├── .prettierrc.js ├── .eslintrc ├── config ├── default.toml ├── tls-cert.pem ├── arc-key.pem └── tls-key.pem ├── README.md ├── package.json ├── .gitignore ├── server.js └── LICENSE /.prettierrc.js: -------------------------------------------------------------------------------- 1 | module.exports = { 2 | printWidth: 160, 3 | tabWidth: 4, 4 | singleQuote: true, 5 | endOfLine: 'lf', 6 | trailingComma: 'none', 7 | arrowParens: 'avoid' 8 | }; 9 | -------------------------------------------------------------------------------- /.eslintrc: -------------------------------------------------------------------------------- 1 | { 2 | "rules": { 3 | "indent": 0, 4 | "no-await-in-loop": 0, 5 | "require-atomic-updates": 0 6 | }, 7 | "globals": { 8 | "BigInt": true 9 | }, 10 | "extends": ["nodemailer", "prettier"], 11 | "parserOptions": { 12 | "ecmaVersion": 2020 13 | } 14 | } 15 | -------------------------------------------------------------------------------- /config/default.toml: -------------------------------------------------------------------------------- 1 | 2 | [mx] 3 | port = 2525 4 | host = "0.0.0.0" 5 | servername = false # defaults to os.hostname 6 | # localAddress = "1.2.3.4" 7 | 8 | [mx.tls] 9 | key = "config/tls-key.pem" 10 | cert = "config/tls-cert.pem" 11 | 12 | # virtual alias map 13 | [[addresses]] 14 | # address in this server 15 | address = "andris@example.com" 16 | # addresses to forward to, can be an empty array 17 | targets = ["andris@ethereal.email"] 18 | 19 | [arc] 20 | signingDomain = "example.com" 21 | selector = "dummy" 22 | privateKey = "config/arc-key.pem" -------------------------------------------------------------------------------- /README.md: -------------------------------------------------------------------------------- 1 | # forward 2 | 3 | Example email forwarder with ARC support 4 | 5 | ## Usage 6 | 7 | 1. Generate certificate/key files for STARTTLS and ARC signing 8 | 2. Edit [configuration file](config/default.toml), set port nr (should be 25) and key locations. Also configure virtual alias map 9 | 3. Install dependencies with `npm install` 10 | 4. Run the app `sudo node server.js` (sudo is required for port 25) 11 | 12 | ## Example 13 | 14 | See an example message forwarded via this forwarding service running at forward.srv.dev [here](https://gist.github.com/andris9/029ee50e586d884ea2acd8181f64e6e0). Check out the `ARC-*` headers in that message. 15 | -------------------------------------------------------------------------------- /package.json: -------------------------------------------------------------------------------- 1 | { 2 | "name": "forward", 3 | "private": true, 4 | "version": "1.0.0", 5 | "description": "example mail forwarder with ARC support", 6 | "main": "server.js", 7 | "scripts": { 8 | "start": "node server.js" 9 | }, 10 | "repository": { 11 | "type": "git", 12 | "url": "git+https://github.com/andris9/forward.git" 13 | }, 14 | "keywords": [], 15 | "author": "Andris Reinman", 16 | "license": "AGPL-3.0-or-later", 17 | "bugs": { 18 | "url": "https://github.com/andris9/forward/issues" 19 | }, 20 | "homepage": "https://github.com/andris9/forward#readme", 21 | "dependencies": { 22 | "mailauth": "1.0.8", 23 | "mx-connect": "^1.2.0", 24 | "nodemailer": "^6.4.14", 25 | "smtp-server": "3.7.0", 26 | "wild-config": "^1.5.1" 27 | } 28 | } 29 | -------------------------------------------------------------------------------- /config/tls-cert.pem: -------------------------------------------------------------------------------- 1 | -----BEGIN CERTIFICATE----- 2 | MIIC6DCCAdACCQCX5Zp9oCerBzANBgkqhkiG9w0BAQsFADA2MRAwDgYDVQQDDAdm 3 | b3J3YXJkMRUwEwYDVQQKDAxGb3J3YXJkIExURC4xCzAJBgNVBAYTAlVTMB4XDTIw 4 | MTEwNjA5MTYxMFoXDTIxMTEwNjA5MTYxMFowNjEQMA4GA1UEAwwHZm9yd2FyZDEV 5 | MBMGA1UECgwMRm9yd2FyZCBMVEQuMQswCQYDVQQGEwJVUzCCASIwDQYJKoZIhvcN 6 | AQEBBQADggEPADCCAQoCggEBAOgZBPQIxrk4TDucXULWVHq1mZY8pw8pUBerb3JO 7 | TskSiZaj+nTBlaywnMql3MifQfPv8NAOMa7PQ5iFTzrC+cXe1gbVqspde2Mo4fmS 8 | deC7FegSfsWev2sm9fr/Q+fcRFo/LXOTdQjH1XHMX8bkUcqqPRUafnwMdAm9dxvX 9 | KzqBzODPlN0XVD1Zfe5/NwzsrmK0jheqtGEwGwqMdravTNqq41gKbdaXE7o7KWoi 10 | MPPPWSBsUmhzd+WfRaaYN6nd1s3VqWGuPyBbKyeSmXwl0ZI5TcF3CdUKSnxADWKf 11 | in1+PNv0UnAxklVbWj9Rx41b88INGp52OZRkbut6xORN2kkCAwEAATANBgkqhkiG 12 | 9w0BAQsFAAOCAQEAiGQyaDKu8+EtLZCeyQvkP4KqJjix15Sw9IGvH6o7X/aGr3N4 13 | eyVtJZycBTD4hD4uWSPb2nPAtqqWKssr70eZJDRynAa4VaXCp/k2ZohwXJq2OfJ9 14 | zwA/lwdW9PEi/pYcdTNFiiznRNpTwFZukEWRm0KbDA/PI6BBwikxBcsL7/pIsxv6 15 | 7q9C//nzKOKUJEt+OWHZsqeMv3bweUL+1Dcw9YOvdJNAarmw7EMxAyZuzHiNn82j 16 | 7FQq/4yJlKPHPME8ZM4NOkwZJ3Qf2QodvX+TtaYlRLXWNtSXy+AutivnDNY1PkxK 17 | qMNTjZr99YDRSbLMcn6zR1h5IxHMb/4dwmnClw== 18 | -----END CERTIFICATE----- 19 | -------------------------------------------------------------------------------- /config/arc-key.pem: -------------------------------------------------------------------------------- 1 | -----BEGIN PRIVATE KEY----- 2 | MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQCUpHkYuijO5chw 3 | hPM7Okt5/htYcaEPk4E3KEJnRoIKR/0IoK+kBRguaIojZWl7io1VBFLWy0tmgFM8 4 | bcv9EB0pXgeNWkrgO+zrsSYb90Gkj1mjC8QreCBHCM5q+5PiWoUIP52PFeZH+XP1 5 | +JdnSPYVF5vbepFKYw7585gOuYUdZzdKlxWWsHhO7d8oOM3FVrGWt6w4txxECZUA 6 | 6ZpweZrKMNE5PD9eKXMSsmP65UCJwZh+zXQ2M/P4QviqBvZDJ9dO9SPl8hld6l13 7 | irV8cNV7k0ceBucwkc/PZi2pXzuCWNVQ3a+A3eebw+CQJTh6P8ADl2w0sSg5hSTU 8 | ryqR79S7AgMBAAECggEANDKFq99DkVQzzP+DApt4AcDwDWDptDSSPbJPj0C9Tar1 9 | +l+jDjATy8g+KivknNOMyfwYswD022vYzvGnnphYBTzV3heFD7U7f5DX1x4+2PDW 10 | A2GQY8ttWkSHaB4sUmKDMOBWDfccxM2eoRPI5yZB9Co0OyCRgNPEYJXgIduYGTiq 11 | uRNLZa/Pbe5wYk+tpOsHYlBbNZBmToK/xQwJQfgW6ssvNjG0yTWa+oz1rEIuy0Ka 12 | 94+H4iPH33gPTFV9sNlGfNXyXpDREHG7N/YOzEju0oRViy2y3rzcCG+lFopUR35j 13 | MY84YESdF59EZIvrBfs/795bP9XBYlLAlnme4nVPsQKBgQDFECgKMSoNYTvAWS9o 14 | UoOKAKoaZiBXSnD7AgVlvkHGULQxbPpjBB8IS9Prbi0MlunXyGT1j1AibBa4vWfc 15 | l97aHFrO+X9JG9jtUaclu9w5wC88wROteRqkcyQS4GC9Ph4PxqtAo2eGB/UMU50p 16 | iG0Qu6uEFLGJ0NRyyCys8ueUDQKBgQDBGRAFW0zURcCOK6bRoXKewAlexBDXipep 17 | /md2MTaNUVn8LPp6/Lsl1KQMA3/nzVzbI/iCA9IcCjoZ6+aaWAZdnckgb70wwMH/ 18 | Io9TH95poxsoVe2pv9Vg1BuwVGFOhpYAErloh8E0vxMx5leE/XSOobVduOSp6PHN 19 | pObPn73x5wKBgDygyuDP3XM+XgbAqaA7+rJDoBH9J6gThA0FwylZTp04CShHsgUy 20 | qGWCBtIhFIUSDSHRSpZuICZnANqXk1O/+dU68glJo4qXobbp7zXhxVCTOzVC5c3y 21 | O2sq7YdNNxYh/Ve3NMrvOxN2cUL4mprDmWKTiqJZR4HyGNqzkWMoXG0lAoGARlkf 22 | IRR2FQ+kayc0C0NKQtOrlj7P8/al8mSgxMqBGVL9+YVZa90PQWUKruXHf2et4Jhm 23 | PNevgE+pgzASP0C6cPi/AXYz8sMG6jBpDtuZZ9roVfWYNDOTRUeBHuhe2wDlPPmV 24 | WqO6m8DQ+Wj1kZnVEPGQ5agqhkw7a7Qb8qA7zxkCgYEAl9KVXXILK0DLP6nar6ZD 25 | Q9ylfZbrvkMYiey9bg1DviE5OQ7Q9k6aI5Osgvfra91ACWzC+a3mb4iAw6Yv88sU 26 | WivmD6srGLzusZsXeD4d2Cy0GRrFj/OtLHJx5umGxPRt1uLKc7ynDlmv8q7KqNe8 27 | ae6Y9RMhAV7iRB0KWdvVJM4= 28 | -----END PRIVATE KEY----- -------------------------------------------------------------------------------- /config/tls-key.pem: -------------------------------------------------------------------------------- 1 | -----BEGIN PRIVATE KEY----- 2 | MIIEvQIBADANBgkqhkiG9w0BAQEFAASCBKcwggSjAgEAAoIBAQDoGQT0CMa5OEw7 3 | nF1C1lR6tZmWPKcPKVAXq29yTk7JEomWo/p0wZWssJzKpdzIn0Hz7/DQDjGuz0OY 4 | hU86wvnF3tYG1arKXXtjKOH5knXguxXoEn7Fnr9rJvX6/0Pn3ERaPy1zk3UIx9Vx 5 | zF/G5FHKqj0VGn58DHQJvXcb1ys6gczgz5TdF1Q9WX3ufzcM7K5itI4XqrRhMBsK 6 | jHa2r0zaquNYCm3WlxO6OylqIjDzz1kgbFJoc3fln0WmmDep3dbN1alhrj8gWysn 7 | kpl8JdGSOU3BdwnVCkp8QA1in4p9fjzb9FJwMZJVW1o/UceNW/PCDRqedjmUZG7r 8 | esTkTdpJAgMBAAECggEBAL0jvmycRk2kekNNzpZsEVYabXoIHV/2m8VeOKje9cdY 9 | KvWu1aiWJUIgfvWJqt13IwkGbKkwF/7L+trtMD7Dq0Y7rRDOyKq2+Zk6NMTsPNGR 10 | xG1lvReQoY9Rpb0QjqcBUlZ1C7YW4ZXxO5jMIvTzFVBh4Ps0pwSyJVHWq5ztgNXg 11 | aenJJObOVmT4oIvhdX/3CdX7tJsgpvvanRpDJd1NwuQzd7HFfXrgZ3fELyO3kXS7 12 | FLpF7HcouJMgRycApkyC+M2W5N3xHubF3sLZmqdjVWtxIFM9qFj4E5IR7tfR3J8G 13 | /+kkm8HmAK29/wJ6cy9p1BOv3KiHJu6XkecGZb9zIvECgYEA9Qkhe3qUmsgyuz/j 14 | 4H9wy8//iqshUgHRYttYW+xQmgaKbe/rtaZXv1oX4jQwWwhymd0hH4CcJa1qubf0 15 | iRpryYkRzN9l+/ebnpj4izvzq/dUdGgEx2HitZqlFKQT5W5WRpCtJha1jha4dQbU 16 | ftjCBIIVLvg3zcL9OyNttKvYC90CgYEA8nuvba023QwHF8p2Cfsv+mG2G7VBem7Q 17 | 8ia8us99tLtVbkXk9n21fVHcKMS4vuLBb0TuEc1aHBual24eyLPg8fVCPc0I+xxD 18 | OHpLlyZTeecJ+FY65KoTOyh5GiBolXi/GP4d03anPswJqqhdWiT6KzyOS/c26Zto 19 | eZWm6anQh10CgYBP/WUSvBda19PH0LmBBdk6j3HqQKcl8DX8QYJ8r444Wb5C2Tln 20 | GSA39R8q1sKaVQ2kMM2pTQCsRAo9ClInl5psNfS7nonaUSBaC7HHMhD/qEPHpFU7 21 | CTdK9WrCbDWahgRgEMaVUoB+G+inO02PAw+DDTwBE0KURv0Hmy8q9ZYXeQKBgCEB 22 | 1yJt1q8GSRzi8WhwadqCXICvDqe01/pubXhccDce3QUyvHUVLZROhVKDXMaXJU+Z 23 | KXMA6ggzdbqxQb1+RtuI0CiLdXKBKWFRvGJp1Cke2wuT6VZhFFcULk/xI2tdUV38 24 | kWDMoP16VsKFQpfXuroR9yi+ERqBjhom1d6uv/T9AoGALnQZk0eOf9NYLb6slKWw 25 | 7G8rEvWXWvrPqPi9DBvfIDQu+tJ71fJKigpL93LId7CKy5qwpYvBKdLGiuUno2GR 26 | SbzWrF8x2Kjm9x8YlT6pZc2GoqhIexPnequ5ON9VR95W6RKcAVNefwK5/RdMph7O 27 | AD/Wly3rXLqsiSPi5eXSEwg= 28 | -----END PRIVATE KEY----- 29 | -------------------------------------------------------------------------------- /.gitignore: -------------------------------------------------------------------------------- 1 | # Logs 2 | logs 3 | *.log 4 | npm-debug.log* 5 | yarn-debug.log* 6 | yarn-error.log* 7 | lerna-debug.log* 8 | 9 | # Diagnostic reports (https://nodejs.org/api/report.html) 10 | report.[0-9]*.[0-9]*.[0-9]*.[0-9]*.json 11 | 12 | # Runtime data 13 | pids 14 | *.pid 15 | *.seed 16 | *.pid.lock 17 | 18 | # Directory for instrumented libs generated by jscoverage/JSCover 19 | lib-cov 20 | 21 | # Coverage directory used by tools like istanbul 22 | coverage 23 | *.lcov 24 | 25 | # nyc test coverage 26 | .nyc_output 27 | 28 | # Grunt intermediate storage (https://gruntjs.com/creating-plugins#storing-task-files) 29 | .grunt 30 | 31 | # Bower dependency directory (https://bower.io/) 32 | bower_components 33 | 34 | # node-waf configuration 35 | .lock-wscript 36 | 37 | # Compiled binary addons (https://nodejs.org/api/addons.html) 38 | build/Release 39 | 40 | # Dependency directories 41 | node_modules/ 42 | jspm_packages/ 43 | 44 | # TypeScript v1 declaration files 45 | typings/ 46 | 47 | # TypeScript cache 48 | *.tsbuildinfo 49 | 50 | # Optional npm cache directory 51 | .npm 52 | 53 | # Optional eslint cache 54 | .eslintcache 55 | 56 | # Microbundle cache 57 | .rpt2_cache/ 58 | .rts2_cache_cjs/ 59 | .rts2_cache_es/ 60 | .rts2_cache_umd/ 61 | 62 | # Optional REPL history 63 | .node_repl_history 64 | 65 | # Output of 'npm pack' 66 | *.tgz 67 | 68 | # Yarn Integrity file 69 | .yarn-integrity 70 | 71 | # dotenv environment variables file 72 | .env 73 | .env.test 74 | 75 | # parcel-bundler cache (https://parceljs.org/) 76 | .cache 77 | 78 | # Next.js build output 79 | .next 80 | 81 | # Nuxt.js build / generate output 82 | .nuxt 83 | dist 84 | 85 | # Gatsby files 86 | .cache/ 87 | # Comment in the public line in if your project uses Gatsby and *not* Next.js 88 | # https://nextjs.org/blog/next-9-1#public-directory-support 