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fix CSP referrer policy 

The policy of "referrer none" was incorrect and was nonfunctional. With
this change, the CSP referrer policy is set to origin, which
will causes only the origin to be sent for requests made from the main
site.

A fix was also needed for referrer checks in two places.
This commit is contained in:
mutantmonkey 2015-10-11 23:31:57 -07:00
parent 4fee922543
commit cd83f9f0eb
3 changed files with 8 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
csrf.go
View File

@ -12,11 +12,13 @@ func strictReferrerCheck(r *http.Request, prefix string, whitelistHeaders []stri
}
}
if referrer := r.Header.Get("Referer"); !strings.HasPrefix(referrer, prefix) {
p := strings.TrimSuffix(prefix, "/")
if referrer := r.Header.Get("Referer"); !strings.HasPrefix(referrer, p) {
return false
}
if origin := r.Header.Get("Origin"); origin != "" && !strings.HasPrefix(origin, strings.TrimSuffix(prefix, "/")) {
if origin := r.Header.Get("Origin"); origin != "" && !strings.HasPrefix(origin, p) {
return false
}

3
fileserve.go
View File

@ -26,7 +26,8 @@ func fileServeHandler(c web.C, w http.ResponseWriter, r *http.Request) {
if !Config.allowHotlink {
referer := r.Header.Get("Referer")
if referer != "" && !strings.HasPrefix(referer, Config.siteURL) {
prefix := strings.TrimSuffix(Config.siteURL, "/")
if referer != "" && !strings.HasPrefix(referer, prefix) {
w.WriteHeader(403)
return
}

4
server.go
View File

@ -184,10 +184,10 @@ func main() {
flag.StringVar(&Config.remoteAuthFile, "remoteauthfile", "",
"path to a file containing newline-separated scrypted auth keys for remote uploads")
flag.StringVar(&Config.contentSecurityPolicy, "contentsecuritypolicy",
"default-src 'self'; img-src 'self' data:; style-src 'self' 'unsafe-inline'; referrer none;",
"default-src 'self'; img-src 'self' data:; style-src 'self' 'unsafe-inline'; referrer origin;",
"value of default Content-Security-Policy header")
flag.StringVar(&Config.fileContentSecurityPolicy, "filecontentsecuritypolicy",
"default-src 'none'; img-src 'self'; object-src 'self'; media-src 'self'; sandbox; referrer none;",
"default-src 'none'; img-src 'self'; object-src 'self'; media-src 'self'; sandbox; referrer origin;",
"value of Content-Security-Policy header for file access")
flag.StringVar(&Config.xFrameOptions, "xframeoptions", "SAMEORIGIN",
"value of X-Frame-Options header")