├── .gitignore ├── LICENSE ├── README.md ├── external-oauth-1.1-5.rockspec └── src ├── access.lua ├── handler.lua └── schema.lua /.gitignore: -------------------------------------------------------------------------------- 1 | # Compiled Lua sources 2 | luac.out 3 | 4 | # luarocks build files 5 | *.src.rock 6 | *.zip 7 | *.tar.gz 8 | 9 | # Object files 10 | *.o 11 | *.os 12 | *.ko 13 | *.obj 14 | *.elf 15 | 16 | # Precompiled Headers 17 | *.gch 18 | *.pch 19 | 20 | # Libraries 21 | *.lib 22 | *.a 23 | *.la 24 | *.lo 25 | *.def 26 | *.exp 27 | 28 | # Shared objects (inc. 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We also recommend that a 185 | file or class name and description of purpose be included on the 186 | same "printed page" as the copyright notice for easier 187 | identification within third-party archives. 188 | 189 | Copyright {yyyy} {name of copyright owner} 190 | 191 | Licensed under the Apache License, Version 2.0 (the "License"); 192 | you may not use this file except in compliance with the License. 193 | You may obtain a copy of the License at 194 | 195 | http://www.apache.org/licenses/LICENSE-2.0 196 | 197 | Unless required by applicable law or agreed to in writing, software 198 | distributed under the License is distributed on an "AS IS" BASIS, 199 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 200 | See the License for the specific language governing permissions and 201 | limitations under the License. 202 | -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # Kong External OAUTH 2.0 2 | 3 | A Kong plugin, that let you use an external Oauth 2.0 provider to protect your API. 4 | 5 | ## Description 6 | 7 | KONG has bundled a plugin to implement a full OAUTH 2.0 provider. This plugin instead let you use a 8 | third party OAUTH 2.0 provider to protect your API/site implementing the full flow, it will automatically 9 | expose a callback uri, and request an access token. 10 | 11 | It will then request user info (specified in the configuration) and add some header to let be used 12 | by your `upstream` service. 13 | 14 | The plugin will periodically check for token validity. You can configure the time period through 15 | a configuration parameter, in seconds. 16 | 17 | If configured, it can also check the provided email address and make sure it belongs to a particular 18 | domain, so you can use the plugin also for thirty party services. 19 | 20 | ## Installation 21 | 22 | $ luarocks install external-oauth 23 | 24 | To make Kong aware that it has to look for the new plugin, you'll have to add it to the custom_plugins 25 | property in your configuration file. 26 | 27 | ```yaml 28 | custom_plugins: 29 | - external-oauth 30 | ``` 31 | 32 | Remember to restart Kong. 33 | 34 | 35 | 36 | ## Configuration 37 | 38 | You can add the plugin with the following request: 39 | 40 | ```bash 41 | $ curl -X POST http://kong:8001/apis/{api}/plugins \ 42 | --data "name=external-oauth" \ 43 | --data "config.authorize_url=https://oauth.something.net/openid-connect/authorize" \ 44 | --data "config.scope=openid+profile+email" \ 45 | --data "config.token_url=https://oauth.something.net/openid-connect/token" \ 46 | --data "config.client_id=SOME_CLEINT_ID" \ 47 | --data "config.client_secret=SOME_SECRET_KEY" \ 48 | --data "config.user_url=https://oauth.something.net/openid-connect/userinfo" \ 49 | --data "config.user_keys=email,name,sub" 50 | --data "config.hosted_domain=mycompany.com" 51 | --data "config.email_key=email" 52 | ``` 53 | 54 | | Form Parameter | default | description | 55 | | --- | --- | --- | 56 | | `name` | | plugin name `external-oauth` | 57 | | `config.authorize_url` | | authorization url of the OAUTH provider (the one to which you will be redirected when not authenticated) | 58 | | `config.scope` | | OAUTH scope of the authorization request | 59 | | `config.token_url` | | url of the Oauth provider to request the access token | 60 | | `config.client_id` | | OAUTH Client Id | 61 | | `config.client_secret` | | OAUTH Client Secret | 62 | | `config.user_url` | | url of the oauth provider used to retrieve user information and also check the validity of the access token | 63 | | `config.user_keys`
