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-rw-r--r--background/policy_injector.js33
1 files changed, 17 insertions, 16 deletions
diff --git a/background/policy_injector.js b/background/policy_injector.js
index 1d4db6f..72318d4 100644
--- a/background/policy_injector.js
+++ b/background/policy_injector.js
@@ -16,25 +16,27 @@
* IMPORTS_END
*/
-function inject_csp_headers(details, headers, policy)
+function inject_csp_headers(headers, policy)
{
- const url = details.url;
-
- let orig_csp_headers;
+ let csp_headers;
let old_signature;
let hachette_header;
for (const header of headers.filter(h => h.name === "x-hachette")) {
- const match = /^([^%])(%.*)$/.exec(header.value);
+ /* x-hachette header has format: <signature>_0_<data> */
+ const match = /^([^_]+)_(0_.*)$/.exec(header.value);
if (!match)
continue;
- const old_data = extract_signed(...match.splice(1, 2), [[0]]);
- if (!old_data || old_data.url !== url)
+ const result = extract_signed(...match.slice(1, 3));
+ if (result.fail)
continue;
+ /* This should succeed - it's our self-produced valid JSON. */
+ const old_data = JSON.parse(decodeURIComponent(result.data));
+
/* Confirmed- it's the originals, smuggled in! */
- orig_csp_headers = old_data.csp_headers;
+ csp_headers = old_data.csp_headers;
old_signature = old_data.policy_sig;
hachette_header = header;
@@ -46,24 +48,23 @@ function inject_csp_headers(details, headers, policy)
headers.push(hachette_header);
}
- orig_csp_headers = orig_csp_headers ||
+ csp_headers = csp_headers ||
headers.filter(h => is_csp_header_name(h.name));
/* When blocking remove report-only CSP headers that snitch on us. */
headers = headers.filter(h => !is_csp_header_name(h.name, !policy.allow));
if (old_signature)
- headers = headers.filter(h => h.name.search(old_signature) === -1);
+ headers = headers.filter(h => h.value.search(old_signature) === -1);
- const sanitizer = h => sanitize_csp_header(h, policy);
- headers.push(...orig_csp_headers.map(sanitizer));
+ headers.push(...csp_headers.map(h => sanitize_csp_header(h, policy)));
const policy_str = encodeURIComponent(JSON.stringify(policy));
- const policy_sig = sign_data(policy_str, new Date());
+ const signed_policy = sign_data(policy_str, new Date().getTime());
const later_30sec = new Date(new Date().getTime() + 30000).toGMTString();
headers.push({
name: "Set-Cookie",
- value: `hachette-${policy_sig}=${policy_str}; Expires=${later_30sec};`
+ value: `hachette-${signed_policy.join("=")}; Expires=${later_30sec};`
});
/*
@@ -71,9 +72,9 @@ function inject_csp_headers(details, headers, policy)
* These are signed with a time of 0, as it's not clear there is a limit on
* how long Firefox might retain headers in the cache.
*/
- let hachette_data = {csp_headers: orig_csp_headers, policy_sig, url};
+ let hachette_data = {csp_headers, policy_sig: signed_policy[0]};
hachette_data = encodeURIComponent(JSON.stringify(hachette_data));
- hachette_header.value = sign_data(hachette_data, 0) + hachette_data;
+ hachette_header.value = sign_data(hachette_data, 0).join("_");
/* To ensure there is a CSP header if required */
if (!policy.allow)