httputil.ErrorResponse(w, r, err.Error(), http.StatusInternalServerError)
httpErr := &httputil.Error{Message: err.Error(), Code: http.StatusInternalServerError}
httputil.ErrorResponse(w, r, httpErr)
return
}
http.Redirect(w, r, getAuthCodeRedirectURL(redirectURL, state, string(encrypted)), http.StatusFound)
@ -130,9 +135,10 @@ func getAuthCodeRedirectURL(redirectURL *url.URL, state, authCode string) string
// SignOut signs the user out by trying to revoke the user's remote identity session along with
// the associated local session state. Handles both GET and POST.
func (a *Authenticate) SignOut(w http.ResponseWriter, r *http.Request) {
err := r.ParseForm()
if err != nil {
httputil.ErrorResponse(w, r, err.Error(), http.StatusInternalServerError)
if err := r.ParseForm(); err != nil {
log.Error().Err(err).Msg("authenticate: error SignOut form")
httpErr := &httputil.Error{Code: http.StatusInternalServerError}
httputil.ErrorResponse(w, r, httpErr)
return
}
redirectURI := r.Form.Get("redirect_uri")
@ -146,7 +152,8 @@ func (a *Authenticate) SignOut(w http.ResponseWriter, r *http.Request) {
err = a.provider.Revoke(session.AccessToken)
if err != nil {
log.Error().Err(err).Msg("authenticate: failed to revoke user session")
httputil.ErrorResponse(w, r, fmt.Sprintf("could not revoke session: %s ", err.Error()), http.StatusBadRequest)
httpErr := &httputil.Error{Message: fmt.Sprintf("could not revoke session: %s ", err.Error()), Code: http.StatusBadRequest}
httputil.ErrorResponse(w, r, httpErr)
return
}
http.Redirect(w, r, redirectURI, http.StatusFound)
@ -163,14 +170,16 @@ func (a *Authenticate) OAuthStart(w http.ResponseWriter, r *http.Request) {
// verify redirect uri is from the root domain
if !middleware.SameDomain(authRedirectURL, a.RedirectURL) {
httputil.ErrorResponse(w, r, "Invalid redirect parameter: redirect uri not from the root domain", http.StatusBadRequest)
httpErr := &httputil.Error{Message: "Invalid redirect parameter: redirect uri not from the root domain", Code: http.StatusBadRequest}
httputil.ErrorResponse(w, r, httpErr)
return
}
// verify proxy url is from the root domain
proxyRedirectURL, err := url.Parse(authRedirectURL.Query().Get("redirect_uri"))
if err != nil || !middleware.SameDomain(proxyRedirectURL, a.RedirectURL) {
httputil.ErrorResponse(w, r, "Invalid redirect parameter: proxy url not from the root domain", http.StatusBadRequest)
httpErr := &httputil.Error{Message: "Invalid redirect parameter: proxy url not from the root domain", Code: http.StatusBadRequest}
httputil.ErrorResponse(w, r, httpErr)
return
}
@ -178,7 +187,8 @@ func (a *Authenticate) OAuthStart(w http.ResponseWriter, r *http.Request) {
proxyRedirectSig := authRedirectURL.Query().Get("sig")
ts := authRedirectURL.Query().Get("ts")
if !middleware.ValidSignature(proxyRedirectURL.String(), proxyRedirectSig, ts, a.SharedKey) {
httputil.ErrorResponse(w, r, "Invalid redirect parameter: invalid signature", http.StatusBadRequest)
httpErr := &httputil.Error{Message: "Invalid redirect parameter: invalid signature", Code: http.StatusBadRequest}
httputil.ErrorResponse(w, r, httpErr)
return
}
@ -197,36 +207,36 @@ func (a *Authenticate) OAuthCallback(w http.ResponseWriter, r *http.Request) {
switch h := err.(type) {
case nil:
break
case httputil.HTTPError:
case httputil.Error:
log.Error().Err(err).Msg("authenticate: oauth callback error")
httputil.ErrorResponse(w, r, h.Message, h.Code)
httpErr := &httputil.Error{Message: h.Message, Code: h.Code}
httputil.ErrorResponse(w, r, httpErr)
return
default:
log.Error().Err(err).Msg("authenticate: unexpected oauth callback error")
httputil.ErrorResponse(w, r, "Internal Error", http.StatusInternalServerError)
httpErr := &httputil.Error{Message: "Internal Error", Code: http.StatusInternalServerError}
httputil.ErrorResponse(w, r, httpErr)
