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replace http basic auth for web interfaces with session cookie & csrf-based auth

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the http basic auth we had was very simple to reason about, and to implement.
but it has a major downside:

there is no way to logout, browsers keep sending credentials. ideally, browsers
themselves would show a button to stop sending credentials.

a related downside: the http auth mechanism doesn't indicate for which server
paths the credentials are.

another downside: the original password is sent to the server with each
request. though sending original passwords to web servers seems to be
considered normal.

our new approach uses session cookies, along with csrf values when we can. the
sessions are server-side managed, automatically extended on each use. this
makes it easy to invalidate sessions and keeps the frontend simpler (than with
long- vs short-term sessions and refreshing). the cookies are httponly,
samesite=strict, scoped to the path of the web interface. cookies are set
"secure" when set over https. the cookie is set by a successful call to Login.
a call to Logout invalidates a session. changing a password invalidates all
sessions for a user, but keeps the session with which the password was changed
alive. the csrf value is also random, and associated with the session cookie.
the csrf must be sent as header for api calls, or as parameter for direct form
posts (where we cannot set a custom header). rest-like calls made directly by
the browser, e.g. for images, don't have a csrf protection. the csrf value is
returned by the Login api call and stored in localstorage.

api calls without credentials return code "user:noAuth", and with bad
credentials return "user:badAuth". the api client recognizes this and triggers
a login. after a login, all auth-failed api calls are automatically retried.
only for "user:badAuth" is an error message displayed in the login form (e.g.
session expired).

in an ideal world, browsers would take care of most session management. a
server would indicate authentication is needed (like http basic auth), and the
browsers uses trusted ui to request credentials for the server & path. the
browser could use safer mechanism than sending original passwords to the
server, such as scram, along with a standard way to create sessions.  for now,
web developers have to do authentication themselves: from showing the login
prompt, ensuring the right session/csrf cookies/localstorage/headers/etc are
sent with each request.

webauthn is a newer way to do authentication, perhaps we'll implement it in the
future. though hardware tokens aren't an attractive option for many users, and
it may be overkill as long as we still do old-fashioned authentication in smtp
& imap where passwords can be sent to the server.

for issue #58
This commit is contained in:
Mechiel Lukkien
2024-01-04 13:10:48 +01:00
parent c930a400be
commit 0f8bf2f220
50 changed files with 3560 additions and 832 deletions
Download Patch File Download Diff File Expand all files Collapse all files

