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Revamped and corrected LUA files addition, and revamped dockerfile to…
… reduce image size
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,119 @@ | ||
| -- The MIT License (MIT) | ||
| -- | ||
| -- Copyright (c) 2018 Tim Düsterhus | ||
| -- | ||
| -- Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| -- of this software and associated documentation files (the "Software"), to deal | ||
| -- in the Software without restriction, including without limitation the rights | ||
| -- to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| -- copies of the Software, and to permit persons to whom the Software is | ||
| -- furnished to do so, subject to the following conditions: | ||
| -- | ||
| -- The above copyright notice and this permission notice shall be included in all | ||
| -- copies or substantial portions of the Software. | ||
| -- | ||
| -- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| -- IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| -- FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| -- AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| -- LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| -- OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| -- SOFTWARE. | ||
|
|
||
| local http = require("haproxy-lua-http") | ||
|
|
||
| function set_var_pre_2_2(txn, var, value) | ||
| return txn:set_var(var, value) | ||
| end | ||
| function set_var_post_2_2(txn, var, value) | ||
| return txn:set_var(var, value, true) | ||
| end | ||
|
|
||
| set_var = function(txn, var, value) | ||
| local success = pcall(set_var_post_2_2, txn, var, value) | ||
| if success then | ||
| set_var = set_var_post_2_2 | ||
| else | ||
| set_var = set_var_pre_2_2 | ||
| end | ||
|
|
||
| return set_var(txn, var, value) | ||
| end | ||
|
|
||
| function sanitize_header_for_variable(header) | ||
| return header:gsub("[^a-zA-Z0-9]", "_") | ||
| end | ||
|
|
||
|
|
||
| core.register_action("auth-request", { "http-req" }, function(txn, be, path) | ||
| set_var(txn, "txn.auth_response_successful", false) | ||
|
|
||
| -- Check whether the given backend exists. | ||
| if core.backends[be] == nil then | ||
| txn:Alert("Unknown auth-request backend '" .. be .. "'") | ||
| set_var(txn, "txn.auth_response_code", 500) | ||
| return | ||
| end | ||
|
|
||
| -- Check whether the given backend has servers that | ||
| -- are not `DOWN`. | ||
| local addr = nil | ||
| for name, server in pairs(core.backends[be].servers) do | ||
| local status = server:get_stats()['status'] | ||
| if status == "no check" or status:find("UP") == 1 then | ||
| addr = server:get_addr() | ||
| break | ||
| end | ||
| end | ||
| if addr == nil then | ||
| txn:Warning("No servers available for auth-request backend: '" .. be .. "'") | ||
| set_var(txn, "txn.auth_response_code", 500) | ||
| return | ||
| end | ||
|
|
||
| -- Transform table of request headers from haproxy's to | ||
| -- socket.http's format. | ||
| local headers = {} | ||
| for header, values in pairs(txn.http:req_get_headers()) do | ||
| if header ~= 'content-length' then | ||
| for i, v in pairs(values) do | ||
| if headers[header] == nil then | ||
| headers[header] = v | ||
| else | ||
| headers[header] = headers[header] .. ", " .. v | ||
| end | ||
| end | ||
| end | ||
| end | ||
|
|
||
| -- Make request to backend. | ||
| local response, err = http.head { | ||
| url = "http://" .. addr .. path, | ||
| headers = headers, | ||
| } | ||
|
|
||
| -- Check whether we received a valid HTTP response. | ||
| if response == nil then | ||
| txn:Warning("Failure in auth-request backend '" .. be .. "': " .. err) | ||
| set_var(txn, "txn.auth_response_code", 500) | ||
| return | ||
| end | ||
|
|
||
| set_var(txn, "txn.auth_response_code", response.status_code) | ||
|
|
||
| for header, value in response:get_headers(true) do | ||
| set_var(txn, "req.auth_response_header." .. sanitize_header_for_variable(header), value) | ||
| end | ||
|
|
||
| -- 2xx: Allow request. | ||
| if 200 <= response.status_code and response.status_code < 300 then | ||
| set_var(txn, "txn.auth_response_successful", true) | ||
| -- Don't allow other codes. | ||
| -- Codes with Location: Passthrough location at redirect. | ||
| elseif response.status_code == 301 or response.status_code == 302 or response.status_code == 303 or response.status_code == 307 or response.status_code == 308 then | ||
| set_var(txn, "txn.auth_response_location", response:get_header("location", "last")) | ||
| -- 401 / 403: Do nothing, everything else: log. | ||
| elseif response.status_code ~= 401 and response.status_code ~= 403 then | ||
| txn:Warning("Invalid status code in auth-request backend '" .. be .. "': " .. response.status_code) | ||
| end | ||
| end, 2) |
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