# Introduction · AnyProxy
Author: AnyProxy

# AnyProxy

AnyProxy is a fully configurable http/https proxy in NodeJS.

Ref: 中文文档

Github:

- https://github.com/alibaba/anyproxy

Features:

- Offer you the ablity to handle http traffic by invoking a js module
- Intercept https
- GUI webinterface

Change Logs since 3.x:

- Support Promise and Generator in rule module
- Simplified interface in rule module
- A newly designed web interface

# Getting Start

### install

To Debian and Ubuntu users, you may need to install `nodejs-legacy` at the same time

    sudo apt-get install nodejs-legacy

Then install the AnyProxy

    npm install -g anyproxy

### launch

- start AnyProxy in command line, with default port 8001

    anyproxy

- now you can use http proxy server by 127.0.0.1:8001
- visit http://127.0.0.1:8002 to see the http requests

### options

- specify the port of http proxy

    anyproxy --port 1080

### Use AnyProxy as an npm module

AnyProxy can be used as an npm module

> To enable https feature, please guide users to use `anyproxy-ca` in cli. Or use methods under `AnyProxy.utils.certMgr` to generate certificates.

- install

    npm i anyproxy --save

- sample

    const AnyProxy = require('anyproxy');
    const options = {
      port: 8001,
      rule: require('myRuleModule'),
      webInterface: {
        enable: true,
        webPort: 8002,
        wsPort: 8003,
      },
      throttle: 10000,
      forceProxyHttps: false,
      silent: false
    };
    const proxyServer = new AnyProxy.ProxyServer(options);

    proxyServer.on('ready', () => { /* */ });
    proxyServer.on('error', (e) => { /* */ });
    proxyServer.start();

    //when finished
    proxyServer.close();

- Class: AnyProxy.proxyServer

  - create a proxy server

        const proxy = new AnyProxy.proxyServer(options)

  - `options`

    - `port` {number} required, port number of proxy server
    - `rule` {object} your rule module
    - `throttle` {number} throttle in kb/s, unlimited for default
    - `forceProxyHttps` {boolean} in force intercept all https request, false for default
    - `silent` {boolean} if keep silent in console, false for default`false`
    - `dangerouslyIgnoreUnauthorized` {boolean} if ignore certificate error in request, false for default
    - `webInterface` {object} config for web interface
      - `enable` {boolean} if enable web interface, false for default
      - `webPort` {number} port number for web interface

  - Event: `ready`

    - emit when proxy server is ready
    - sample

        proxy.on('ready', function() { })

  - Event: `error`

    - emit when error happened inside proxy server
    - sample

        proxy.on('error', function() { })

  - Method: `start`

    - start proxy server
    - sample

        proxy.start();

  - Method: `close`

    - close proxy server
    - sample

        proxy.close();

- AnyProxy.utils.systemProxyMgr

  - manage the system proxy config. sudo password may be required
  - sample

      // set 127.0.0.1:8001 as system http server
      AnyProxy.utils.systemProxyMgr.enableGlobalProxy('127.0.0.1', '8001');

      // disable global proxy server
      AnyProxy.utils.systemProxyMgr.disableGlobalProxy();

- AnyProxy.utils.certMgr

  - Manage certificates of AnyProxy
  - `AnyProxy.utils.certMgr.ifRootCAFileExists()`
    - detect if AnyProx rootCA exists
  - `AnyProxy.utils.certMgr.generateRootCA(callback)`
    - generate a rootCA
  - Sample

        const AnyProxy = require('AnyProxy');
        const exec = require('child_process').exec;

        if (!AnyProxy.utils.certMgr.ifRootCAFileExists()) {
          AnyProxy.utils.certMgr.generateRootCA((error, keyPath) => {
            // let users to trust this CA before using proxy
            if (!error) {
              const certDir = require('path').dirname(keyPath);
              console.log('The cert is generated at', certDir);
              const isWin = /^win/.test(process.platform);
              if (isWin) {
                exec('start .', { cwd: certDir });
              } else {
                exec('open .', { cwd: certDir });
              }
            } else {
              console.error('error when generating rootCA', error);
            }
          });
        }

# Proxy Https

- AnyProxy does NOT intercept https requests by default. To view decrypted info, you have to config the CA certificate.

> Under the hood, AnyProxy decryptes https requests by man-in-the-middle attack. Users have to trust the CA cert in advance. Otherwise, client side will issue errors about unsecure network.