80
webmail/webmail.go
View File

@ -38,25 +38,23 @@ import (
"github.com/mjl-/mox/mox-"
"github.com/mjl-/mox/moxio"
"github.com/mjl-/mox/store"
"github.com/mjl-/mox/webaccount"
"github.com/mjl-/mox/webauth"
)
func init() {
mox.LimitersInit()
}
var pkglog = mlog.New("webmail", nil)
type ctxKey string
// We pass the request to the sherpa handler so the TLS info can be used for
// the Received header in submitted messages. Most API calls need just the
// account name.
type ctxKey string
var requestInfoCtxKey ctxKey = "requestInfo"
type requestInfo struct {
LoginAddress string
AccountName string
SessionToken store.SessionToken
Response http.ResponseWriter
Request *http.Request // For Proto and TLS connection state during message submit.
}
@ -171,19 +169,19 @@ func serveContentFallback(log mlog.Log, w http.ResponseWriter, r *http.Request,
}
// Handler returns a handler for the webmail endpoints, customized for the max
// message size coming from the listener.
func Handler(maxMessageSize int64) func(w http.ResponseWriter, r *http.Request) {
sh, err := makeSherpaHandler(maxMessageSize)
// message size coming from the listener and cookiePath.
func Handler(maxMessageSize int64, cookiePath string, isForwarded bool) func(w http.ResponseWriter, r *http.Request) {
sh, err := makeSherpaHandler(maxMessageSize, cookiePath, isForwarded)
return func(w http.ResponseWriter, r *http.Request) {
if err != nil {
http.Error(w, "500 - internal server error - cannot handle requests", http.StatusInternalServerError)
return
}
handle(sh, w, r)
handle(sh, isForwarded, w, r)
}
}
func handle(apiHandler http.Handler, w http.ResponseWriter, r *http.Request) {
func handle(apiHandler http.Handler, isForwarded bool, w http.ResponseWriter, r *http.Request) {
ctx := r.Context()
log := pkglog.WithContext(ctx).With(slog.String("userauth", ""))
@ -195,17 +193,6 @@ func handle(apiHandler http.Handler, w http.ResponseWriter, r *http.Request) {
return
}
// HTTP Basic authentication for all requests.
loginAddress, accName := webaccount.CheckAuth(ctx, log, "webmail", w, r)
if accName == "" {
// Error response already sent.
return
}
if lw, ok := w.(interface{ AddAttr(a slog.Attr) }); ok {
lw.AddAttr(slog.String("authaccount", accName))
}
defer func() {
x := recover()
if x == nil {
@ -230,13 +217,14 @@ func handle(apiHandler http.Handler, w http.ResponseWriter, r *http.Request) {
switch r.URL.Path {
case "/":
switch r.Method {
case "GET", "HEAD":
h := w.Header()
h.Set("X-Frame-Options", "deny")
h.Set("Referrer-Policy", "same-origin")
webmailFile.Serve(ctx, log, w, r)
default:
http.Error(w, "405 - method not allowed - use get", http.StatusMethodNotAllowed)
return
case "GET", "HEAD":
}
webmailFile.Serve(ctx, log, w, r)
return
case "/msg.js", "/text.js":
@ -258,9 +246,27 @@ func handle(apiHandler http.Handler, w http.ResponseWriter, r *http.Request) {
return
}
// API calls.
if strings.HasPrefix(r.URL.Path, "/api/") {
reqInfo := requestInfo{loginAddress, accName, r}
isAPI := strings.HasPrefix(r.URL.Path, "/api/")
// Only allow POST for calls, they will not work cross-domain without CORS.
if isAPI && r.URL.Path != "/api/" && r.Method != "POST" {
http.Error(w, "405 - method not allowed - use post", http.StatusMethodNotAllowed)
return
}
var loginAddress, accName string
var sessionToken store.SessionToken
// All other URLs, except the login endpoint require some authentication.
if r.URL.Path != "/api/LoginPrep" && r.URL.Path != "/api/Login" {
var ok bool
accName, sessionToken, loginAddress, ok = webauth.Check(ctx, log, webauth.Accounts, "webmail", isForwarded, w, r, isAPI, isAPI, false)
if !ok {
// Response has been written already.
return
}
}
if isAPI {
reqInfo := requestInfo{loginAddress, accName, sessionToken, w, r}
ctx = context.WithValue(ctx, requestInfoCtxKey, reqInfo)
apiHandler.ServeHTTP(w, r.WithContext(ctx))
return
@ -412,7 +418,7 @@ func handle(apiHandler http.Handler, w http.ResponseWriter, r *http.Request) {
headers(false, false, false)
h.Set("Content-Type", "application/zip")
h.Set("Cache-Control", "no-cache, max-age=0")
h.Set("Cache-Control", "no-store, max-age=0")
var subjectSlug string
if p.Envelope != nil {
s := p.Envelope.Subject
@ -537,7 +543,7 @@ func handle(apiHandler http.Handler, w http.ResponseWriter, r *http.Request) {
params["charset"] = charset
}
h.Set("Content-Type", mime.FormatMediaType(ct, params))
h.Set("Cache-Control", "no-cache, max-age=0")
h.Set("Cache-Control", "no-store, max-age=0")
_, err := io.Copy(w, &moxio.AtReader{R: msgr})
log.Check(err, "writing raw")
@ -567,7 +573,7 @@ func handle(apiHandler http.Handler, w http.ResponseWriter, r *http.Request) {
allowSelfScript := true
headers(sameorigin, loadExternal, allowSelfScript)
h.Set("Content-Type", "text/html; charset=utf-8")
h.Set("Cache-Control", "no-cache, max-age=0")
h.Set("Cache-Control", "no-store, max-age=0")
path := filepath.FromSlash("webmail/msg.html")
fallback := webmailmsgHTML
@ -600,7 +606,7 @@ func handle(apiHandler http.Handler, w http.ResponseWriter, r *http.Request) {
headers(false, false, false)
h.Set("Content-Type", "application/javascript; charset=utf-8")
h.Set("Cache-Control", "no-cache, max-age=0")
h.Set("Cache-Control", "no-store, max-age=0")
_, err = fmt.Fprintf(w, "window.messageItem = %s;\nwindow.parsedMessage = %s;\n", mijson, pmjson)
log.Check(err, "writing parsedmessage.js")
@ -632,7 +638,7 @@ func handle(apiHandler http.Handler, w http.ResponseWriter, r *http.Request) {
allowSelfScript := true
headers(sameorigin, false, allowSelfScript)
h.Set("Content-Type", "text/html; charset=utf-8")
h.Set("Cache-Control", "no-cache, max-age=0")
h.Set("Cache-Control", "no-store, max-age=0")
// We typically return the embedded file, but during development it's handy to load
// from disk.
@ -659,7 +665,7 @@ func handle(apiHandler http.Handler, w http.ResponseWriter, r *http.Request) {
headers(sameorigin, allowExternal, false)
h.Set("Content-Type", "text/html; charset=utf-8")
h.Set("Cache-Control", "no-cache, max-age=0")
h.Set("Cache-Control", "no-store, max-age=0")
}
// todo: skip certain html parts? e.g. with content-disposition: attachment?
@ -726,7 +732,7 @@ func handle(apiHandler http.Handler, w http.ResponseWriter, r *http.Request) {
ct = strings.ToLower(ap.MediaType + "/" + ap.MediaSubType)
}
h.Set("Content-Type", ct)
h.Set("Cache-Control", "no-cache, max-age=0")
h.Set("Cache-Control", "no-store, max-age=0")
if t[1] == "download" {
name := tryDecodeParam(log, ap.ContentTypeParams["name"])
if name == "" {