89 | # public 90 | 91 | # vuepress build output 92 | .vuepress/dist 93 | 94 | # Serverless directories 95 | .serverless/ 96 | 97 | # FuseBox cache 98 | .fusebox/ 99 | 100 | # DynamoDB Local files 101 | .dynamodb/ 102 | 103 | # TernJS port file 104 | .tern-port 105 | -------------------------------------------------------------------------------- /server.js: -------------------------------------------------------------------------------- 1 | 'use strict'; 2 | 3 | const config = require('wild-config'); 4 | const { SMTPServer } = require('smtp-server'); 5 | const { authenticate } = require('mailauth'); 6 | const os = require('os'); 7 | const util = require('util'); 8 | const mxConnect = util.promisify(require('mx-connect')); 9 | const { createTransport } = require('nodemailer'); 10 | const fs = require('fs'); 11 | 12 | // override key files with key values 13 | config.arc = Object.assign(config.arc, { 14 | privateKey: fs.readFileSync(config.arc.privateKey) 15 | }); 16 | config.mx.tls = Object.assign(config.mx.tls, { 17 | key: fs.readFileSync(config.mx.tls.key), 18 | cert: fs.readFileSync(config.mx.tls.cert) 19 | }); 20 | 21 | const generateReceivedHeader = (session, hostname) => { 22 | return `Received: from ${session.remoteAddress} by ${hostname} with ${session.transmissionType} id ${session.id} 23 | ${new Date().toUTCString().replace(/GMT/, '+0000')}`; 24 | }; 25 | 26 | /** 27 | * Function to deliver email to forwarding destination 28 | * 29 | * @param {String} id Session ID for logging 30 | * @param {String} from Envelope RCPT TO address (can be empty) 31 | * @param {Object} to Recipient info 32 | * @param {String} to.original Initial MAIL TO address 33 | * @param {String} to.target Forarded MAIL FROM address 34 | * @param {Buffer} message RFC822 formatted message 35 | */ 36 | const forward = async (id, from, to, message) => { 37 | // deliver message to recipient 38 | 39 | console.log(`[${id}] Sending mail to ${to.target}`); 40 | 41 | let connection = await mxConnect({ 42 | target: to.target, 43 | localAddress: config.mx.localAddress, 44 | localHostname: config.mx.servername 45 | }); 46 | 47 | if (!connection?.socket) { 48 | console.error(`[${id}] Failed to get connection to MX of ${to}`); 49 | return; 50 | } 51 | 52 | let transporter = createTransport({ 53 | host: connection.hostname, 54 | port: connection.port, 55 | 56 | name: config.mx.servername, 57 | 58 | auth: false, 59 | debug: true, 60 | logger: true, 61 | 62 | connection: connection.socket 63 | }); 64 | 65 | message = Buffer.concat([ 66 | Buffer.from([`X-Forwarded-To: ${to.target}`, `X-Forwarded-For: ${to.original} ${to.target}`, `Delivered-To: ${to.original}`].join('\r\n') + '\r\n'), 67 | message 68 | ]); 69 | 70 | try { 71 | await transporter.sendMail({ 72 | envelope: { from, to: [to.target] }, 73 | raw: message 74 | }); 75 | } catch (err) { 76 | console.log(err); 77 | } 78 | }; 79 | 80 | /** 81 | * Function to generate authentication headers and calling forarding function for each target 82 | * 83 | * @param {Buffer} message RFC822 formatted message 84 | * @param {Object} session Session information from smtp-server 85 | */ 86 | const processMessage = async (message, session) => { 87 | const sender = (session.envelope.mailFrom && session.envelope.mailFrom.address) || ''; 88 | const { headers } = await authenticate(message, { 89 | ip: session.remoteAddress, // SMTP client IP 90 | helo: session.hostNameAppearsAs || session.clientHostname, // EHLO/HELO hostname 91 | mta: config.mx.servername || os.hostname(), // server