Merge branch 'main' into feature/access-token-detector
This commit is contained in:
KMINGON
commit
ba98eef694
6 changed files with 335 additions and 142 deletions
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@ -2,138 +2,94 @@ import type { SDK } from "caido:plugin";
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import { Body, RequestSpec, type Request } from "caido:utils";
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export class PKCECheck {
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// 필요한 PKCE 파라미터 목록
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private readonly requiredPKCEKeys = ["client_id", "response_type", "code_challenge", "code_challenge_method"];
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// PKCE 취약점 테스트 메인 함수
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async test(sdk: SDK, req: Request): Promise<boolean> {
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const method = req.getMethod();
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const url = req.getUrl();
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// GET 요청이 아니면 검사하지 않음
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if (method !== "GET") {
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sdk.console.log("[PKCEDowngradeCheck] Not a GET request. Skipping.");
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return false;
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}
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const query = req.getQuery();
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const searchParams = new URLSearchParams(query);
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const requiredKeys = ["client_id", "response_type", "code_challenge", "code_challenge_method"];
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const searchParams = new URLSearchParams(req.getQuery());
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if (!requiredKeys.every((key) => searchParams.has(key))) {
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// 필수 PKCE 파라미터들이 모두 있는지 확인
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if (!this.requiredPKCEKeys.every(key => searchParams.has(key))) {
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sdk.console.log("[PKCEDowngradeCheck] Required PKCE parameters missing. Skipping.");
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return false;
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}
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const url = req.getUrl();
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// OpenID 여부 확인
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const isOpenID = searchParams.get("scope")?.includes("openid") || url.includes("id_token");
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const methodVal = searchParams.get("code_challenge_method");
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const challengeVal = searchParams.get("code_challenge");
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// 파라미터가 없으면 경고 리포트 생성
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if (!methodVal || !challengeVal) {
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sdk.console.log("[PKCEDowngradeCheck] code_challenge or method missing. Skipping.");
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await sdk.findings.create({
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title: isOpenID
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? "[WARN] OpenID Flow PKCE Parameters Missing"
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: "[WARN] OAuth2 Flow PKCE Parameters Missing",
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description: `PKCE parameters are missing or incomplete for ${url}. This may indicate a misconfiguration.`,
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request: req,
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reporter: "PKCE Checker",
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});
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await this.reportFinding(sdk, req, url, isOpenID, "[WARN] PKCE Parameters Missing", "PKCE parameters are missing or incomplete.");
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return false;
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}
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// code_challenge_method가 'plain'이면 취약할 수 있음
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if (methodVal === "plain") {
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sdk.console.log("[PKCEDowngradeCheck] code_challenge_method is 'plain'. Skipping.");
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await sdk.findings.create({
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title: isOpenID
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? "[WARN] OpenID Flow PKCE Method is 'plain'"
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: "[WARN] OAuth2 Flow PKCE Method is 'plain'",
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description: `PKCE method is set to 'plain' for ${url}. This may indicate a downgrade vulnerability.`,
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request: req,
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reporter: "PKCE Checker",
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});
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await this.reportFinding(sdk, req, url, isOpenID, "[WARN] PKCE Method is 'plain'", "PKCE method is set to 'plain'. This may indicate a downgrade vulnerability.");
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return false;
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}
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// Remove PKCE parameters to simulate a downgraded request
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// PKCE 관련 파라미터 제거하여 다운그레이드된 URL 생성
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searchParams.delete("code_challenge");
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searchParams.delete("code_challenge_method");
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const downgradedQuery = searchParams.toString();
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const scheme = req.getUrl().startsWith("https") ? "https" : "http";
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const scheme = url.startsWith("https") ? "https" : "http";
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const downgradedUrl = `${scheme}://${req.getHost()}:${req.getPort()}${req.getPath()}?${downgradedQuery}`;
