Initial upload.

.gitignore

@@ -0,0 +1,133 @@
+# Byte-compiled / optimized / DLL files
+__pycache__/
+*.py[cod]
+*$py.class
+
+# C extensions
+*.so
+
+# Distribution / packaging
+.Python
+build/
+develop-eggs/
+dist/
+downloads/
+eggs/
+.eggs/
+lib/
+lib64/
+parts/
+sdist/
+var/
+wheels/
+pip-wheel-metadata/
+share/python-wheels/
+*.egg-info/
+.installed.cfg
+*.egg
+MANIFEST
+
+# PyInstaller
+#  Usually these files are written by a python script from a template
+#  before PyInstaller builds the exe, so as to inject date/other infos into it.
+*.manifest
+*.spec
+
+# Installer logs
+pip-log.txt
+pip-delete-this-directory.txt
+
+# Unit test / coverage reports
+htmlcov/
+.tox/
+.nox/
+.coverage
+.coverage.*
+.cache
+nosetests.xml
+coverage.xml
+*.cover
+*.py,cover
+.hypothesis/
+.pytest_cache/
+
+# Translations
+*.mo
+*.pot
+
+# Django stuff:
+*.log
+local_settings.py
+db.sqlite3
+db.sqlite3-journal
+
+# Flask stuff:
+instance/
+.webassets-cache
+
+# Scrapy stuff:
+.scrapy
+
+# Sphinx documentation
+docs/_build/
+
+# PyBuilder
+target/
+
+# Jupyter Notebook
+.ipynb_checkpoints
+
+# IPython
+profile_default/
+ipython_config.py
+
+# pyenv
+.python-version
+
+# pipenv
+#   According to pypa/pipenv#598, it is recommended to include Pipfile.lock in version control.
+#   However, in case of collaboration, if having platform-specific dependencies or dependencies
+#   having no cross-platform support, pipenv may install dependencies that don't work, or not
+#   install all needed dependencies.
+#Pipfile.lock
+
+# PEP 582; used by e.g. github.com/David-OConnor/pyflow
+__pypackages__/
+
+# Celery stuff
+celerybeat-schedule
+celerybeat.pid
+
+# SageMath parsed files
+*.sage.py
+
+# Environments
+.env
+.venv
+env/
+venv/
+ENV/
+env.bak/
+venv.bak/
+
+# Spyder project settings
+.spyderproject
+.spyproject
+
+# Rope project settings
+.ropeproject
+
+# mkdocs documentation
+/site
+
+# mypy
+.mypy_cache/
+.dmypy.json
+dmypy.json
+
+# Pyre type checker
+.pyre/
+
+# dumper
+license_request.bin
+key_dumps

Helpers/Device.py

@@ -0,0 +1,88 @@
+import os
+import logging
+import base64
+import frida
+from Crypto.PublicKey import RSA
+from Helpers.wv_proto2_pb2 import SignedLicenseRequest
+
+
+class Device:
+    def __init__(self):
+        self.logger = logging.getLogger(__name__)
+        self.saved_keys = {}
+        self.frida_script = open(
+            './Helpers/script.js',
+            'r',
+            encoding="utf_8"
+        ).read()
+        self.widevine_libraries = [
+            'libwvhidl.so'
+        ]
+        self.usb_device = frida.get_usb_device()
+        self.name = self.usb_device.name
+
+    def export_key(self, key, client_id):
+        save_dir = os.path.join(
+            'key_dumps',
+            f'{self.name}',
+            'private_keys',
+            f'{client_id.Token._DeviceCertificate.SystemId}',
+            f'{str(key.n)[:10]}'
+        )
+
+        if not os.path.exists(save_dir):
+            os.makedirs(save_dir)
+
+        with open(os.path.join(save_dir, 'client_id.bin'), 'wb+') as writer:
+            writer.write(client_id.SerializeToString())
+
+        with open(os.path.join(save_dir, 'private_key.pem'), 'wb+') as writer:
+            writer.write(key.exportKey('PEM'))
+        self.logger.info('Key pairs saved at %s', save_dir)
+
+    def on_message(self, msg, data):
+        if 'payload' in msg:
+            if msg['payload'] == 'private_key':
+                key = RSA.import_key(data)
+                if key.n not in self.saved_keys:
+                    self.logger.debug(
+                        'Retrieved key: \n\n%s\n',
+                        key.export_key().decode("utf-8")
+                    )
+                self.saved_keys[key.n] = key
+            elif msg['payload'] == 'device_info':
+                self.license_request_message(data)
+            elif msg['payload'] == 'message_info':
+                self.logger.info(data.decode())
+
+    def license_request_message(self, data):
+        self.logger.debug(
+            'Retrieved build info: \n\n%s\n',
+            base64.b64encode(data).decode('utf-8')
+        )
+        root = SignedLicenseRequest()
+        root.ParseFromString(data)
+        public_key = root.Msg.ClientId.Token._DeviceCertificate.PublicKey
+        key = RSA.importKey(public_key)
+        cur = self.saved_keys.get(key.n)
+        self.export_key(cur, root.Msg.ClientId)
+
+    def find_widevine_process(self, process_name):
+        process = self.usb_device.attach(process_name)
+        script = process.create_script(self.frida_script)
+        script.load()
+        loaded_modules = []
+        try:
+            for lib in self.widevine_libraries:
+                loaded_modules.append(script.exports.getmodulebyname(lib))
+        finally:
+            process.detach()
+            return loaded_modules
+
+    def hook_to_process(self, process, library):
+        session = self.usb_device.attach(process)
+        script = session.create_script(self.frida_script)
+        script.on('message', self.on_message)
+        script.load()
+        script.exports.hooklibfunctions(library)
+        return session

