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-rw-r--r--plugins/mod_httpserver.lua26
1 files changed, 25 insertions, 1 deletions
diff --git a/plugins/mod_httpserver.lua b/plugins/mod_httpserver.lua
index a8639281..55ac3c7a 100644
--- a/plugins/mod_httpserver.lua
+++ b/plugins/mod_httpserver.lua
@@ -11,14 +11,19 @@ local httpserver = require "net.httpserver";
local open = io.open;
local t_concat = table.concat;
+local check_http_path;
local http_base = "www_files";
+local response_403 = { status = "403 Forbidden", body = "<h1>Invalid URL</h1>Sorry, we couldn't find what you were looking for :(" };
local response_404 = { status = "404 Not Found", body = "<h1>Page Not Found</h1>Sorry, we couldn't find what you were looking for :(" };
local http_path = { http_base };
local function handle_request(method, body, request)
- local path = request.url.path:gsub("%.%.%/", ""):gsub("^/[^/]+", "");
+ local path = check_http_path(request.url.path:gsub("^/[^/]+%.*", ""));
+ if not path then
+ return response_403;
+ end
http_path[2] = path;
local f, err = open(t_concat(http_path), "r");
if not f then return response_404; end
@@ -29,3 +34,22 @@ end
local ports = config.get(module.host, "core", "http_ports") or { 5280 };
httpserver.new_from_config(ports, "files", handle_request);
+
+function check_http_path(url)
+ if url:sub(1,1) ~= "/" then
+ url = "/"..url;
+ end
+
+ local level = 0;
+ for part in url:gmatch("%/([^/]+)") do
+ if part == ".." then
+ level = level - 1;
+ elseif part ~= "." then
+ level = level + 1;
+ end
+ if level < 0 then
+ return nil;
+ end
+ end
+ return url;
+end