mirror of
https://github.com/superseriousbusiness/gotosocial.git
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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'
98 lines
3.1 KiB
Go
98 lines
3.1 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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"codeberg.org/gruf/go-debug"
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"github.com/gin-gonic/gin"
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"github.com/superseriousbusiness/gotosocial/internal/config"
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)
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// ExtraHeaders returns a new gin middleware which adds various extra headers to the response.
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func ExtraHeaders() gin.HandlerFunc {
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csp := BuildContentSecurityPolicy()
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return func(c *gin.Context) {
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// Inform all callers which server implementation this is.
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c.Header("Server", "gotosocial")
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// Prevent google chrome cohort tracking. Originally this was referred
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// to as FlocBlock. Floc was replaced by Topics in 2022 and the spec says
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// that interest-cohort will also block Topics (as of 2022-Nov).
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//
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// See: https://smartframe.io/blog/google-topics-api-everything-you-need-to-know
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//
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// See: https://github.com/patcg-individual-drafts/topics
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c.Header("Permissions-Policy", "browsing-topics=()")
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// Inform the browser we only load
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// CSS/JS/media using the given policy.
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c.Header("Content-Security-Policy", csp)
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}
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}
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func BuildContentSecurityPolicy() string {
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// Start with restrictive policy.
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policy := "default-src 'self'"
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if debug.DEBUG {
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// Debug is enabled, allow
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// serving things from localhost
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// as well (regardless of port).
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policy += " localhost:*"
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}
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s3Endpoint := config.GetStorageS3Endpoint()
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if s3Endpoint == "" {
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// S3 not configured,
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// default policy is OK.
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return policy
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}
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if config.GetStorageS3Proxy() {
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// S3 is configured in proxy
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// mode, default policy is OK.
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return policy
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}
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// S3 is on and in non-proxy mode, so we need to add the S3 host to
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// the policy to allow images and video to be pulled from there too.
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// If secure is false,
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// use 'http' scheme.
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scheme := "https"
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if !config.GetStorageS3UseSSL() {
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scheme = "http"
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}
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// Construct endpoint URL.
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s3EndpointURLStr := scheme + "://" + s3Endpoint
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// When object storage is in use in non-proxied mode, GtS still serves some
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// assets itself like the logo, so keep 'self' in there. That should also
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// handle any redirects from the fileserver to object storage.
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// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/img-src
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policy += "; img-src 'self' " + s3EndpointURLStr
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// https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/media-src
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policy += "; media-src 'self' " + s3EndpointURLStr
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return policy
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}
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