Helpers/script.js

@@ -0,0 +1,156 @@
+const CDM_VERSION = ''
+
+// The TextEncoder/Decoder API isn't supported so it has to be polyfilled.
+// Taken from https://gist.github.com/Yaffle/5458286#file-textencodertextdecoder-js
+function TextEncoder() {
+}
+
+TextEncoder.prototype.encode = function (string) {
+    var octets = [];
+    var length = string.length;
+    var i = 0;
+    while (i < length) {
+        var codePoint = string.codePointAt(i);
+        var c = 0;
+        var bits = 0;
+        if (codePoint <= 0x0000007F) {
+            c = 0;
+            bits = 0x00;
+        } else if (codePoint <= 0x000007FF) {
+            c = 6;
+            bits = 0xC0;
+        } else if (codePoint <= 0x0000FFFF) {
+            c = 12;
+            bits = 0xE0;
+        } else if (codePoint <= 0x001FFFFF) {
+            c = 18;
+            bits = 0xF0;
+        }
+        octets.push(bits | (codePoint >> c));
+        c -= 6;
+        while (c >= 0) {
+            octets.push(0x80 | ((codePoint >> c) & 0x3F));
+            c -= 6;
+        }
+        i += codePoint >= 0x10000 ? 2 : 1;
+    }
+    return octets;
+}
+
+function getPrivateKey(address) {
+    Interceptor.attach(ptr(address), {
+        onEnter: function (args) {
+            if (!args[6].isNull()) {
+                const size = args[6].toInt32();
+                if (size >= 1000 && size <= 2000 && !args[5].isNull()) {
+                    const buf = args[5].readByteArray(size);
+                    const bytes = new Uint8Array(buf);
+                    // The first two bytes of the DER encoding are 0x30 and 0x82 (MII).
+                    if (bytes[0] === 0x30 && bytes[1] === 0x82) {
+                        try {
+                            const binaryString = a2bs(bytes)
+                            const keyLength = getKeyLength(binaryString);
+                            const key = bytes.slice(0, keyLength);
+                            send('private_key', key);
+                        } catch (error) {
+                            console.log(error)
+                        }
+                    }
+                }
+            }
+        }
+    });
+}
+
+// nop privacy mode.
+// PrivacyMode encrypts the payload with the public key returned by the license server which we don't want.
+function disablePrivacyMode(address) {
+    Interceptor.attach(address, {
+        onLeave: function (retval) {
+            retval.replace(ptr(0));
+        }
+    });
+}
+
+function prepareKeyRequest(address) {
+    Interceptor.attach(ptr(address), {
+        onEnter: function (args) {
+            switch (CDM_VERSION) {
+                case '14.0.0':
+                case '15.0.0':
+                case '16.0.0':
+                    this.ret = args[4];
+                    break;
+                case '16.1.0':
+                    this.ret = args[5];
+                    break;
+                default:
+                    this.ret = args[4];
+                    break;
+            }
+        },
+        onLeave: function () {
+            if (this.ret) {
+                const size = Memory.readU32(ptr(this.ret).add(Process.pointerSize))
+                const arr = Memory.readByteArray(this.ret.add(Process.pointerSize * 2).readPointer(), size)
+                send('device_info', arr);
+            }
+        }
+    });
+}
+
+function hookLibFunctions(lib) {
+    const name = lib['name'];
+    const baseAddr = lib['base'];
+    const message = 'Hooking ' + name + ' at ' + baseAddr;
+
+    send('message_info', new TextEncoder().encode(message))
+
+    Module.enumerateExportsSync(name).forEach(function (module) {
+        try {
+            let hookedModule;
+            if (module.name.includes('UsePrivacyMode')) {
+                disablePrivacyMode(module.address);
+                hookedModule = module.name
+            } else if (module.name.includes('PrepareKeyRequest')) {
+                prepareKeyRequest(module.address);
+                hookedModule = module.name
+            } else if (module.name.match(/^[a-z]+$/)) {
+                getPrivateKey(module.address);
+                hookedModule = module.name
+            }
+
+            if (hookedModule) {
+                const message = 'Hooked ' + hookedModule + ' at ' + module.address;
+                send('message_info', new TextEncoder().encode(message));
+            }
+        } catch (e) {
+            console.log("Error: " + e + " at F: " + module.name);
+        }
+    });
+}
+
+function getModuleByName(lib) {
+    return Process.getModuleByName(lib);
+}
+
+function a2bs(bytes) {
+    let b = '';
+    for (let i = 0; i < bytes.byteLength; i++)
+        b += String.fromCharCode(bytes[i]);
+    return b
+}
+
+function getKeyLength(key) {
+    let pos = 1 // Skip the tag
+    let buf = key.charCodeAt(pos++);
+    let len = buf & 0x7F; // Short tag length
+
+    buf = 0;
+    for (let i = 0; i < len; ++i)
+        buf = (buf * 256) + key.charCodeAt(pos++);
+    return pos + Math.abs(buf);
+}
+
+rpc.exports.hooklibfunctions = hookLibFunctions;
+rpc.exports.getmodulebyname = getModuleByName;