Optional | `username,email` | keys to extract from the `user_url` endpoint returned json, they will also be added to the headers of the upstream server as `X-OAUTH-XXX` | 64 | | `config.hosted_domain` | | domain whose users must belong to in order to get logged in. Ignored if empty | 65 | | `config.email_key` | | key to be checked for hosted domain, taken from userinfo endpoint | 66 | | `config.user_info_periodic_check` | 60 | time in seconds between token checks | 67 | 68 | In addition to the `user_keys` will be added a `X-OAUTH-TOKEN` header with the access token of the provider. 69 | 70 | ## Author 71 | Niko Usai 72 | 73 | ## License 74 | 75 | Copyright 2016 Niko Usai 76 | 77 | Licensed under the Apache License, Version 2.0 (the "License"); 78 | you may not use this file except in compliance with the License. 79 | You may obtain a copy of the License at 80 | 81 | http://www.apache.org/licenses/LICENSE-2.0 82 | 83 | Unless required by applicable law or agreed to in writing, software 84 | distributed under the License is distributed on an "AS IS" BASIS, 85 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 86 | See the License for the specific language governing permissions and 87 | limitations under the License. 88 | -------------------------------------------------------------------------------- /external-oauth-1.1-5.rockspec: -------------------------------------------------------------------------------- 1 | package = "external-oauth" 2 | version = "1.1-5" 3 | source = { 4 | url = "git://github.com/mogui/kong-external-oauth" 5 | } 6 | description = { 7 | summary = "A Kong plugin, that let you use an external Oauth 2.0 provider to protect your API", 8 | license = "Apache 2.0" 9 | } 10 | dependencies = { 11 | "lua >= 5.1" 12 | -- If you depend on other rocks, add them here 13 | } 14 | build = { 15 | type = "builtin", 16 | modules = { 17 | ["kong.plugins.external-oauth.access"] = "src/access.lua", 18 | ["kong.plugins.external-oauth.handler"] = "src/handler.lua", 19 | ["kong.plugins.external-oauth.schema"] = "src/schema.lua" 20 | } 21 | } 22 | -------------------------------------------------------------------------------- /src/access.lua: -------------------------------------------------------------------------------- 1 | 2 | -- Copyright 2016 Niko Usai 3 | 4 | -- Licensed under the Apache License, Version 2.0 (the "License"); 5 | -- you may not use this file except in compliance with the License. 6 | -- You may obtain a copy of the License at 7 | 8 | -- http://www.apache.org/licenses/LICENSE-2.0 9 | 10 | -- Unless required by applicable law or agreed to in writing, software 11 | -- distributed under the License is distributed on an "AS IS" BASIS, 12 | -- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | -- See the License for the specific language governing permissions and 14 | -- limitations under the License. 15 | 16 | local _M = {} 17 | local cjson = require "cjson.safe" 18 | local pl_stringx = require "pl.stringx" 19 | local http = require "resty.http" 20 | local crypto = require "crypto" 21 | 22 | local OAUTH_CALLBACK = "^%s/oauth2/callback(/?(\\?