processing this message, defaults to os.hostname() 92 | sender, // MAIL FROM address 93 | seal: config.arc 94 | }); 95 | 96 | // add message headers 97 | message = Buffer.concat([Buffer.from(headers), message]); 98 | 99 | // resolve recipients from virtual alias table 100 | 101 | let targetList = session.envelope.rcptTo.flatMap((rcpt, i) => { 102 | let list = config.addresses.find(addr => addr.address === rcpt.address); 103 | return list?.targets?.map(target => { 104 | return { 105 | original: rcpt.address, 106 | target 107 | }; 108 | }); 109 | }); 110 | 111 | for (let i = 0; i < targetList.length; i++) { 112 | let rcpt = targetList[i]; 113 | await forward(`${session.id}.${i + 1}`, sender, rcpt, message); 114 | } 115 | 116 | return session.id; 117 | }; 118 | 119 | // Setup server 120 | const server = new SMTPServer({ 121 | // log to console 122 | logger: true, 123 | secure: false, 124 | 125 | // StartTLS keys 126 | key: config.mx.tls.key, 127 | cert: config.mx.tls.cert, 128 | 129 | name: config.mx.servername, 130 | 131 | // not required but nice-to-have 132 | banner: 'Welcome to forwarder service', 133 | 134 | // disable STARTTLS to allow authentication in clear text mode 135 | disabledCommands: ['AUTH'], 136 | 137 | // Accept messages up to 10 MB 138 | size: 10 * 1024 * 1024, 139 | 140 | onMailFrom(address, session, callback) { 141 | // accept anything 142 | callback(); 143 | }, 144 | 145 | // Validate RCPT TO envelope address. Example allows all addresses that do not start with 'deny' 146 | // If this method is not set, all addresses are allowed 147 | onRcptTo(address, session, callback) { 148 | let err; 149 | 150 | // allow only targets listed in the config file 151 | if (!config.addresses.some(a => a.address === address.address)) { 152 | return callback(new Error('Unknown user')); 153 | } 154 | 155 | callback(); 156 | }, 157 | 158 | // Handle message stream 159 | onData(stream, session, callback) { 160 | let sender = (session.envelope.mailFrom && session.envelope.mailFrom.address) || ''; 161 | let transmissionHeaders = [`Return-Path: <${sender}>`, generateReceivedHeader(session, config.mx.servername || os.hostname())]; 162 | 163 | let chunks = [], 164 | chunklen = 0; 165 | 166 | transmissionHeaders.forEach(h => { 167 | let chunk = Buffer.from(h.replace(/\r?\n/g, '\r\n') + '\r\n'); 168 | chunks.push(chunk); 169 | chunklen += chunk.length; 170 | }); 171 | 172 | stream.on('readable', () => { 173 | let chunk; 174 | while ((chunk = stream.read()) !== null) { 175 | chunks.push(chunk); 176 | chunklen += chunk.length; 177 | } 178 | }); 179 | 180 | stream.on('end', () => { 181 | let err; 182 | if (stream.sizeExceeded) { 183 | err = new Error('Error: message exceeds fixed maximum allowed message size'); 184 | err.responseCode = 552; 185 | return callback(err); 186 | } 187 | 188 | const message = Buffer.concat(chunks, chunklen); 189 | processMessage(message, session) 190 | .then(queueId => callback(null, `Message queued as ${queueId}`)) 191 | .catch(err => { 192 | console.error(err); 193 | callback(err); 194 | }); 195 | }); 196 | } 197 | }); 198 | 199 | server.on('error', err => { 200 | console.log('Error occurred'); 201 | console.log(err); 202 | }); 203 | 204 | // start listening 205 | server.listen(config.mx.port, config.mx.host); 206 | -------------------------------------------------------------------------------- /LICENSE: -------------------------------------------------------------------------------- 1 | GNU AFFERO GENERAL PUBLIC LICENSE 2 | Version 3, 19 November 2007 3 | 4 | Copyright (C) 2007 Free Software Foundation, Inc. 5 | Everyone is permitted to copy and distribute verbatim copies 6 | of this license document, but changing it is not allowed. 