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40 changes: 20 additions & 20 deletions
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...r.min-995634bcc05458654bf7d7764b948dca.js → ...r.min-9a614fcf6610a3db1a11c9b341a727e7.js
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,67 @@ | ||
| const got = require('got'); | ||
| const {URL} = require('url'); | ||
| const dns = require('dns'); | ||
| const common = require('./common'); | ||
| const ghostVersion = require('./ghost-version'); | ||
| const config = require('../config'); | ||
| const validator = require('../data/validation').validator; | ||
|
|
||
| function isPrivateIp(addr) { | ||
| return /^(::f{4}:)?10\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) || | ||
| /^(::f{4}:)?192\.168\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) || | ||
| /^(::f{4}:)?172\.(1[6-9]|2\d|30|31)\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) || | ||
| /^(::f{4}:)?127\.([0-9]{1,3})\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) || | ||
| /^(::f{4}:)?169\.254\.([0-9]{1,3})\.([0-9]{1,3})$/i.test(addr) || | ||
| /^f[cd][0-9a-f]{2}:/i.test(addr) || | ||
| /^fe80:/i.test(addr) || | ||
| /^::1$/.test(addr) || | ||
| /^::$/.test(addr); | ||
| } | ||
|
|
||
| function errorIfHostnameResolvesToPrivateIp(options) { | ||
| // allow requests through to local Ghost instance | ||
| const siteUrl = new URL(config.get('url')); | ||
| const requestUrl = new URL(options.href); | ||
| if (requestUrl.host === siteUrl.host) { | ||
| return Promise.resolve(); | ||
| } | ||
|
|
||
| dns.lookup(options.hostname, {}, (err, address) => { | ||
| if (err) { | ||
| throw err; | ||
| } | ||
|
|
||
| if (isPrivateIp(address)) { | ||
| throw new common.errors.InternalServerError({ | ||
| message: 'URL resolves to a non-permitted private IP block', | ||
| code: 'URL_PRIVATE_INVALID', | ||
| context: options.href | ||
| }); | ||
| } | ||
|
|
||
| return Promise.resolve(); | ||
| }); | ||
| } | ||
|
|
||
| // same as our normal request lib but if any request in a redirect chain resolves | ||
| // to a private IP address it will be blocked before the request is made. | ||
| const externalRequest = got.extend({ | ||
| headers: { | ||
| 'user-agent': 'Ghost/' + ghostVersion.original + ' (https://github.com/TryGhost/Ghost)' | ||
| }, | ||
| hooks: { | ||
| init: [(options) => { | ||
| if (!options.hostname || !validator.isURL(options.hostname)) { | ||
| throw new common.errors.InternalServerError({ | ||
| message: 'URL empty or invalid.', | ||
| code: 'URL_MISSING_INVALID', | ||
| context: options.href | ||
| }); | ||
| } | ||
| }], | ||
| beforeRequest: [errorIfHostnameResolvesToPrivateIp], | ||
| beforeRedirect: [errorIfHostnameResolvesToPrivateIp] | ||
| } | ||
| }); | ||
|
|
||
| module.exports = externalRequest; |
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