@aikidosec/firewall/vulnerabilities/ssrf/checkContextForSSRF.js

Zen by Aikido is an embedded Web Application Firewall that autonomously protects Node.js apps against common and critical attacks

"use strict";
Object.defineProperty(exports, "__esModule", { value: true });
exports.checkContextForSSRF = checkContextForSSRF;
const Source_1 = require("../../agent/Source");
const attackPath_1 = require("../../helpers/attackPath");
const extractStringsFromUserInputCached_1 = require("../../helpers/extractStringsFromUserInputCached");
const containsPrivateIPAddress_1 = require("./containsPrivateIPAddress");
const findHostnameInUserInput_1 = require("./findHostnameInUserInput");
const getMetadataForSSRFAttack_1 = require("./getMetadataForSSRFAttack");
const isRequestToItself_1 = require("./isRequestToItself");
/**
 * This function goes over all the different input types in the context and checks
 * if it possibly implies SSRF, if so the function returns an InterceptorResult
 */
function checkContextForSSRF({ hostname, port, operation, context, }) {
    // If the hostname is not a private IP address, we don't need to iterate over the user input
    // DNS lookup calls will be inspected somewhere else
    // This is just to inspect direct invocations of `http.request` and similar
    // Where the hostname might be a private IP address (or localhost)
    if (!(0, containsPrivateIPAddress_1.containsPrivateIPAddress)(hostname)) {
        return;
    }
    if (context.url &&
        (0, isRequestToItself_1.isRequestToItself)({
            serverUrl: context.url,
            outboundHostname: hostname,
            outboundPort: port,
        })) {
        // We don't want to block outgoing requests to the same host as the server
        // (often happens that we have a match on headers like `Host`, `Origin`, `Referer`, etc.)
        return undefined;
    }
    for (const source of Source_1.SOURCES) {
        const userInput = (0, extractStringsFromUserInputCached_1.extractStringsFromUserInputCached)(context, source);
        if (!userInput) {
            continue;
        }
        for (const str of userInput) {
            const found = (0, findHostnameInUserInput_1.findHostnameInUserInput)(str, hostname, port);
            if (found) {
                const paths = (0, attackPath_1.getPathsToPayload)(str, context[source]);
                return {
                    operation: operation,
                    kind: "ssrf",
                    source: source,
                    pathsToPayload: paths,
                    metadata: (0, getMetadataForSSRFAttack_1.getMetadataForSSRFAttack)({ hostname, port }),
                    payload: str,
                };
            }
        }
    }
}