- generate certifycates and intercept

    anyproxy-ca #generate root CA. manually trust it after that.
    anyproxy --intercept #launch anyproxy and intercept all https traffic

- Appendix：how to trust CA

# Rule Introduction

AnyProxy provides the ability to load your own rules written in javascript. With rule module, you could customize the logic to handle requests.

> Make sure your rule file is got from a trusted source. Otherwise, you may face some unknown security risk.

Rule module could do the following stuff:

- intercept and modify the request which is being sent
  - editable fields include request header, body, target address
- intercept and modify the response from server
  - editable fields include response status code, header, body
- intercept https requests, modify request and response

### sample

- Target

  - write a rule module to append some text to the response of GET http://httpbin.org/user-agent, and delay the response for 5 seconds

- Step 1，Write the rule file, save as sample.js

      // file: sample.js
      module.exports = {
        summary: 'a rule to hack response',
        *beforeSendResponse(requestDetail, responseDetail) {
          if (requestDetail.url === 'http://httpbin.org/user-agent') {
            const newResponse = responseDetail.response;
            newResponse.body += '- AnyProxy Hacked!';

            return new Promise((resolve, reject) => {
              setTimeout(() => { // delay
                resolve({ response: newResponse });
              }, 5000);
            });
          }
        },
      };

- Step 2, start AnyProxy and load the rule file

  - run `anyproxy --rule sample.js`

- Step 3, test

  - use curl

        curl http://httpbin.org/user-agent --proxy http://127.0.0.1:8001

  - use browser. Point the http proxy of browser to 127.0.0.1:8001, then visit http://httpbin.org/user-agent

  - the expected response from proxy is

      {
        "user-agent": "curl/7.43.0"
      }
      - AnyProxy Hacked!

- Step 4, view the request log

  - visit http://127.0.0.1:8002, the request just sent should be listed here

### how does it work

- The flow chart is as follows

- When got an http request, the entire process of proxy server is

  - AnyProxy collects all the quest info, include method, header, body
  - AnyProxy calls `beforeSendRequest` of the rule module. Rule module deal the request, return new request param or response content
  - If `beforeSendRequest` returns the response content, AnyProxy will send the response to client without sending to target server. The process ends here.
  - Send request to target server, collect response
  - Call `beforeSendResponse` of the rule module. Rule module deal the response data
  - Send response to client

- When AnyProxy get https request, it could replace the certificate and decrypt the request data

  - AnyProxy calls `beforeDealHttpsRequest` of the rule module
  - If the function returns `true`, AnyProxy will do the man-in-the-middle attack to it. Otherwise, the request will not be dealed.

### how to load rule module

- use local file

      anyproxy --rule ./rule.js

- use an online rule file

      anyproxy --rule https://sample.com/rule.js

- use an npm module

  - AnyProxy uses `require()` to load rule module. You could either load a local npm module or a global-installed one.

      anyproxy --rule ./myRulePkg/ #local module
      npm i -g myRulePkg && anyproxy --rule myRulePkg #global-installed module

# Rule module interface

A typical rule module is as follows. All the functions are optional, just write the part you are interested in.

    module.exports = {
      // introduction
      summary: 'my customized rule for AnyProxy',
      // intercept before send request to server
      *beforeSendRequest(requestDetail) { /* ... */ },
      // deal response before send to client
      *beforeSendResponse(requestDetail, responseDetail) { /* ... */ },
      // if deal https request
      *beforeDealHttpsRequest(requestDetail) { /* ... */ },
      // error happened when dealing requests
      *onError(requestDetail, error) { /* ... */ },
      // error happened when connect to https server
      *onConnectError(requestDetail, error) { /* ... */ }
    };

> All functions in your rule file, except summary, are all driven by co . They should be yieldable, i.e. return a promise or be a generator function.

### summary

- Introduction of this rule file. AnyProxy will read this field and give some tip to user.