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sdk.console.log(`${req.getHost()} Original URL: ` + url);
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sdk.console.log(`${req.getHost()} Downgraded URL: ` + downgradedUrl);
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sdk.console.log(`${req.getHost()} Original URL: ${url}`);
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sdk.console.log(`${req.getHost()} Downgraded URL: ${downgradedUrl}`);
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try {
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// Use Caido Replay SDK to replay the original request
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const spec = new RequestSpec(downgradedUrl);
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spec.setBody(req.getBody() as Body);
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for (const [key, value] of Object.entries(req.getHeaders())) {
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if (Array.isArray(value)) {
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spec.setHeader(key, value.join(', ')); // or another suitable delimiter
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} else {
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spec.setHeader(key, value);
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// 원래 요청과 다운그레이드된 요청 각각 전송
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const downgradedResponse = await this.sendRequest(sdk, req, downgradedUrl, downgradedQuery);
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const originalResponse = await this.sendRequest(sdk, req, url, req.getQuery());
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if (downgradedResponse && originalResponse) {
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const originalCode = originalResponse.getCode();
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const downgradedCode = downgradedResponse.getCode();
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const originalLoc = originalResponse.getHeader("location") || "";
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const downgradedLoc = downgradedResponse.getHeader("location") || "";
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sdk.console.log(`${req.getHost()} Original Status: ${originalCode}`);
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sdk.console.log(`${req.getHost()} Downgraded Status: ${downgradedCode}`);
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sdk.console.log(`${req.getHost()} Original Location: ${originalLoc}`);
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sdk.console.log(`${req.getHost()} Downgraded Location: ${downgradedLoc}`);
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// 두 응답 모두 리디렉션이면서 code= 파라미터 포함 시 취약점 리포트 생성
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const bothRedirect = [301, 302].includes(originalCode) && [301, 302].includes(downgradedCode);
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const bothContainCode = originalLoc.includes("code=") && downgradedLoc.includes("code=");
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if (bothRedirect && bothContainCode) {
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const title = isOpenID
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? "[CRITICAL] OpenID Flow PKCE Downgrade Vulnerability"
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: "[CRITICAL] OAuth2 Flow PKCE Downgrade Vulnerability";
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const reference = isOpenID
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? "https://openid.net/specs/openid-igov-oauth2-1_0-02.html#rfc.section.3.1.7"
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: "https://datatracker.ietf.org/doc/html/rfc7636";
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await sdk.findings.create({
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title,
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description: `PKCE downgrade vulnerability detected!\n\nOriginal URL: ${url}\nDowngraded URL: ${downgradedUrl}\n\nBoth requests returned authorization codes, indicating the server accepts requests without PKCE protection.\n\nReference: ${reference}`,
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request: req,
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reporter: "PKCE Checker",
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});
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return true;
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}
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}
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spec.setHost(req.getHost());
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spec.setMethod(req.getMethod());
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spec.setPath(req.getPath());
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spec.setQuery(downgradedQuery);
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spec.setTls(req.getTls());
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spec.setPort(req.getPort());
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let sendDowngradedRequest = await sdk.requests.send(spec);
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if (sendDowngradedRequest.response) {
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let domain = spec.getHost();
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let port = spec.getPort();
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let path = spec.getPath();
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let query = spec.getQuery();
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let id = sendDowngradedRequest.response.getId();
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let code = sendDowngradedRequest.response.getCode();
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sdk.console.log(`REQ ${id}: ${domain}:${port}${path}${query} received a status code of ${code}`);
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}
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if (sendDowngradedRequest.response?.getCode() === 302) {
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await sdk.findings.create({
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title: isOpenID
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? "[CRITICAL] OpenID Flow PKCE Downgrade Vulnerability"
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: "[CRITICAL] OAuth2 Flow PKCE Downgrade Vulnerability",
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description: `The request to ${url} is vulnerable to a PKCE downgrade attack. This may indicate a configuration error.`,
