59 lines
1.3 KiB
Plaintext
59 lines
1.3 KiB
Plaintext
=== How to fix it in Node.js
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The following code is vulnerable to SSRF as it opens a URL defined by untrusted data.
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==== Noncompliant code example
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[source,javascript,diff-id=1,diff-type=noncompliant]
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----
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const axios = require('axios');
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const express = require('express');
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const app = express();
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app.get('/example', async (req, res) => {
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try {
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await axios.get(req.query.url); // Noncompliant
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res.send("OK");
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} catch (err) {
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console.error(err);
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res.send("ERROR");
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}
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})
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----
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==== Compliant solution
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[source,javascript,diff-id=1,diff-type=compliant]
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----
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const axios = require('axios');
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const express = require('express');
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const schemesList = ["http:", "https:"];
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const domainsList = ["trusted1.example.com", "trusted2.example.com"];
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app.get('/example', async (req, res) => {
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const url = (new URL(req.query.url));
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if (schemesList.includes(url.protocol) && domainsList.includes(url.hostname)) {
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try {
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await axios.get(url);
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res.send("OK");
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} catch (err) {
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console.error(err);
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res.send("ERROR");
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}
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}else {
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res.send("INVALID_URL");
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}
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})
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----
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include::../../common/fix/how-does-this-work.adoc[]
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The compliant code example uses such an approach.
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=== Pitfalls
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include::../../common/pitfalls/starts-with.adoc[]
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