X-Git-Url: https://gitweb.ps.run/ps-cgit/blobdiff_plain/b826537cb4aa2358027ffcb1dd6a87274734e962..911d574250d3a2ae97f282fb8f466db2afa1cd64:/filters/simple-authentication.lua

diff --git a/filters/simple-authentication.lua b/filters/simple-authentication.lua
index 5935d08..cc86b7e 100644
--- a/filters/simple-authentication.lua
+++ b/filters/simple-authentication.lua
@@ -12,17 +12,27 @@
 --
 --
 
+-- A list of password protected repositories along with the users who can access them.
 local protected_repos = {
 	glouglou	= { laurent = true, jason = true },
 	qt		= { jason = true, bob = true }
 }
 
+-- Please note that, in production, you'll want to replace this simple lookup
+-- table with either a table of salted and hashed passwords (using something
+-- smart like scrypt), or replace this table lookup with an external support,
+-- such as consulting your system's pam / shadow system, or an external
+-- database, or an external validating web service. For testing, or for
+-- extremely low-security usage, you may be able, however, to get away with
+-- compromising on hardcoding the passwords in cleartext, as we have done here.
 local users = {
 	jason		= "secretpassword",
 	laurent		= "s3cr3t",
 	bob		= "ilikelua"
 }
 
+-- All cookies will be authenticated based on this secret. Make it something
+-- totally random and impossible to guess. It should be large.
 local secret = "BE SURE TO CUSTOMIZE THIS STRING TO SOMETHING BIG AND RANDOM"
 
 
@@ -45,7 +55,7 @@ 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 +132,7 @@ 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
 
@@ -161,7 +166,7 @@ function url_encode(str)
 		return ""
 	end
 	str = string.gsub(str, "\n", "\r\n")
-	str = string.gsub(str, "([^%w ])", function (c) return string.format("%%%02X", string.byte(c)) end)
+	str = string.gsub(str, "([^%w ])", function(c) return string.format("%%%02X", string.byte(c)) end)
 	str = string.gsub(str, " ", "+")
 	return str
 end
@@ -222,7 +227,7 @@ 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