Skip to content

Instantly share code, notes, and snippets.

@Appla
Forked from mariocesar/access.lua
Created Jul 19, 2017
Embed
What would you like to do?
Nginx Lua script redis based for Basic user authentication
function password_encode(password)
local bcrypt = require 'bcrypt'
return bcrypt.digest(password, 12)
end
function check_password(password, encoded_password)
local bcrypt = require 'bcrypt'
return bcrypt.verify(password, encoded_password)
end
function get_user(username)
--- Defaults
local access_redis_host = ngx.var.access_redis_host == ''
and '127.0.0.1' or ngx.var.access_redis_host
local access_redis_port = ngx.var.access_redis_port == ''
and 6379 or ngx.var.access_redis_port
local access_user_catalogue = ngx.var.access_user_catalogue == ''
and 'nginx_catalogue:users' or ngx.var.access_user_catalogue
---
local redis = require "nginx.redis"
local red = redis:new()
red:set_timeout(1000)
local ok, err = red:connect(access_redis_host, access_redis_port)
if not ok then
ngx.log(ngx.ERR, "failed to connect to the redis server: ", err)
ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR)
return
end
local res, err = red:hget(access_user_catalogue, username)
if not res then
ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR)
return
end
-- User is not found
if res == ngx.null then
return
end
return res
end
function authenticate()
-- Test Authentication header is set and with a value
local header = ngx.req.get_headers()['Authorization']
if header == nil or header:find(" ") == nil then
return false
end
local divider = header:find(' ')
if header:sub(0, divider-1) ~= 'Basic' then
return false
end
local auth = ngx.decode_base64(header:sub(divider+1))
if auth == nil or auth:find(':') == nil then
return false
end
divider = auth:find(':')
local username = auth:sub(0, divider-1)
local password = auth:sub(divider+1)
local res = get_user(username)
if res == nil then
return false
end
if check_password(password, res) then
return true
end
return false
end
local user = authenticate()
if not user then
ngx.header.content_type = 'text/plain'
ngx.header.www_authenticate = 'Basic realm=""'
ngx.status = ngx.HTTP_UNAUTHORIZED
ngx.say('401 Access Denied')
end
server {
listen 80;
server_name _;
root /var/www/html;
location / {
set $access_redis_host '127.0.0.1';
set $access_redis_port 6379;
set $access_user_catalogue 'myapp:users';
access_by_lua_file access.lua;
}
}
Sign up for free to join this conversation on GitHub. Already have an account? Sign in to comment