mix
f2fc07fafa
Resolves plan item A.1 (option б): login/setup rate-limiting used RemoteAddr only, which behind the default reverse proxy is the proxy's own address, making the limiter effectively global and enabling a lockout-DoS. Now, when the request's direct peer matches the new TRUSTED_PROXY_CIDR list (comma-separated CIDRs, env, empty by default), the last X-Forwarded-For entry is used instead, giving a real per-client limit. Unset behaviour is unchanged. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
114 lines
3.2 KiB
Go
114 lines
3.2 KiB
Go
package web
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import (
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"errors"
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"net/http"
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"strings"
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"codeberg.org/mix/selfpost/internal/store"
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"golang.org/x/crypto/bcrypt"
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)
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// sessionCookie is the name of the panel session cookie.
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const sessionCookie = "selfpost_session"
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// handleLogin serves the login form (GET) and authenticates (POST). Until an
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// administrator exists there is nobody to log in, so it points at setup.
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func (s *Server) handleLogin(w http.ResponseWriter, r *http.Request) {
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exists, err := s.store.AdminExists()
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if err != nil {
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http.Error(w, "internal error", http.StatusInternalServerError)
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return
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}
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if !exists {
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// No admin yet: login is meaningless. Send a clear message rather than
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// a failing form.
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s.render(w, http.StatusOK, "login", map[string]any{
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"Title": "SelfPost — Sign in",
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"SetupHint": true,
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})
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return
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}
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switch r.Method {
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case http.MethodGet:
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s.renderLogin(w, http.StatusOK, "")
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case http.MethodPost:
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s.submitLogin(w, r)
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default:
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w.Header().Set("Allow", "GET, POST")
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http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
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}
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}
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func (s *Server) renderLogin(w http.ResponseWriter, status int, formErr string) {
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s.render(w, status, "login", map[string]any{
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"Title": "SelfPost — Sign in",
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"Error": formErr,
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})
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}
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func (s *Server) submitLogin(w http.ResponseWriter, r *http.Request) {
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// Brute-force throttle by client IP (spec 7.6.5).
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if !s.loginLimiter.Allow(clientIP(r, s.trustedProxies)) {
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s.renderLogin(w, http.StatusTooManyRequests, "Too many attempts. Please wait and try again.")
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return
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}
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if err := r.ParseForm(); err != nil {
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s.renderLogin(w, http.StatusBadRequest, "Invalid form submission.")
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return
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}
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username := strings.TrimSpace(r.PostFormValue("username"))
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password := r.PostFormValue("password")
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admin, err := s.store.GetAdmin()
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if err != nil {
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if !errors.Is(err, store.ErrNoAdmin) {
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logf("panel: login: get admin failed: %v", err)
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}
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s.renderLogin(w, http.StatusUnauthorized, "Invalid username or password.")
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return
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}
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// Always run bcrypt so timing does not distinguish "wrong user" from
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// "wrong password", and compare the username too.
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pwErr := bcrypt.CompareHashAndPassword([]byte(admin.PasswordHash), []byte(password))
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if username != admin.Username || pwErr != nil {
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s.renderLogin(w, http.StatusUnauthorized, "Invalid username or password.")
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return
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}
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token := s.sessions.Create(admin.Username)
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http.SetCookie(w, &http.Cookie{
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Name: sessionCookie,
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Value: token,
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Path: "/",
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HttpOnly: true,
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Secure: s.cfg.CookieSecure,
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SameSite: http.SameSiteLaxMode,
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})
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http.Redirect(w, r, "/", http.StatusSeeOther)
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}
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// handleLogout destroys the session and clears the cookie.
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func (s *Server) handleLogout(w http.ResponseWriter, r *http.Request) {
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if r.Method != http.MethodPost {
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w.Header().Set("Allow", "POST")
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http.Error(w, "method not allowed", http.StatusMethodNotAllowed)
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return
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}
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if c, err := r.Cookie(sessionCookie); err == nil {
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s.sessions.Destroy(c.Value)
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}
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http.SetCookie(w, &http.Cookie{
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Name: sessionCookie,
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Value: "",
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Path: "/",
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MaxAge: -1,
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HttpOnly: true,
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Secure: s.cfg.CookieSecure,
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SameSite: http.SameSiteLaxMode,
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})
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http.Redirect(w, r, "/login", http.StatusSeeOther)
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}
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