return
}
// redirect back to the proxy-service via sign_in
log.Info().Interface("redirect", redirect).Msg("proxy: OAuthCallback")
http.Redirect(w, r, redirect, http.StatusFound)
}
// getOAuthCallback completes the oauth cycle from an identity provider's callback
func (a *Authenticate) getOAuthCallback(w http.ResponseWriter, r *http.Request) (string, error) {
// handle the callback response from the identity provider
err := r.ParseForm()
if err != nil {
return "", httputil.HTTPError{Code: http.StatusInternalServerError, Message: err.Error()}
if err := r.ParseForm(); err != nil {
return "", httputil.Error{Code: http.StatusInternalServerError, Message: err.Error()}
}
errorString := r.Form.Get("error")
if errorString != "" {
log.FromRequest(r).Error().Str("Error", errorString).Msg("authenticate: provider returned error")
return "", httputil.HTTPError{Code: http.StatusForbidden, Message: errorString}
return "", httputil.Error{Code: http.StatusForbidden, Message: errorString}
}
code := r.Form.Get("code")
if code == "" {
log.FromRequest(r).Error().Err(err).Msg("authenticate: provider missing code")
return "", httputil.HTTPError{Code: http.StatusBadRequest, Message: "Missing Code"}
log.FromRequest(r).Error().Msg("authenticate: provider missing code")
return "", httputil.Error{Code: http.StatusBadRequest, Message: "Missing Code"}
}
@ -234,18 +244,18 @@ func (a *Authenticate) getOAuthCallback(w http.ResponseWriter, r *http.Request)
session, err := a.provider.Authenticate(code)
if err != nil {
log.FromRequest(r).Error().Err(err).Msg("authenticate: error redeeming authenticate code")
return "", httputil.HTTPError{Code: http.StatusInternalServerError, Message: err.Error()}
return "", httputil.Error{Code: http.StatusInternalServerError, Message: err.Error()}
}
// okay, time to go back to the proxy service.
bytes, err := base64.URLEncoding.DecodeString(r.Form.Get("state"))
if err != nil {
log.FromRequest(r).Error().Err(err).Msg("authenticate: failed decoding state")
return "", httputil.HTTPError{Code: http.StatusBadRequest, Message: "Couldn't decode state"}
return "", httputil.Error{Code: http.StatusBadRequest, Message: "Couldn't decode state"}
}
s := strings.SplitN(string(bytes), ":", 2)
if len(s) != 2 {
return "", httputil.HTTPError{Code: http.StatusBadRequest, Message: "Invalid State"}
return "", httputil.Error{Code: http.StatusBadRequest, Message: "Invalid State"}
}
nonce := s[0]
redirect := s[1]
@ -253,22 +263,22 @@ func (a *Authenticate) getOAuthCallback(w http.ResponseWriter, r *http.Request)
defer a.csrfStore.ClearCSRF(w, r)
if err != nil || c.Value != nonce {
log.FromRequest(r).Error().Err(err).Msg("authenticate: csrf failure")
return "", httputil.HTTPError{Code: http.StatusForbidden, Message: "CSRF failed"}
return "", httputil.Error{Code: http.StatusForbidden, Message: "CSRF failed"}
}
redirectURL, err := url.Parse(redirect)
if err != nil {
log.FromRequest(r).Error().Err(err).Msg("authenticate: malformed redirect url")
return "", httputil.HTTPError{Code: http.StatusForbidden, Message: "Malformed redirect url"}
return "", httputil.Error{Code: http.StatusForbidden, Message: "Malformed redirect url"}
}
// sanity check, we are redirecting back to the same subdomain right?
if !middleware.SameDomain(redirectURL, a.RedirectURL) {
return "", httputil.HTTPError{Code: http.StatusBadRequest, Message: "Invalid Redirect URI domain"}
return "", httputil.Error{Code: http.StatusBadRequest, Message: "Invalid Redirect URI domain"}
}
err = a.sessionStore.SaveSession(w, r, session)
if err != nil {
log.Error().Err(err).Msg("authenticate: failed saving new session")
return "", httputil.HTTPError{Code: http.StatusInternalServerError, Message: "Internal Error"}
return "", httputil.Error{Code: http.StatusInternalServerError, Message: "Internal Error"}
}
return redirect, nil