[^\\s]*)*)$" 23 | 24 | function _M.run(conf) 25 | -- Check if the API has a request_path and if it's being invoked with the path resolver 26 | local path_prefix = "" 27 | 28 | if ngx.ctx.api.uris ~= nil then 29 | for index, value in ipairs(ngx.ctx.api.uris) do 30 | if pl_stringx.startswith(ngx.var.request_uri, value) then 31 | path_prefix = value 32 | break 33 | end 34 | end 35 | 36 | if pl_stringx.endswith(path_prefix, "/") then 37 | path_prefix = path_prefix:sub(1, path_prefix:len() - 1) 38 | end 39 | 40 | end 41 | 42 | local callback_url = ngx.var.scheme .. "://" .. ngx.var.host .. ":" .. ngx.var.server_port .. path_prefix .. "/oauth2/callback" 43 | 44 | -- check if we're calling the callback endpoint 45 | if ngx.re.match(ngx.var.request_uri, string.format(OAUTH_CALLBACK, path_prefix)) then 46 | handle_callback(conf, callback_url) 47 | else 48 | local encrypted_token = ngx.var.cookie_EOAuthToken 49 | -- check if we are authenticated already 50 | if encrypted_token then 51 | ngx.header["Set-Cookie"] = "EOAuthToken=" .. encrypted_token .. "; path=/;Max-Age=3000;HttpOnly" 52 | 53 | local access_token = decode_token(encrypted_token, conf) 54 | if not access_token then 55 | -- broken access token 56 | return redirect_to_auth( conf, callback_url ) 57 | end 58 | 59 | -- Get user info 60 | if not ngx.var.cookie_EOAuthUserInfo then 61 | local httpc = http:new() 62 | local res, err = httpc:request_uri(conf.user_url, { 63 | method = "GET", 64 | ssl_verify = false, 65 | headers = { 66 | ["Authorization"] = "Bearer " .. access_token, 67 | } 68 | }) 69 | 70 | if res then 71 | -- redirect to auth if user result is invalid not 200 72 | if res.status ~= 200 then 73 | return redirect_to_auth( conf, callback_url ) 74 | end 75 | 76 | local json = cjson.decode(res.body) 77 | 78 | if conf.hosted_domain ~= "" and conf.email_key ~= "" then 79 | if not pl_stringx.endswith(json[conf.email_key], conf.hosted_domain) then 80 | ngx.say("Hosted domain is not matching") 81 | ngx.exit(ngx.HTTP_UNAUTHORIZED) 82 | return 83 | end 84 | end 85 | 86 | for i, key in ipairs(conf.user_keys) do 87 | ngx.header["X-Oauth-".. key] = json[key] 88 | ngx.req.set_header("X-Oauth-".. key, json[key]) 89 | end 90 | ngx.header["X-Oauth-Token"] = access_token 91 | 92 | if type(ngx.header["Set-Cookie"]) == "table" then 93 | ngx.header["Set-Cookie"] = { "EOAuthUserInfo=0; Path=/;Max-Age=" .. conf.user_info_periodic_check .. ";HttpOnly", unpack(ngx.header["Set-Cookie"]) } 94 | else 95 | ngx.header["Set-Cookie"] = { "EOAuthUserInfo=0; Path=/;Max-Age=" .. conf.user_info_periodic_check .. ";HttpOnly", ngx.header["Set-Cookie"] } 96 | end 97 | 98 | else 99 | ngx.say(err) 100 | ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR) 101 | return 102 | end 103 | end 104 | 105 | 106 | else 107 | return redirect_to_auth( conf, callback_url ) 108 | end 109 | end 110 | 111 | end 112 | 113 | function redirect_to_auth( conf, callback_url ) 114 | -- Track the endpoint they wanted access to so we can transparently redirect them back 115 | ngx.header["Set-Cookie"] = "EOAuthRedirectBack=" .. ngx.var.request_uri .. "; path=/;Max-Age=120" 116 | -- Redirect to the /oauth endpoint 117 | local oauth_authorize = conf.authorize_url .. "?response_type=code&client_id=" .. conf.client_id .. "&redirect_uri=" .. callback_url .. "&scope=" .. conf.scope 118 | return ngx.redirect(oauth_authorize) 119 | end 120 | 121 | function encode_token(token, conf) 122 | return ngx.encode_base64(crypto.encrypt("aes-128-cbc", token, crypto.digest('md5',conf.client_secret))) 123 | end 124 | 125 | function decode_token(token, conf) 126 | status, token = pcall(function () return crypto.decrypt("aes-128-cbc", ngx.decode_base64(token), crypto.digest('md5',conf.client_secret)) end) 127 | if status then 128 | return token 129 | else 130 | return nil 131 | end 132 | end 133 | 134 | -- Callback Handling 135 | function handle_callback( conf, callback_url ) 136 | local args = ngx.req.get_uri_args() 137 | 138 | if args.code then 139 | local httpc = http:new() 140 | local res, err = httpc:request_uri(conf.token_url, { 