### beforeSendRequest

#### beforeSendRequest(requestDetail)

- Before sending request to server, AnyProxy will call `beforeSendRequest` with param `requestDetail`
- `requestDetail`
  - `protocol` {string} the protocol to use, http or https
  - `requestOptions` {object} the options of the request-to-go, a param of require('http').request . ref: https://nodejs.org/api/http.html#http_http_request_options_callback
  - `requestData` {object} request body
  - `url` {string} request url
  - `_req` {object} the native node.js request object

- e.g. When requesting anyproxy.io, `requestDetail` is something like the following

      {
        protocol: 'http',
        url: 'http://anyproxy.io/',
        requestOptions: {
          hostname: 'anyproxy.io',
          port: 80,
          path: '/',
          method: 'GET',
          headers: {
            Host: 'anyproxy.io',
            'Proxy-Connection': 'keep-alive',
            'User-Agent': '...'
          }
        },
        requestData: '...',
        _req: { /* ... */}
      }

- Any of these return values are valid

  - do nothing, and return null

      return null;

  - modify the request protocol，i.e. force use https

      return {
        protocol: 'https'
      };

  - modify request param

      var newOption = Object.assign({}, requestDetail.requestOptions);
      newOption.path = '/redirect/to/another/path';
      return {
        requestOptions: newOption
      };

  - modify request body

      return {
        requestData: 'my new request data'
        // requestOptions can also be used here
      };

  - give response to the client, not sending request any longer. `statusCode` `headers`are required is this situation.

      return {
        response: {
          statusCode: 200,
          header: { 'content-type': 'text/html' },
          body: 'this could be a <string> or <buffer>'
        }
      };

### beforeSendResponse

#### beforeSendResponse(requestDetail, responseDetail)

- Before sending response to client, AnyProxy will call `beforeSendResponse` with param `requestDetail` `responseDetail`
- `requestDetail` is the same param as in `beforeSendRequest`
- `responseDetail`
  - `response` {object} the response from server, includes `statusCode` `header` `body`
  - `_res` {object} the native node.js response object

- e.g. When requesting anyproxy.io, `responseDetail` is something like the following

      {
        response: {
          statusCode: 200,
          header: {
            'Content-Type': 'image/gif',
            Connection: 'close',
            'Cache-Control': '...'
          },
          body: '...'
        },
        _res: { /* ... */ }
      }

- Any of these return values are valid

  - do nothing, and return null

      return null;

  - modify the response status code

      var newResponse = Object.assign({}, responseDetail.response);
      newResponse.statusCode = 404;
      return {
        response: newResponse
      };

  - modify the response content

      var newResponse = Object.assign({}, responseDetail.response);
      newResponse.body += '--from anyproxy--';
      return {
        response: newResponse
      };

### beforeDealHttpsRequest

#### beforeDealHttpsRequest(requestDetail)

- When receiving https request, AnyProxy will call `beforeDealHttpsRequest` with param `requestDetail`
- If configed with `forceProxyHttps` in launching, AnyProxy will skip calling this method
- Only by returning true, AnyProxy will try to replace the certificate and intercept the https request.
- `requestDetail`
  - `host` {string} the target host to request. Due to the request protocol, full url couldn't be got here
  - `_req` {object} the native node.js request object. The `_req` here refers to the CONNECT request.
- return value
  - `true` or `false`, whether AnyProxy should intercept the https request

### onError

#### onError(requestDetail, error)

- AnyProxy will call this method when an error happened in request handling.
- Errors usually are issued during requesting, e.g. DNS failure, request timeout
- `requestDetail` is the same one as in `beforeSendRequest`

- Any of these return values are valid

  - do nothing, and AnyProxy will response a default error page

      return null;

  - return a customized error page

      return {
        response: {
          statusCode: 200,
          header: { 'content-type': 'text/html' },
          body: 'this could be a <string> or <buffer>'
        }
      };

### onConnectError

#### onConnectError(requestDetail, error)

- AnyProxy will call this method when failed to connect target server in https request
- `requestDetail` is the same one as in `beforeDealHttpsRequest`
- no return value is required

# Rule Samples

- here are some samples about frequently used rule file
- try these samples by `anyproxy --rule http://....js`
- how to test with curl:
  - request the server directly `curl http://httpbin.org/`
  - request the server via proxy `curl http://httpbin.org/ --proxy http://127.0.0.1:8001`

### use local response

- intercept the request towards http://httpbin.org , return the local-defined response

    anyproxy --rule rule_sample/sample_use_local_response.js

    /*
      sample:
        intercept all requests toward httpbin.org, use a local response
      test:
        curl http://httpbin.org/user-agent --proxy http://127.0.0.1:8001
    */
    module.exports = {
      *beforeSendRequest(requestDetail) {
        const localResponse = {
          statusCode: 200,
          header: { 'Content-Type': 'application/json' },
          body: '{"hello": "this is local response"}'
        };
        if (requestDetail.url.indexOf('http://httpbin.org') === 0) {
          return {
            response: localResponse
          };
        }
      },
    };

