mirror of
https://github.com/superseriousbusiness/gotosocial.git
synced 2025-10-30 21:52:31 -05:00
5e368d3089* [bugfix] CSP policy fixes for S3 in non-proxied mode * It should be img-src * In both img-src and media-src we still need to include 'self'
97 lines
3.1 KiB
Go
97 lines
3.1 KiB
Go
// GoToSocial
|
|
// Copyright (C) GoToSocial Authors admin@gotosocial.org
|
|
// SPDX-License-Identifier: AGPL-3.0-or-later
|
|
//
|
|
// This program is free software: you can redistribute it and/or modify
|
|
// it under the terms of the GNU Affero General Public License as published by
|
|
// the Free Software Foundation, either version 3 of the License, or
|
|
// (at your option) any later version.
|
|
//
|
|
// This program is distributed in the hope that it will be useful,
|
|
// but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
// GNU Affero General Public License for more details.
|
|
//
|
|
// You should have received a copy of the GNU Affero General Public License
|
|
// along with this program. If not, see <http://www.gnu.org/licenses/>.
|
|
|
|
package middleware
|
|
|
|
import (
|
|
"codeberg.org/gruf/go-debug"
|
|
"github.com/gin-gonic/gin"
|
|
"github.com/superseriousbusiness/gotosocial/internal/config"
|
|
)
|
|
|
|
// ExtraHeaders returns a new gin middleware which adds various extra headers to the response.
|
|
func ExtraHeaders() gin.HandlerFunc {
|
|
csp := BuildContentSecurityPolicy()
|
|
|
|
return func(c *gin.Context) {
|
|
// Inform all callers which server implementation this is.
|
|
c.Header("Server", "gotosocial")
|
|
|
|
// Prevent google chrome cohort tracking. Originally this was referred
|
|
// to as FlocBlock. Floc was replaced by Topics in 2022 and the spec says
|
|
// that interest-cohort will also block Topics (as of 2022-Nov).
|
|
//
|
|
// See: https://smartframe.io/blog/google-topics-api-everything-you-need-to-know
|
|
//
|
|
// See: https://github.com/patcg-individual-drafts/topics
|
|
c.Header("Permissions-Policy", "browsing-topics=()")
|
|
|
|
// Inform the browser we only load
|
|
// CSS/JS/media using the given policy.
|
|
c.Header("Content-Security-Policy", csp)
|
|
}
|
|
}
|
|
|
|
func BuildContentSecurityPolicy() string {
|
|
// Start with restrictive policy.
|
|
policy := "default-src 'self'"
|
|
|
|
if debug.DEBUG {
|
|
// Debug is enabled, allow
|
|
// serving things from localhost
|
|
// as well (regardless of port).
|
|
policy += " localhost:*"
|
|
}
|
|
|
|
s3Endpoint := config.GetStorageS3Endpoint()
|
|
if s3Endpoint == "" {
|
|
// S3 not configured,
|
|
// default policy is OK.
|
|
return policy
|
|
}
|
|
|
|
if config.GetStorageS3Proxy() {
|
|
// S3 is configured in proxy
|
|
// mode, default policy is OK.
|
|
return policy
|
|
}
|
|
|
|
// S3 is on and in non-proxy mode, so we need to add the S3 host to
|
|
// the policy to allow images and video to be pulled from there too.
|
|
|
|
// If secure is false,
|
|
// use 'http' scheme.
|
|
scheme := "https"
|
|
if !config.GetStorageS3UseSSL() {
|
|
scheme = "http"
|
|
}
|
|
|
|
// Construct endpoint URL.
|
|
s3EndpointURLStr := scheme + "://" + s3Endpoint
|
|
|
|
// When object storage is in use in non-proxied mode, GtS still serves some
|
|
// assets itself like the logo, so keep 'self' in there. That should also
|
|
// handle any redirects from the fileserver to object storage.
|
|
|
|
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/img-src
|
|
policy += "; img-src 'self' " + s3EndpointURLStr
|
|
|
|
// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/media-src
|
|
policy += "; media-src 'self' " + s3EndpointURLStr
|
|
|
|
return policy
|
|
}
|