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request: req,
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reporter: "PKCE Checker",
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});
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}
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/*
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sdk.console.log(`${req.getHost()} Original Status: ` + resOriginal.status);
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sdk.console.log(`${req.getHost()} Downgraded Status: ` + resDowngraded.status);
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sdk.console.log(`${req.getHost()} Original Headers: ` + JSON.stringify(resOriginal.headers));
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sdk.console.log(`${req.getHost()} Downgraded Headers: ` + JSON.stringify(resDowngraded.headers));
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// Caido Dev Docs 기준으로, 리다이렉트된 URL은 Response 객체의 url 속성에 저장되어 있음
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const locationOriginal = resOriginal.url ?? "";
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const locationDowngraded = resDowngraded.url ?? "";
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sdk.console.log(`${req.getHost()} Original Location: ` + locationOriginal);
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sdk.console.log(`${req.getHost()} Downgraded Location: ` + locationDowngraded);
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const statusEqual = resOriginal.status === resDowngraded.status;
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const codeInRedirects = locationOriginal.includes("code=") && locationDowngraded.includes("code=");
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if (statusEqual && codeInRedirects) {
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const title = isOpenID
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? "[CRITICAL] OpenID Flow PKCE Downgraded to Plaintext"
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: "[CRITICAL] OAuth2 Flow PKCE Downgraded to Plaintext";
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const reference = isOpenID
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? "https://openid.net/specs/openid-igov-oauth2-1_0-02.html#rfc.section.3.1.7"
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: "https://datatracker.ietf.org/doc/html/rfc7636";
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await sdk.findings.create({
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title,
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description: `PKCE downgrade detected for ${url}.\n\nDowngraded URL: ${downgradedUrl}\n\nRedirect contained code=.\n\nReference: ${reference}`,
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request: req,
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reporter: "",
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});
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return true;
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}*/
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} catch (err) {
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sdk.console.error(`PKCE downgrade check failed for ${url}: ${String(err)}`);
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}
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@ -141,4 +97,41 @@ export class PKCECheck {
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sdk.console.log("[PKCEDowngradeCheck] No PKCE downgrade detected.");
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return false;
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}
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// 요청 전송 도우미 함수
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private async sendRequest(sdk: SDK, req: Request, url: string, query: string) {
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const spec = new RequestSpec(url);
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spec.setMethod(req.getMethod());
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spec.setPath(req.getPath());
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spec.setQuery(query);
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spec.setBody(req.getBody() as Body);
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spec.setHost(req.getHost());
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spec.setPort(req.getPort());
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spec.setTls(req.getTls());
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for (const [key, value] of Object.entries(req.getHeaders())) {
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spec.setHeader(key, Array.isArray(value) ? value.join(', ') : value);
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}
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const result = await sdk.requests.send(spec);
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return result.response ?? null;
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}
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// 경고 리포트 생성 함수
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private async reportFinding(
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sdk: SDK,
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req: Request,
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url: string,
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isOpenID: boolean,
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title: string,
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message: string
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) {
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const fullTitle = isOpenID ? `[WARN] OpenID Flow ${title}` : `[WARN] OAuth2 Flow ${title}`;
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await sdk.findings.create({
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title: fullTitle,
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description: `${message} (${url})`,
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request: req,
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reporter: "PKCE Checker",
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});
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}
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}
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@ -7,13 +7,13 @@ const httpUtils = new HttpUtils();
