/**
* Check if CSP Header setting is already inherited from one.app (top level context) See
* https://www.w3.org/TR/CSP2/#which-policy-applies
*
* @param defDesc
* @param req
* @return true if CSP header setting can be skipped
*/
private boolean canSkipCSPHeader(final DefDescriptor<?> defDesc, final HttpServletRequest req) {
if (defDesc == null | req == null) {
return false;
}
// CSP inheritance is supported starting from CSP2
if (!isCSP2Supported(req)) {
return false;
}
final String descriptorName = defDesc.getDescriptorName();
if (!descriptorName.equals("one:one")) { // only skip while loading one.app
return false;
}
final String auraFormat = req.getParameter("aura.format");
if (auraFormat != null && auraFormat.equals("HTML")) {
return false;
}
// Skip one.app requests for non HTML content with already established aura context
final String auraContext = req.getParameter("aura.context");
if (auraContext != null) {
return true;
}
return false;
}
/** Sets mandatory headers, notably for anti-clickjacking. */
@Override
public void setCSPHeaders(DefDescriptor<?> top, HttpServletRequest req, HttpServletResponse rsp) {
if (canSkipCSPHeader(top, req)) {
return;
}
ContentSecurityPolicy csp =
configAdapter.getContentSecurityPolicy(top == null ? null : top.getQualifiedName(), req);
if (csp != null) {
rsp.setHeader(CSP.Header.SECURE, csp.getCspHeaderValue());
Collection<String> terms = csp.getFrameAncestors();
if (terms != null) {
// not open to the world; figure whether we can express an X-FRAME-OPTIONS header:
if (terms.size() == 0) {
// closed to any framing at all
rsp.setHeader(HDR_FRAME_OPTIONS, HDR_FRAME_DENY);
} else if (terms.size() == 1) {
// With one ancestor term, we're either SAMEORIGIN or ALLOWFROM
for (String site : terms) {
if (site == null) {
// Add same-origin headers and policy terms
rsp.addHeader(HDR_FRAME_OPTIONS, HDR_FRAME_SAMEORIGIN);
} else if (!site.contains("*") && !site.matches("^[a-z]+:$")) {
// XFO can't express wildcards or protocol-only, so set only for a specific site:
rsp.addHeader(HDR_FRAME_OPTIONS, HDR_FRAME_ALLOWFROM + site);
} else {
// When XFO can't express it, still set an ALLOWALL so filters don't jump in
rsp.addHeader(HDR_FRAME_OPTIONS, HDR_FRAME_ALLOWALL);
}
}
}
}
}
}