### modify request header

- modify the user-agent sent to httpbin.org

    anyproxy --rule rule_sample/sample_modify_request_header.js

    /*
      sample:
        modify the user-agent in requests toward httpbin.org
      test:
        curl http://httpbin.org/user-agent --proxy http://127.0.0.1:8001
    */
    module.exports = {
      *beforeSendRequest(requestDetail) {
        if (requestDetail.url.indexOf('http://httpbin.org') === 0) {
          const newRequestOptions = requestDetail.requestOptions;
          newRequestOptions.headers['User-Agent'] = 'AnyProxy/0.0.0';
          return {
            requestOptions: newRequestOptions
          };
        }
      },
    };

### modify request body

- modify the post body of http://httpbin.org/post

    anyproxy --rule rule_sample/sample_modify_request_data.js

    /*
      sample:
        modify the post data towards http://httpbin.org/post
      test:
        curl -H "Content-Type: text/plain" -X POST -d 'original post data' http://httpbin.org/post --proxy http://127.0.0.1:8001
      expected response:
        { "data": "i-am-anyproxy-modified-post-data" }
    */
    module.exports = {
      summary: 'Rule to modify request data',
      *beforeSendRequest(requestDetail) {
        if (requestDetail.url.indexOf('http://httpbin.org/post') === 0) {
          return {
            requestData: 'i-am-anyproxy-modified-post-data'
          };
        }
      },
    };

### modify the request target

- send all the request towards http://httpbin.org/ to http://httpbin.org/user-agent

    anyproxy --rule rule_sample/sample_modify_request_path.js

    /*
      sample:
        redirect all https://httpbin.org/user-agent requests to http://localhost:8008/index.html
      test:
        curl https://httpbin.org/user-agent --proxy http://127.0.0.1:8001
      expected response:
        'hello world' from 127.0.0.1:8001/index.html
    */
    module.exports = {
      *beforeSendRequest(requestDetail) {
        if (requestDetail.url.indexOf('https://httpbin.org/user-agent') === 0) {
          const newRequestOptions = requestDetail.requestOptions;
          requestDetail.protocol = 'http';
          newRequestOptions.hostname = '127.0.0.1'
          newRequestOptions.port = '8008';
          newRequestOptions.path = '/index.html';
          newRequestOptions.method = 'GET';
          return requestDetail;
        }
      },
      *beforeDealHttpsRequest(requestDetail) {
        return true;
      }
    };

### modify request protocol

- modify the http request towards http://httpbin.org to https

    anyproxy --rule rule_sample/sample_modify_request_protocol.js

    /*
      sample:
        redirect all http requests of httpbin.org to https
      test:
        curl 'http://httpbin.org/get?show_env=1' --proxy http://127.0.0.1:8001
      expected response:
        { "X-Forwarded-Protocol": "https" }
    */
    module.exports = {
      *beforeSendRequest(requestDetail) {
        if (requestDetail.url.indexOf('http://httpbin.org') === 0) {
          const newOption = requestDetail.requestOptions;
          newOption.port = 443;
          return {
            protocol: 'https',
            requestOptions: newOption
          };
        }
      }
    };

### modify response status code

- modify all status code from http://httpbin.org to 404

    anyproxy --rule rule_sample/sample_modify_response_statuscode.js

    /*
      sample:
        modify all status code of http://httpbin.org/ to 404
      test:
        curl -I 'http://httpbin.org/user-agent' --proxy http://127.0.0.1:8001
      expected response:
        HTTP/1.1 404 Not Found
    */
    module.exports = {
      *beforeSendResponse(requestDetail, responseDetail) {
        if (requestDetail.url.indexOf('http://httpbin.org') === 0) {
          const newResponse = responseDetail.response;
          newResponse.statusCode = 404;
          return {
            response: newResponse
          };
        }
      }
    };

### modify the response header

- add X-Proxy-By:AnyProxy to the response header from http://httpbin.org/user-agent

    anyproxy --rule rule_sample/sample_modify_response_header.js

    /*
      sample:
        modify response header of http://httpbin.org/user-agent
      test:
        curl -I 'http://httpbin.org/user-agent' --proxy http://127.0.0.1:8001
      expected response:
        X-Proxy-By: AnyProxy
    */
    module.exports = {
      *beforeSendResponse(requestDetail, responseDetail) {
        if (requestDetail.url.indexOf('http://httpbin.org/user-agent') === 0) {
          const newResponse = responseDetail.response;
          newResponse.header['X-Proxy-By'] = 'AnyProxy';
          return {
            response: newResponse
          };
        }
      }
    };

