抓大厂app，发现各种抓不到，最后找到个脚本 hook 它在 java 层的收发包函数，也算是一种抓包方式。
更新：经过测试，透明代理方式也可以抓到包 -> 安卓上基于透明代理对特定APP抓包
找到hook点
r0capture 抓不到明文包，中间人抓包则会导致 app 请求不了网络数据，应该是做了证书绑定，试了几个 bypass ssl pinning 脚本也不管用，反编译发现它不是一般的对 okhttp 的混淆，而是自己封装实现了 okhttp ，用 adb logact 看到如下报错
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| 02-18 20:36:09.758 30350 31893 W System.err: com.bytedance.frameworks.baselib.network.http.cronet.impl.CronetIOException: :0|Exception in CronetUrlRequest: net::ERR_TTNET_APP_TIMED_OUT, ip=:0, details={...}, attempts= , dns=2003, connect=-1, ssl=-1, send=-1, proxy=-1, wait=-1, receive=-1, total=-1, reused=0, cached=0, response_content_len=0, total_bytes=0, is_proxy=0, QuicStreamError=0, QuicCloseS
02-08 18:04:01.543 3477 4560 W System.err: at X.796.execute(SourceFile:524816)
02-08 18:04:01.543 3477 4560 W System.err: at com.bytedance.retrofit2.CallServerInterceptor.executeCall(SourceFile:33816611)
02-08 18:04:01.543 3477 4560 W System.err: at com.bytedance.retrofit2.CallServerInterceptor.intercept(SourceFile:17236173)
02-08 18:04:01.543 3477 4560 W System.err: at com.bytedance.retrofit2.intercept.RealInterceptorChain.proceed(SourceFile:17170567)
02-08 18:04:01.543 3477 4560 W System.err: at com.bytedance.frameworks.baselib.network.http.retrofit.RequestVertifyInterceptor.intercept(SourceFile:17104962)
02-08 18:04:01.543 3477 4560 W System.err: at com.bytedance.retrofit2.intercept.RealInterceptorChain.proceed(SourceFile:17170567)
02-08 18:04:01.543 3477 4560 W System.err: at X.0fr.intercept(SourceFile:17104974)
|
看看类 X.796 的 execute 方法，可以确定在这里发送请求并且拿到数据，那么 hook 这里同时打印 request 和 response
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| public Response execute() throws IOException {
...
String url = this.request.getUrl();
if (!this.f82341g) {
...
try {
int code = getCode(SsCronetHttpClient.processExecute(this.request, this.httpURLConnection));
this.baseHttpRequestInfo.responseBack = System.currentTimeMillis();
this.baseHttpRequestInfo.recycleCount = -1;
this.f82339e = SsCronetHttpClient.processAfterExecute(this.httpURLConnection, this.baseHttpRequestInfo, code);
this.f82345k = SsCronetHttpClient.getHeaderValueIgnoreCase(this.httpURLConnection, "Content-Type");
if (this.request.isResponseStreaming()) {
...
} else {
int maxLength2 = this.request.getMaxLength();
this.baseHttpRequestInfo.contentType = SsCronetHttpClient.getContentBaseType(this.f82345k);
typedByteArray = new TypedByteArray(this.f82345k, SsCronetHttpClient.processResponse(url, maxLength2, this.httpURLConnection, this.f82338d, this.baseHttpRequestInfo, this.f82339e, code, this.f82343i), new String[0]);
}
Response response = new Response(url, code, this.httpURLConnection.getResponseMessage(), SsCronetHttpClient.createHeaders(this.httpURLConnection, f82333l), typedByteArray);
response.setExtraInfo(this.baseHttpRequestInfo);
...
return response;
} catch (Exception e2) {
...
}
throw new IOException("request canceled");
}
|
脚本hook
刚好找到一位大佬的代码：aweme_httpcat.js
拿来改成对 X.796.execute 的 hook
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| function getObjClassName(obj) {
var jclazz = Java.use("java.lang.Class");
var jobj = Java.use("java.lang.Object");
return jclazz.getName.call(jobj.getClass.call(obj));
}
var fileFilterArray = [".webp",".png",".jpg",".jpeg",".image"]
function isBlackListUrl(url) {
for (var i = 0; i < fileFilterArray.length; i++) {
if (url.indexOf(fileFilterArray[i]) != -1) {
console.log(url + " ?? " + fileFilterArray[i])
return true;
}
}
return false;
}
function splitLine(string, tag) {
var lineLength = 150;
var newSB = Java.use("java.lang.StringBuilder").$new()
var newString = Java.use("java.lang.String").$new(string)
var lineNum = Math.ceil(newString.length() / lineLength)
for (var i = 0; i < lineNum; i++) {
var start = i * lineLength;
var end = (i + 1) * lineLength
newSB.append(tag)
if (end > newString.length()) {
newSB.append(newString.substring(start, newString.length()))
} else {
newSB.append(newString.substring(start, end))
}
newSB.append("\n")
}
return newSB.deleteCharAt(newSB.length() - 1).toString()
}
function main() {
Java.perform(function () {
Java.openClassFile("/data/local/tmp/dexfile/okhttpfind.dex").load();
var class_string = Java.use("java.lang.String");
var class_integer = Java.use("java.lang.Integer");
var class_stringBuffer = Java.use("java.lang.StringBuffer");
var class_jsonObject = Java.use("org.json.JSONObject");
var class_JavaLinkedTreeMap = Java.use("com.singleman.gson.internal.LinkedTreeMap");
var class_byteString = Java.use("com.singleman.okio.ByteString");
var class_byteArrayOutputStream = Java.use("java.io.ByteArrayOutputStream");
var class_javaMap = Java.use("java.util.Map");
var gson = Java.use("com.singleman.gson.Gson").$new();
var X796 = Java.use("X.796");