141 | method = "POST", 142 | ssl_verify = false, 143 | body = "grant_type=authorization_code&client_id=" .. conf.client_id .. "&client_secret=" .. conf.client_secret .. "&code=" .. args.code .. "&redirect_uri=" .. callback_url, 144 | headers = { 145 | ["Content-Type"] = "application/x-www-form-urlencoded", 146 | } 147 | }) 148 | 149 | if not res then 150 | ngx.say("failed to request: ", err) 151 | ngx.exit(ngx.HTTP_INTERNAL_SERVER_ERROR) 152 | end 153 | 154 | local json = cjson.decode(res.body) 155 | local access_token = json.access_token 156 | if not access_token then 157 | ngx.say(json.error_description) 158 | ngx.exit(ngx.HTTP_BAD_REQUEST) 159 | end 160 | 161 | 162 | ngx.header["Set-Cookie"] = "EOAuthToken="..encode_token( access_token, conf ) .. "; path=/;Max-Age=3000;HttpOnly" 163 | -- Support redirection back to your request if necessary 164 | local redirect_back = ngx.var.cookie_EOAuthRedirectBack 165 | if redirect_back then 166 | return ngx.redirect(redirect_back) 167 | else 168 | return ngx.redirect(ngx.ctx.api.request_path) 169 | end 170 | else 171 | ngx.say("User has denied access to the resources.") 172 | ngx.exit(ngx.HTTP_UNAUTHORIZED) 173 | end 174 | end 175 | 176 | return _M 177 | -------------------------------------------------------------------------------- /src/handler.lua: -------------------------------------------------------------------------------- 1 | 2 | -- Copyright 2016 Niko Usai 3 | 4 | -- Licensed under the Apache License, Version 2.0 (the "License"); 5 | -- you may not use this file except in compliance with the License. 6 | -- You may obtain a copy of the License at 7 | 8 | -- http://www.apache.org/licenses/LICENSE-2.0 9 | 10 | -- Unless required by applicable law or agreed to in writing, software 11 | -- distributed under the License is distributed on an "AS IS" BASIS, 12 | -- WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 | -- See the License for the specific language governing permissions and 14 | -- limitations under the License. 15 | 16 | local BasePlugin = require "kong.plugins.base_plugin" 17 | local access = require "kong.plugins.external-oauth.access" 18 | 19 | local ExtOauthPlugin = BasePlugin:extend() 20 | 21 | function ExtOauthPlugin:new() 22 | ExtOauthPlugin.super.new(self, "external-oauth") 23 | end 24 | 25 | function ExtOauthPlugin:access(conf) 26 | ExtOauthPlugin.super.access(self) 27 | access.run(conf) 28 | end 29 | 30 | return ExtOauthPlugin 31 | -------------------------------------------------------------------------------- /src/schema.lua: -------------------------------------------------------------------------------- 1 | local url = require "socket.url" 2 | 3 | local function validate_url(value) 4 | local parsed_url = url.parse(value) 5 | if parsed_url.scheme and parsed_url.host then 6 | parsed_url.scheme = parsed_url.scheme:lower() 7 | if not (parsed_url.scheme == "http" or parsed_url.scheme == "https") then 8 | return false, "Supported protocols are HTTP and HTTPS" 9 | end 10 | end 11 | 12 | return true 13 | end 14 | 15 | return { 16 | fields = { 17 | authorize_url = {type = "url", required = true, func = validate_url}, 18 | token_url = {type = "url", required = true, func = validate_url}, 19 | user_url = {type = "url", required = true, func = validate_url}, 20 | client_id = {type = "string", required = true}, 21 | client_secret = {type = "string", required = true}, 22 | scope = {type = "string", default = ""}, 23 | user_keys = {type = "array", default = {"username", "email"}}, 24 | user_info_periodic_check = {type = "number", required = true, default = 60}, 25 | hosted_domain = {type = "string", default = ""}, 26 | email_key = {type = "string", default = ""} 27 | } 28 | } 29 | --------------------------------------------------------------------------------