95 lines
3.2 KiB
Go
95 lines
3.2 KiB
Go
// GoToSocial
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// Copyright (C) GoToSocial Authors admin@gotosocial.org
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// SPDX-License-Identifier: AGPL-3.0-or-later
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//
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// This program is free software: you can redistribute it and/or modify
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// it under the terms of the GNU Affero General Public License as published by
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// the Free Software Foundation, either version 3 of the License, or
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// (at your option) any later version.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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// GNU Affero General Public License for more details.
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//
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// You should have received a copy of the GNU Affero General Public License
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// along with this program. If not, see <http://www.gnu.org/licenses/>.
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package middleware
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import (
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"fmt"
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"net/http"
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"net/url"
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"strings"
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"github.com/gin-contrib/sessions"
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"github.com/gin-contrib/sessions/memstore"
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"github.com/gin-gonic/gin"
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"github.com/superseriousbusiness/gotosocial/internal/config"
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"github.com/superseriousbusiness/gotosocial/internal/log"
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"golang.org/x/net/idna"
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)
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// SessionOptions returns the standard set of options to use for each session.
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func SessionOptions() sessions.Options {
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var samesite http.SameSite
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switch strings.TrimSpace(strings.ToLower(config.GetAdvancedCookiesSamesite())) {
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case "lax":
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samesite = http.SameSiteLaxMode
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case "strict":
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samesite = http.SameSiteStrictMode
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default:
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log.Warnf(nil, "%s set to %s which is not recognized, defaulting to 'lax'", config.AdvancedCookiesSamesiteFlag(), config.GetAdvancedCookiesSamesite())
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samesite = http.SameSiteLaxMode
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}
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return sessions.Options{
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Path: "/",
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Domain: config.GetHost(),
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// 2 minutes
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MaxAge: 120,
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// only set secure over https
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Secure: config.GetProtocol() == "https",
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// forbid javascript from inspecting cookie
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HttpOnly: true,
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// https://datatracker.ietf.org/doc/html/draft-ietf-httpbis-cookie-same-site-00#section-4.1.1
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SameSite: samesite,
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}
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}
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// SessionName is a utility function that derives an appropriate session name from the hostname.
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func SessionName() (string, error) {
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// parse the protocol + host
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protocol := config.GetProtocol()
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host := config.GetHost()
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u, err := url.Parse(fmt.Sprintf("%s://%s", protocol, host))
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if err != nil {
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return "", err
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}
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// take the hostname without any port attached
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strippedHostname := u.Hostname()
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if strippedHostname == "" {
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return "", fmt.Errorf("could not derive hostname without port from %s://%s", protocol, host)
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}
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// make sure IDNs are converted to punycode or the cookie library breaks:
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// see https://en.wikipedia.org/wiki/Punycode
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punyHostname, err := idna.New().ToASCII(strippedHostname)
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if err != nil {
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return "", fmt.Errorf("could not convert %s to punycode: %s", strippedHostname, err)
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}
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return fmt.Sprintf("gotosocial-%s", punyHostname), nil
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}
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// Session returns a new gin middleware that implements session cookies using the given
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// sessionName, authentication key, and encryption key. Session name can be derived from the
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// SessionName utility function in this package.
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func Session(sessionName string, auth []byte, crypt []byte) gin.HandlerFunc {
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store := memstore.NewStore(auth, crypt)
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store.Options(SessionOptions())
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return sessions.Sessions(sessionName, store)
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}
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