var fields = X796.class.getDeclaredFields();
var requestField = null;
for (var field of fields) {
field.setAccessible(true);
if (class_string.$new("f").equals(field.getName())) {
requestField = field;
}
}
X796["execute"].implementation = function () {
var response = this.execute();
if (response == null) {
console.log('can not find response field');
return response;
}
var request = Java.cast(requestField.get(this), Java.use("com.bytedance.retrofit2.client.Request"));
if (request == null) {
console.log('can not find request field');
return response;
}
var logString = class_stringBuffer.$new();
logString.append("").append("\n");
logString.append("┌────────────────────────────────────────────────────────────────────────────────────────────────────────────────────").append("\n").append("\n");
var url = request.getUrl();
if (url == null) {
url = "null";
}
logString.append("| URL").append("\n");
logString.append(splitLine(url, "| ")).append("\n");
if (isBlackListUrl(url)) {
logString.append("└────────────────────────────────────────────────────────────────────────────────────────────────────────────────────").append("\n").append("\n");
logString.append("").append("\n").append("\n");
console.log(logString);
return response;
}
var extraInfo = response.getExtraInfo();
if (extraInfo != null) {
var requestLogString = extraInfo.getClass().getField("requestLog").get(extraInfo);
if (null != requestLogString) {
var jsonObject = class_jsonObject.$new(requestLogString);
var baseJsonObj = jsonObject.getJSONObject("base");
var httpMethod = baseJsonObj.getString("method");
var originUrl = baseJsonObj.getString("origin_url");
logString.append("| ").append("\n");
logString.append("| " + "Method : " + httpMethod + " originUrl : " + originUrl).append("\n");
}
var requestHeadersString = extraInfo.getClass().getField("requestHeaders").get(extraInfo);
logString.append("| ").append("\n");
logString.append("| " + "Request Headers").append("\n");
var requestHeaderMapObj = gson.fromJson(requestHeadersString, class_javaMap.class);
var requestHeaderMap = Java.cast(requestHeaderMapObj, class_JavaLinkedTreeMap);
var keyArray = requestHeaderMap.keySet().toArray();
for (var i = 0; i < keyArray.length; i++) {
var key = keyArray[i];
var value = requestHeaderMap.get(key);
logString.append("| " + key + ":" + value).append("\n");
}
}
var requestBody = request.getBody();
if (null != requestBody) {
logString.append("| ").append("\n");
logString.append("| " + "Request Body").append("\n");
var byteArrayOutputStream = class_byteArrayOutputStream.$new();
requestBody["writeTo"](byteArrayOutputStream);
var bodyString = "";
try {
var bodyByteString = class_byteString.of(byteArrayOutputStream.toByteArray());
bodyString = bodyByteString.utf8();
}
catch (error) {
bodyString = "Base64[" + bodyByteString.base64() + "]";
}
logString.append(splitLine(bodyString, "| ")).append("\n");
}
var code = response.getStatus();
logString.append("| ").append("\n");
logString.append("| ").append("\n");
logString.append("| " + "code : " + code).append("\n");
if (extraInfo != null) {
var responseHeadersString = extraInfo.getClass().getField("responseHeaders").get(extraInfo);
logString.append("| ").append("\n");
logString.append("| " + "Response Headers").append("\n");
var responseHeaderMapObj = gson.fromJson(responseHeadersString, class_javaMap.class);
var responseHeaderMap = Java.cast(responseHeaderMapObj, class_JavaLinkedTreeMap);
var keyArray = responseHeaderMap.keySet().toArray();
for (var i = 0; i < keyArray.length; i++) {
var key = keyArray[i];
var value = responseHeaderMap.get(key);
logString.append("| " + key + ":" + value).append("\n");
}
}
var responseBody = response["getBody"]();
logString.append("| ").append("\n");
logString.append("| " + "mimeType : " + responseBody["mimeType"]()).append("\n");
logString.append("| ").append("\n");
logString.append("| " + "Body").append("\n");
var inputSteam = responseBody.in();
var length = responseBody.length();
var lengthInt = class_integer.valueOf(class_string.valueOf(length));
if (responseBody.$className.indexOf("TypedByteArray") != -1) {
var byteString = class_byteString.read(inputSteam, lengthInt["intValue"]());
var bodyString = "";
try {
bodyString = byteString.utf8();
}
catch (error) {
bodyString = "Base64[" + byteString.base64() + "]";
}
logString.append(splitLine(bodyString, "| ")).append("\n");
}
else {
var toString = responseBody.toString();
logString.append("| " + "respone body [Unknow Type] : " + responseBody.$className + " toString:" + toString).append("\n");
}
console.log(logString);
return response;
};
});
}
if (Java.available) {
console.log("available");
main();
}
|
效果不错
结束
像这种有强大开发能力的大厂会实现自己的 http 请求库，常规的针对 okhttp 的 hook 就不管用了，如果想抓到明文包可以考虑找到 app 在 java 层收发包函数，然后 hook 打印。