7 | 8 | Preamble 9 | 10 | The GNU Affero General Public License is a free, copyleft license for 11 | software and other kinds of works, specifically designed to ensure 12 | cooperation with the community in the case of network server software. 13 | 14 | The licenses for most software and other practical works are designed 15 | to take away your freedom to share and change the works. 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Remote Network Interaction; Use with the GNU General Public License. 541 | 542 | Notwithstanding any other provision of this License, if you modify the 543 | Program, your modified version must prominently offer all users 544 | interacting with it remotely through a computer network (if your version 545 | supports such interaction) an opportunity to receive the Corresponding 546 | Source of your version by providing access to the Corresponding Source 547 | from a network server at no charge, through some standard or customary 548 | means of facilitating copying of software. This Corresponding Source 549 | shall include the Corresponding Source for any work covered by version 3 550 | of the GNU General Public License that is incorporated pursuant to the 551 | following paragraph. 552 | 553 | Notwithstanding any other provision of this License, you have 554 | permission to link or combine any covered work with a work licensed 555 | under version 3 of the GNU General Public License into a single 556 | combined work, and to convey the resulting work. The terms of this 557 | License will continue to apply to the part which is the covered work, 558 | but the work with which it is combined will remain governed by version 559 | 3 of the GNU General Public License. 560 | 561 | 14. Revised Versions of this License. 562 | 563 | The Free Software Foundation may publish revised and/or new versions of 564 | the GNU Affero General Public License from time to time. Such new versions 565 | will be similar in spirit to the present version, but may differ in detail to 566 | address new problems or concerns. 567 | 568 | Each version is given a distinguishing version number. If the 569 | Program specifies that a certain numbered version of the GNU Affero General 570 | Public License "or any later version" applies to it, you have the 571 | option of following the terms and conditions either of that numbered 572 | version or of any later version published by the Free Software 573 | Foundation. If the Program does not specify a version number of the 574 | GNU Affero General Public License, you may choose any version ever published 575 | by the Free Software Foundation. 576 | 577 | If the Program specifies that a proxy can decide which future 578 | versions of the GNU Affero General Public License can be used, that proxy's 579 | public statement of acceptance of a version permanently authorizes you 580 | to choose that version for the Program. 581 | 582 | Later license versions may give you additional or different 583 | permissions. However, no additional obligations are imposed on any 584 | author or copyright holder as a result of your choosing to follow a 585 | later version. 586 | 587 | 15. Disclaimer of Warranty. 