### modify response data and delay

- append some info to the response of http://httpbin.org/user-agent, then delay the response for 5 seconds.

    anyproxy --rule rule_sample/sample_modify_response_data.js

    /*
      sample:
        modify response data of http://httpbin.org/user-agent
      test:
        curl 'http://httpbin.org/user-agent' --proxy http://127.0.0.1:8001
      expected response:
        { "user-agent": "curl/7.43.0" } -- AnyProxy Hacked! --
    */

    module.exports = {
      *beforeSendResponse(requestDetail, responseDetail) {
        if (requestDetail.url === 'http://httpbin.org/user-agent') {
          const newResponse = responseDetail.response;
          newResponse.body += '-- AnyProxy Hacked! --';
          return new Promise((resolve, reject) => {
            setTimeout(() => { // delay the response for 5s
              resolve({ response: newResponse });
            }, 5000);
          });
        }
      },
    };

# Config Certification

### Config root CA in OSX

- this kind of errors is usually caused by untrusted root CA

> Warning: please keep your root CA safe since it may influence your system security.

install ：

- double click rootCA.crt

- add cert into login or system

- find the newly imported AnyProxy certificates, configured as Always Trust

### Config root CA in windows

### Config OSX system proxy

- the config is in wifi - advanced

### config http proxy server

- take Chrome extent [SwitchyOmega] as an example(https://chrome.google.com/webstore/detail/padekgcemlokbadohgkifijomclgjgif)为例

### trust root CA in iOS

- Click Root CA in web ui, and follow the instruction to install

### trust root CA in iOS after 10.3

- Besides installing root CA, you have to "turn on" the certificate for web manually in settings - general - about - Certificate Trust Settings. Otherwire, safari will not trust the root CA generated by AnyProxy.

### trust root CA in Android

First of all, you need to download the root CA by clicking Root CA in web ui, and then scan the QR code. Installing CA in Android could be different based on the system, we list some common steps as below, but you can find the right way in you system with similar menu path.

- The downloaded CA file can be directly installed by clicking, this is the easist way
- You need to install the CA file from other menu, such as:
  - Settings -> Security & Location > Encryption & credentials -> Install from storage, and find your CA file to install
  - Settings -> Security -> Install from SD card, and find you CA file to install

### config iOS/Android proxy server

- proxy settings are placed in wifi setting

- iOS

- Android

# FAQ

### Q: can not deal https request in rule module.

- A: Any of these options could be used to change the way AnyProxy deall https requests
  1. config `--intercept` when luanching AnyProxy via cli, or use `forceProxyHttps` when using as an npm module
  2. place a `beforeDealHttpsRequest` function in your rule file and determine which request to intercept by your own.

### Q: get an error says function is not yieldable

- A: Rule module is driven by co. The functions inside should be yieldable, i.e. return a promise or be a generator function.

### Q: The connection is not private

AnyProxy will propmt this message when the certification of the site you're visiting is not issued by a common known CA. This happens when the certification is self-signed. If you know and trust it, you can ignore the error as below.

- If you run AnyProxy by command line Pass in the option `--ignore-unauthorized-ssl` to ignore the certification errors, please mind that the option will be active for all connections.

      anyproxy -i --ignore-unauthorized-ssl

- If you run AnyProxy by Nodejs Pass in the option `dangerouslyIgnoreUnauthorized:true`, like this:

      const options = {
       ...,
       dangerouslyIgnoreUnauthorized: true
      };

      const anyproxyIns = new AnyProxy.ProxyCore(options);
      anyproxyIns.start();

  This is also a global option, all certification errors will be ignored

- With the help of AnyProxy Rule You can change the request with rule of course. For this scenario, all you need is to pass in an option to Nodejs `Http.rquest`, as we do in AnyProxy. A simple demo below:

      module.exports = {
        *beforeSendRequest(requestDetail) {
          if (requestDetail.url.indexOf('https://the-site-you-know.com') === 0) {
            const newRequestOptions = requestDetail.requestOptions;
            // set rejectUnauthorized as false
            newRequestOptions.rejectUnauthorized = false;
            return {
              requestOptions: newRequestOptions
            };
          }
        },
      };

  And we get a bonous here, AnyProxy will only ignore the errors for the site(s) we want it to!

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