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[feature] Set some security related headers (#3065)

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* Set frame-ancestors in the CSP
   This ensures we can't be loaded/embedded in an iframe. It also sets the
   older X-Frame-Options for fallback.
* Disable MIME type sniffing
* Set Referrer-Policy
   This sets the policy such that browsers will never send the Referer
   header along with a request, unless it's a request to the same protocol,
   host/domain and port. Basically, only send it when navigating through
   our own UI, but not anything external.

   The default is strict-origin-when-cross-origin when unset, which sends
   the Referer header for requests unless it's going from HTTPS to HTTP
   (i.e a security downgrade, hence the 'strict').
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Daenney 2024-07-04 10:07:02 +02:00 committed by GitHub
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commit 02d6e2e3bc
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9
internal/middleware/contentsecuritypolicy.go
View file

@ -40,6 +40,7 @@ func BuildContentSecurityPolicy(extraURIs ...string) string {
objectSrc = "object-src"
imgSrc = "img-src"
mediaSrc = "media-src"
frames = "frame-ancestors"
self = "'self'"
none = "'none'"
@ -102,6 +103,14 @@ func BuildContentSecurityPolicy(extraURIs ...string) string {
extraURIs...,
)
/*
frame-ancestors
https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/frame-ancestors
*/
// Don't allow embedding us in an iframe
values[frames] = []string{none}
/*
Assemble policy directives.
*/

9
internal/middleware/extraheaders.go
View file

@ -27,6 +27,15 @@ func ExtraHeaders() gin.HandlerFunc {
// Inform all callers which server implementation this is.
c.Header("Server", "gotosocial")
// Equivalent to CSP frame-ancestors for older browsers
c.Header("X-Frame-Options", "DENY")
// Don't do MIME type sniffing
c.Header("X-Content-Type-Options", "nosniff")
// Only send Referer header for URLs matching our protocol, hostname and port
c.Header("Referrer-Policy", "same-origin")
// 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).