auth: have cgit calculate login address

[ps-cgit] / filters / simple-authentication.lua

diff --git a/filters/simple-authentication.lua b/filters/simple-authentication.lua
index 5935d080f87e0388a2dfdcf9b8b1586f93c186d5..92913024d1c5d0cda8ae18dbb72fae8840279147 100644 (file)
--- a/filters/simple-authentication.lua
+++ b/filters/simple-authentication.lua
@@ -45,7 +45,7 @@ function authenticate_post()
 
        redirect_to(redirect)
 
-       -- TODO: Implement time invariant string comparison function to mitigate timing attack.
+       -- Lua hashes strings, so these comparisons are time invariant.
        if password == nil or password ~= post["password"] then
                set_cookie("cgitauth", "")
        else
@@ -122,12 +122,7 @@ function filter_open(...)
        cgit["repo"] = select(9, ...)
        cgit["page"] = select(10, ...)
        cgit["url"] = select(11, ...)
-
-       cgit["login"] = ""
-       for _ in cgit["url"]:gfind("/") do
-               cgit["login"] = cgit["login"] .. "../"
-       end
-       cgit["login"] = cgit["login"] .. "?p=login"
+       cgit["login"] = select(12, ...)
 
 end
 
@@ -222,7 +217,7 @@ function validate_value(cookie)
                return nil
        end
 
-       -- TODO: implement time invariant comparison to prevent against timing attack.
+       -- Lua hashes strings, so these comparisons are time invariant.
        if hmac ~= crypto.hmac.digest("sha1", value .. "|" .. tostring(expiration) .. "|" .. salt, secret) then
                return nil
        end