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export class CsrfCheck {
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private isTargetUri(uri: string): boolean {
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if (
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uri.includes("client_id=") &&
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(uri.includes("response_type=") ||
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uri.includes("grant_type=") ||
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uri.includes("redirect_uri=") ||
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uri.includes("scope=") ||
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uri.includes("state=") ||
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uri.includes("nonce="))
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httpUtils.getQueryParamFromURI(uri, "client_id") !== null &&
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(httpUtils.getQueryParamFromURI(uri, "response_type") !== null ||
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httpUtils.getQueryParamFromURI(uri, "grant_type") !== null ||
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httpUtils.getQueryParamFromURI(uri, "redirect_uri") !== null ||
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httpUtils.getQueryParamFromURI(uri, "scope") !== null ||
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httpUtils.getQueryParamFromURI(uri, "state") !== null ||
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httpUtils.getQueryParamFromURI(uri, "nonce") !== null)
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) {
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return true;
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}
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@ -151,15 +151,25 @@ export class CsrfCheck {
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let result = ``;
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// 쿼리에 state 파라미터가 없으면 CSRF 위험
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if (this.isOauthUri(request) && !this.isStateInQuery(request)) {
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result += "CSRF risk: missing state parameter"; // CSRF risk: missing state parameter
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try {
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if (this.isOauthUri(request) && !this.isStateInQuery(request)) {
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result += "CSRF risk: missing state parameter"; // CSRF risk: missing state parameter
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}
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} catch (error) {
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sdk.console.error(`Error checking state in query: ${error}`);
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}
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// location 헤더에 state 파라미터가 없거나, 요청에서 보낸 state와 다르면 CSRF 위험
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const stateAtResponseLocationHeaderCheck =
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this.checkStateAtResponseLocationHeader(request, response);
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if (stateAtResponseLocationHeaderCheck !== 0) {
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result += `, ${stateAtResponseLocationHeaderCheck.join(", ")}`;
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try {
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const stateAtResponseLocationHeaderCheck =
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this.checkStateAtResponseLocationHeader(request, response);
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if (stateAtResponseLocationHeaderCheck !== 0) {
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result += `, ${stateAtResponseLocationHeaderCheck.join(", ")}`;
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}
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} catch (error) {
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sdk.console.error(
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`Error checking state in response location header: ${error}`
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);
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}
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// // 처음으로 state를 발급한 요청에서 state 파라미터를 바꿔서 보내기
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@ -168,13 +178,19 @@ export class CsrfCheck {
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// result += `, ${reusedStateCheck.join(", ")}`;
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// }
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if (result) {
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await sdk.findings.create({
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title: "csrf vuln",
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description: `SSO-related parameters detected in response:\n\n${request.getMethod()} ${request.getUrl()} : ${result}`,
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request,
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reporter: "csrf reporter",
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});
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result.replace(/^\s*,\s*|\s*$/, ""); // Remove leading/trailing commas
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try {
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if (result) {
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await sdk.findings.create({
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title: "csrf vuln",
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description: `SSO-related parameters detected in response:\n\n${request.getMethod()} ${request.getUrl()} : ${result}`,
|
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request,
|
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reporter: "csrf reporter",
|
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});
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sdk.console.log("qq");
|
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}
|
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} catch (error) {
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sdk.console.error(`Error creating finding: ${error}`);
|
||||
}
|
||||
}
|
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}
|
||||
|
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59
packages/backend/src/controller/redirect_uriBypass.ts
Normal file
59
packages/backend/src/controller/redirect_uriBypass.ts