588 | 589 | THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY 590 | APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT 591 | HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY 592 | OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, 593 | THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 594 | PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM 595 | IS WITH YOU. SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF 596 | ALL NECESSARY SERVICING, REPAIR OR CORRECTION. 597 | 598 | 16. Limitation of Liability. 599 | 600 | IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING 601 | WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS 602 | THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY 603 | GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE 604 | USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF 605 | DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD 606 | PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS), 607 | EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF 608 | SUCH DAMAGES. 609 | 610 | 17. Interpretation of Sections 15 and 16. 611 | 612 | If the disclaimer of warranty and limitation of liability provided 613 | above cannot be given local legal effect according to their terms, 614 | reviewing courts shall apply local law that most closely approximates 615 | an absolute waiver of all civil liability in connection with the 616 | Program, unless a warranty or assumption of liability accompanies a 617 | copy of the Program in return for a fee. 618 | 619 | END OF TERMS AND CONDITIONS 620 | 621 | How to Apply These Terms to Your New Programs 622 | 623 | If you develop a new program, and you want it to be of the greatest 624 | possible use to the public, the best way to achieve this is to make it 625 | free software which everyone can redistribute and change under these terms. 626 | 627 | To do so, attach the following notices to the program. It is safest 628 | to attach them to the start of each source file to most effectively 629 | state the exclusion of warranty; and each file should have at least 630 | the "copyright" line and a pointer to where the full notice is found. 631 | 632 | 633 | Copyright (C) 634 | 635 | This program is free software: you can redistribute it and/or modify 636 | it under the terms of the GNU Affero General Public License as published 637 | by the Free Software Foundation, either version 3 of the License, or 638 | (at your option) any later version. 639 | 640 | This program is distributed in the hope that it will be useful, 641 | but WITHOUT ANY WARRANTY; without even the implied warranty of 642 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 643 | GNU Affero General Public License for more details. 644 | 645 | You should have received a copy of the GNU Affero General Public License 646 | along with this program. If not, see . 647 | 648 | Also add information on how to contact you by electronic and paper mail. 649 | 650 | If your software can interact with users remotely through a computer 651 | network, you should also make sure that it provides a way for users to 652 | get its source. For example, if your program is a web application, its 653 | interface could display a "Source" link that leads users to an archive 654 | of the code. There are many ways you could offer source, and different 655 | solutions will be better for different programs; see section 13 for the 656 | specific requirements. 657 | 658 | You should also get your employer (if you work as a programmer) or school, 659 | if any, to sign a "copyright disclaimer" for the program, if necessary. 660 | For more information on this, and how to apply and follow the GNU AGPL, see 661 | . 662 | --------------------------------------------------------------------------------