Diffstat (limited to 'filters/simple-authentication.lua')
| -rw-r--r-- | filters/simple-authentication.lua | 225 |
1 files changed, 0 insertions, 225 deletions
diff --git a/filters/simple-authentication.lua b/filters/simple-authentication.lua deleted file mode 100644 index 4cd4983..0000000 --- a/filters/simple-authentication.lua +++ /dev/null @@ -1,225 +0,0 @@ --- This script may be used with the auth-filter. Be sure to configure it as you wish. --- --- Requirements: --- luacrypto >= 0.3 --- <http://mkottman.github.io/luacrypto/> --- - - --- --- --- Configure these variables for your settings. --- --- - -local protected_repos = { - glouglou = { laurent = true, jason = true }, - qt = { jason = true, bob = true } -} - -local users = { - jason = "secretpassword", - laurent = "s3cr3t", - bob = "ilikelua" -} - -local secret = "BE SURE TO CUSTOMIZE THIS STRING TO SOMETHING BIG AND RANDOM" - - - --- --- --- Authentication functions follow below. Swap these out if you want different authentication semantics. --- --- - --- Sets HTTP cookie headers based on post -function authenticate_post() - local password = users[post["username"]] - -- TODO: Implement time invariant string comparison function to mitigate against timing attack. - if password == nil or password ~= post["password"] then - construct_cookie("", "cgitauth") - else - construct_cookie(post["username"], "cgitauth") - end - return 0 -end - - --- Returns 1 if the cookie is valid and 0 if it is not. -function authenticate_cookie() - accepted_users = protected_repos[cgit["repo"]] - if accepted_users == nil then - -- We return as valid if the repo is not protected. - return 1 - end - - local username = validate_cookie(get_cookie(http["cookie"], "cgitauth")) - if username == nil or not accepted_users[username] then - return 0 - else - return 1 - end -end - --- Prints the html for the login form. -function body() - html("<h2>Authentication Required</h2>") - html("<form method='post' action='") - html_attr(cgit["login"]) - html("'>") - html("<table>") - html("<tr><td><label for='username'>Username:</label></td><td><input id='username' name='username' autofocus /></td></tr>") - html("<tr><td><label for='password'>Password:</label></td><td><input id='password' name='password' type='password' /></td></tr>") - html("<tr><td colspan='2'><input value='Login' type='submit' /></td></tr>") - html("</table></form>") - - return 0 -end - - --- --- --- Cookie construction and validation helpers. --- --- - -local crypto = require("crypto") - --- Returns username of cookie if cookie is valid. Otherwise returns nil. -function validate_cookie(cookie) - local i = 0 - local username = "" - local expiration = 0 - local salt = "" - local hmac = "" - - if cookie:len() < 3 or cookie:sub(1, 1) == "|" then - return nil - end - - for component in string.gmatch(cookie, "[^|]+") do - if i == 0 then - username = component - elseif i == 1 then - expiration = tonumber(component) - if expiration == nil then - expiration = 0 - end - elseif i == 2 then - salt = component - elseif i == 3 then - hmac = component - else - break - end - i = i + 1 - end - - if hmac == nil or hmac:len() == 0 then - return nil - end - - -- TODO: implement time invariant comparison to prevent against timing attack. - if hmac ~= crypto.hmac.digest("sha1", username .. "|" .. tostring(expiration) .. "|" .. salt, secret) then - return nil - end - - if expiration <= os.time() then - return nil - end - - return username:lower() -end - -function construct_cookie(username, cookie) - local authstr = "" - if username:len() > 0 then - -- One week expiration time - local expiration = os.time() + 604800 - local salt = crypto.hex(crypto.rand.bytes(16)) - - authstr = username .. "|" .. tostring(expiration) .. "|" .. salt - authstr = authstr .. "|" .. crypto.hmac.digest("sha1", authstr, secret) - end - - html("Set-Cookie: " .. cookie .. "=" .. authstr .. "; HttpOnly") - if http["https"] == "yes" or http["https"] == "on" or http["https"] == "1" then - html("; secure") - end - html("\n") -end - --- --- --- Wrapper around filter API follows below, exposing the http table, the cgit table, and the post table to the above functions. --- --- - -local actions = {} -actions["authenticate-post"] = authenticate_post -actions["authenticate-cookie"] = authenticate_cookie -actions["body"] = body - -function filter_open(...) - action = actions[select(1, ...)] - - http = {} - http["cookie"] = select(2, ...) - http["method"] = select(3, ...) - http["query"] = select(4, ...) - http["referer"] = select(5, ...) - http["path"] = select(6, ...) - http["host"] = select(7, ...) - http["https"] = select(8, ...) - - cgit = {} - 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" - -end - -function filter_close() - return action() -end - -function filter_write(str) - post = parse_qs(str) -end - - --- --- --- Utility functions follow below, based on keplerproject/wsapi. --- --- - -function url_decode(str) - if not str then - return "" - end - str = string.gsub(str, "+", " ") - str = string.gsub(str, "%%(%x%x)", function(h) return string.char(tonumber(h, 16)) end) - str = string.gsub(str, "\r\n", "\n") - return str -end - -function parse_qs(qs) - local tab = {} - for key, val in string.gmatch(qs, "([^&=]+)=([^&=]*)&?") do - tab[url_decode(key)] = url_decode(val) - end - return tab -end - -function get_cookie(cookies, name) - cookies = string.gsub(";" .. cookies .. ";", "%s*;%s*", ";") - return url_decode(string.match(cookies, ";" .. name .. "=(.-);")) -end |