Normal file
|
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@ -0,0 +1,59 @@
|
|||
import type { Request, Response } from "caido:utils";
|
||||
import type { SDK } from "caido:plugin";
|
||||
|
||||
export class RedirectBypassController {
|
||||
// redirect_uri를 확인하는 함수
|
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isRedirectUri(req: Request): { detected: boolean; redirectUri?: string } {
|
||||
// ? 뒤에 오는 파라미터 모두 가져오고, 정규표현식으로 redirect_uri= 이후 주소만 뽑음(없으면 null)
|
||||
const query = req.getQuery();
|
||||
const redirectUriMatch = query.match(/redirect_uri=([^&]+)/i);
|
||||
|
||||
// redirectUriMatch[1]은 ()로 감싼 부분
|
||||
// redirect_uri 파라미터가 없거나 있어도 주소가 문자열이 아니면 false
|
||||
if (!redirectUriMatch || typeof redirectUriMatch[1] !== "string") {
|
||||
return { detected: false };
|
||||
}
|
||||
|
||||
// 인코딩된 주소를 원래대로 바꿈 (ex. https://~~)
|
||||
const redirectUri = decodeURIComponent(redirectUriMatch[1]);
|
||||
|
||||
const bypassPatterns = [
|
||||
"%ff@", "／", "%2f@", "%0a@", "%0d@", "\\", ".evil.com", "@", "%2f..%2f",
|
||||
];
|
||||
|
||||
// 위 패턴에 일치하는 게 있으면 true랑 redirectUri 반환 (false일 땐 undefined)
|
||||
const detected = bypassPatterns.some(pattern => redirectUri.includes(pattern));
|
||||
return { detected, redirectUri: detected ? redirectUri : undefined };
|
||||
}
|
||||
|
||||
// 응답에 인가 코드가 포함되어 있는지 확인하는 함수
|
||||
isCodeIssued(res: Response): boolean {
|
||||
const location = res.getHeader("Location") || "";
|
||||
return location.includes("code=");
|
||||
}
|
||||
|
||||
// 위의 두 함수 모두 만족하면 true, 문제의 주소를 반환하는 함수
|
||||
test(req: Request, res: Response): { detected: boolean; redirectUri?: string } {
|
||||
const redirectCheck = this.isRedirectUri(req);
|
||||
const codeIssued = this.isCodeIssued(res);
|
||||
|
||||
if (redirectCheck.detected && codeIssued) {
|
||||
return { detected: true, redirectUri: redirectCheck.redirectUri };
|
||||
}
|
||||
|
||||
return { detected: false };
|
||||
}
|
||||
|
||||
// 탐지된 결과 저장하는 함수
|
||||
async testAsync(sdk: SDK, req: Request, res: Response): Promise<void> {
|
||||
const result = this.test(req, res);
|
||||
if (result.detected) {
|
||||
await sdk.findings.create({
|
||||
title: "Redirect URI Bypass Detected",
|
||||
description: `redirect_uri 우회 발견\nRedirect URI: ${result.redirectUri}`,
|
||||
request: req,
|
||||
reporter: "gyu",
|
||||
});
|
||||
}
|
||||
}
|
||||
}
|
||||
|
|
@ -6,36 +6,40 @@ import { CsrfCheck } from "./controller/csrfCheck";
|
|||
import { PKCECheck } from "./controller/PKCECheck";
|
||||
import { AccessTokenLeakController } from "./controller/accessTokenDetector";
|
||||
import { ScopeDetection } from "./controller/scopeDetection";
|
||||
import { NonceCheckController } from "./controller/nonceCheck";
|
||||
// import { NonceCheckController } from "./controller/nonceCheck";
|
||||
import { RedirectBypassController } from "./controller/redirect_uriBypass";
|
||||
|
||||
export type API = DefineAPI<{}>;
|
||||
|
||||
const csrfCheck = new CsrfCheck();
|
||||
// const implicitGrantController = new ImplicitGrantController();
|
||||
// const authZCodeGrantController = new AuthZCodeGrantController();
|
||||
const pkceCheckController = new PKCECheck();
|
||||
const tokenCheck = new AccessTokenLeakController();
|
||||
const ScopeDetectionController = new ScopeDetection();
|
||||
const nonceCheckController = new NonceCheckController();
|
||||
// const nonceCheckController = new NonceCheckController();
|
||||
const redirectBypassController = new RedirectBypassController();
|
||||
|
||||
export function init(sdk: SDK<API>) {
|
||||
sdk.events.onInterceptResponse(async (sdk, req: Request, res: Response) => {
|
||||
await csrfCheck.checker(sdk, req, res);
|
||||
await pkceCheckController.test(sdk, req);
|
||||
//await pkceCheckController.test(sdk, req);
|
||||
await tokenCheck.testReq(sdk, req);
|
||||
await tokenCheck.testResp(sdk, res, req);
|
||||
await ScopeDetectionController.scan(sdk, req.getUrl());
|
||||
await redirectBypassController.testAsync(sdk, req, res);
|
||||
|
||||
if (NonceCheckController.isOidcFlow(req, res)) {
|
||||
await sdk.findings.create({
|
||||
title: "OIDC Flow Detected",
|
||||
description: "The request appears to be part of an OIDC flow.",
|
||||
request: req,
|
||||
reporter: "",
|
||||
});
|
||||
}
|
||||
// if (NonceCheckController.isOidcFlow(req, res)) {
|
||||
// await sdk.findings.create({
|
||||
// title: "OIDC Flow Detected",
|
||||
// description: "The request appears to be part of an OIDC flow.",
|
||||
// request: req,
|
||||
// reporter: "",
|
||||
// });
|
||||
// }
|
||||
});
|
||||
|
||||
sdk.events.onInterceptRequest(async (sdk, req: Request) => {
|
||||
await pkceCheckController.test(sdk, req);
|
||||
});
|
||||
/*
|
||||
sdk.events.onInterceptRequest(async (sdk, req: Request) => {
|
||||
const result =
|
||||
|
|
|
|||
|
|
@ -48,8 +48,8 @@ export class HttpUtils {
|
|||
}
|
||||
|
||||
getQueryParamFromURI(uri: string, key: string): string | null {
|
||||
uri = uri.toLowerCase();
|
||||
key = key.toLowerCase();
|
||||
uri = this.decodeAndLower(uri);
|
||||
key = this.decodeAndLower(key);
|
||||
try {
|
||||
const urlObj = new URL(uri);
|
||||
return urlObj.searchParams.get(key);
|
||||
|
|
@ -66,8 +66,8 @@ export class HttpUtils {
|
|||
* @returns - 해당 파라미터 값, 없으면 null
|
||||
*/
|
||||
getQueryParam(query: string, key: string): string | null {
|
||||
query = query.toLowerCase();
|
||||
key = key.toLowerCase();
|
||||
query = this.decodeAndLower(query);
|
||||
key = this.decodeAndLower(key);
|
||||
|
||||
const params = new URLSearchParams(query);
|
||||
return params.get(key);
|
||||
|
|
@ -82,9 +82,9 @@ export class HttpUtils {
|
|||
* @returns - "a=1&b=2&c=3..." 형태의 새로운 쿼리 문자열
|
||||
*/
|
||||
setQueryParam(query: string, key: string, value: string): string {
|
||||
query = query.toLowerCase();
|
||||
key = key.toLowerCase();
|
||||
value = value.toLowerCase();
|
||||
query = this.decodeAndLower(query);
|
||||
key = this.decodeAndLower(key);
|
||||
value = this.decodeAndLower(value);
|
||||
|
||||
const params = new URLSearchParams(query);
|
||||
params.set(key, value);
|
||||
|
|
@ -99,8 +99,8 @@ export class HttpUtils {
|
|||
* @returns - 삭제된 상태의 새로운 쿼리 문자열
|
||||
*/
|
||||
removeQueryParam(query: string, key: string): string {
|
||||
query = query.toLowerCase();
|
||||
key = key.toLowerCase();
|
||||
query = this.decodeAndLower(query);
|
||||
key = this.decodeAndLower(key);
|
||||
|
||||
const params = new URLSearchParams(query);
|
||||
params.delete(key);
|
||||
|
|
|
|||
Loading…
Add table
Add a link
Reference in a new issue