| -rw-r--r-- | filters/gentoo-ldap-authentication.lua | 320 |
1 files changed, 0 insertions, 320 deletions
diff --git a/filters/gentoo-ldap-authentication.lua b/filters/gentoo-ldap-authentication.lua deleted file mode 100644 index fce5632..0000000 --- a/filters/gentoo-ldap-authentication.lua +++ /dev/null @@ -1,320 +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/> --- lualdap >= 1.2 --- <http://git.zx2c4.com/lualdap/about/> --- - - --- --- --- Configure these variables for your settings. --- --- - --- A list of password protected repositories, with which gentooAccess --- group is allowed to access each one. -local protected_repos = { - glouglou = "infra", - portage = "dev" -} - - --- 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" - - - --- --- --- Authentication functions follow below. Swap these out if you want different authentication semantics. --- --- - --- Sets HTTP cookie headers based on post and sets up redirection. -function authenticate_post() - local redirect = validate_value("redirect", post["redirect"]) - - if redirect == nil then - not_found() - return 0 - end - - redirect_to(redirect) - - local groups = gentoo_ldap_user_groups(post["username"], post["password"]) - if groups == nil then - set_cookie("cgitauth", "") - else - -- One week expiration time - set_cookie("cgitauth", secure_value("gentoogroups", table.concat(groups, ","), os.time() + 604800)) - end - - html("\n") - return 0 -end - - --- Returns 1 if the cookie is valid and 0 if it is not. -function authenticate_cookie() - local required_group = protected_repos[cgit["repo"]] - if required_group == nil then - -- We return as valid if the repo is not protected. - return 1 - end - - local user_groups = validate_value("gentoogroups", get_cookie(http["cookie"], "cgitauth")) - if user_groups == nil or user_groups == "" then - return 0 - end - for group in string.gmatch(user_groups, "[^,]+") do - if group == required_group then - return 1 - end - end - return 0 -end - --- Prints the html for the login form. -function body() - html("<h2>Gentoo LDAP Authentication Required</h2>") - html("<form method='post' action='") - html_attr(cgit["login"]) - html("'>") - html("<input type='hidden' name='redirect' value='") - html_attr(secure_value("redirect", cgit["url"], 0)) - 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 - --- --- --- Gentoo LDAP support. --- --- - -local lualdap = require("lualdap") - -function gentoo_ldap_user_groups(username, password) - -- Ensure the user is alphanumeric - if username:match("%W") then - return nil - end - - local who = "uid=" .. username .. ",ou=devs,dc=gentoo,dc=org" - - local ldap, err = lualdap.open_simple { - uri = "ldap://ldap1.gentoo.org", - who = who, - password = password, - starttls = true, - certfile = "/var/www/uwsgi/cgit/gentoo-ldap/star.gentoo.org.crt", - keyfile = "/var/www/uwsgi/cgit/gentoo-ldap/star.gentoo.org.key", - cacertfile = "/var/www/uwsgi/cgit/gentoo-ldap/ca.pem" - } - if ldap == nil then - return nil - end - - local group_suffix = ".group" - local group_suffix_len = group_suffix:len() - local groups = {} - for dn, attribs in ldap:search { base = who, scope = "subtree" } do - local access = attribs["gentooAccess"] - if dn == who and access ~= nil then - for i, v in ipairs(access) do - local vlen = v:len() - if vlen > group_suffix_len and v:sub(-group_suffix_len) == group_suffix then - table.insert(groups, v:sub(1, vlen - group_suffix_len)) - end - end - end - end - - ldap:close() - - return groups -end - --- --- --- Wrapper around filter API, 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"] = select(12, ...) - -end - -function filter_close() - return action() -end - -function filter_write(str) - post = parse_qs(str) -end - - --- --- --- Utility functions 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 url_encode(str) - if not str then - 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, " ", "+") - 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 string.match(cookies, ";" .. name .. "=(.-);") -end - - --- --- --- Cookie construction and validation helpers. --- --- - -local crypto = require("crypto") - --- Returns value of cookie if cookie is valid. Otherwise returns nil. -function validate_value(expected_field, cookie) - local i = 0 - local value = "" - local field = "" - local expiration = 0 - local salt = "" - local hmac = "" - - if cookie == nil or cookie:len() < 3 or cookie:sub(1, 1) == "|" then - return nil - end - - for component in string.gmatch(cookie, "[^|]+") do - if i == 0 then - field = component - elseif i == 1 then - value = component - elseif i == 2 then - expiration = tonumber(component) - if expiration == nil then - expiration = -1 - end - elseif i == 3 then - salt = component - elseif i == 4 then - hmac = component - else - break - end - i = i + 1 - end - - if hmac == nil or hmac:len() == 0 then - return nil - end - - -- Lua hashes strings, so these comparisons are time invariant. - if hmac ~= crypto.hmac.digest("sha1", field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt, secret) then - return nil - end - - if expiration == -1 or (expiration ~= 0 and expiration <= os.time()) then - return nil - end - - if url_decode(field) ~= expected_field then - return nil - end - - return url_decode(value) -end - -function secure_value(field, value, expiration) - if value == nil or value:len() <= 0 then - return "" - end - - local authstr = "" - local salt = crypto.hex(crypto.rand.bytes(16)) - value = url_encode(value) - field = url_encode(field) - authstr = field .. "|" .. value .. "|" .. tostring(expiration) .. "|" .. salt - authstr = authstr .. "|" .. crypto.hmac.digest("sha1", authstr, secret) - return authstr -end - -function set_cookie(cookie, value) - html("Set-Cookie: " .. cookie .. "=" .. value .. "; HttpOnly") - if http["https"] == "yes" or http["https"] == "on" or http["https"] == "1" then - html("; secure") - end - html("\n") -end - -function redirect_to(url) - html("Status: 302 Redirect\n") - html("Cache-Control: no-cache, no-store\n") - html("Location: " .. url .. "\n") -end - -function not_found() - html("Status: 404 Not Found\n") - html("Cache-Control: no-cache, no-store\n\n") -end |