README.md

@@ -1,92 +1,36 @@
-# DumperV2
+# Dumper
 
+Dumper is a Frida script to dump L3 CDMs from any Android device.
 
+## ** IMPORTANT **
+The function parameters can differ between CDM versions. The default is [4] but you may have to change this for your specific version.
 
-## Getting started
+* `CDM_VERSION` can be retrieved using a DRM Info app.
 
-To make it easy for you to get started with GitLab, here's a list of recommended next steps.
+## Requirements
+Use pip to install the dependencies:
 
-Already a pro? Just edit this README.md and make it your own. Want to make it easy? [Use the template at the bottom](#editing-this-readme)!
+`pip3 install -r requirements.txt`
-
-## Add your files
-
-- [ ] [Create](https://docs.gitlab.com/ee/user/project/repository/web_editor.html#create-a-file) or [upload](https://docs.gitlab.com/ee/user/project/repository/web_editor.html#upload-a-file) files
-- [ ] [Add files using the command line](https://docs.gitlab.com/ee/gitlab-basics/add-file.html#add-a-file-using-the-command-line) or push an existing Git repository with the following command:
-
-```
-cd existing_repo
-git remote add origin https://CDM-Project.com/cdm-tools/dumperv2.git
-git branch -M main
-git push -uf origin main
-```
-
-## Integrate with your tools
-
-- [ ] [Set up project integrations](https://CDM-Project.com/cdm-tools/dumperv2/-/settings/integrations)
-
-## Collaborate with your team
-
-- [ ] [Invite team members and collaborators](https://docs.gitlab.com/ee/user/project/members/)
-- [ ] [Create a new merge request](https://docs.gitlab.com/ee/user/project/merge_requests/creating_merge_requests.html)
-- [ ] [Automatically close issues from merge requests](https://docs.gitlab.com/ee/user/project/issues/managing_issues.html#closing-issues-automatically)
-- [ ] [Enable merge request approvals](https://docs.gitlab.com/ee/user/project/merge_requests/approvals/)
-- [ ] [Automatically merge when pipeline succeeds](https://docs.gitlab.com/ee/user/project/merge_requests/merge_when_pipeline_succeeds.html)
-
-## Test and Deploy
-
-Use the built-in continuous integration in GitLab.
-
-- [ ] [Get started with GitLab CI/CD](https://docs.gitlab.com/ee/ci/quick_start/index.html)
-- [ ] [Analyze your code for known vulnerabilities with Static Application Security Testing(SAST)](https://docs.gitlab.com/ee/user/application_security/sast/)
-- [ ] [Deploy to Kubernetes, Amazon EC2, or Amazon ECS using Auto Deploy](https://docs.gitlab.com/ee/topics/autodevops/requirements.html)
-- [ ] [Use pull-based deployments for improved Kubernetes management](https://docs.gitlab.com/ee/user/clusters/agent/)
-- [ ] [Set up protected environments](https://docs.gitlab.com/ee/ci/environments/protected_environments.html)
-
-***
-
-# Editing this README
-
-When you're ready to make this README your own, just edit this file and use the handy template below (or feel free to structure it however you want - this is just a starting point!). Thank you to [makeareadme.com](https://www.makeareadme.com/) for this template.
-
-## Suggestions for a good README
-Every project is different, so consider which of these sections apply to yours. The sections used in the template are suggestions for most open source projects. Also keep in mind that while a README can be too long and detailed, too long is better than too short. If you think your README is too long, consider utilizing another form of documentation rather than cutting out information.
-
-## Name
-Choose a self-explaining name for your project.
-
-## Description
-Let people know what your project can do specifically. Provide context and add a link to any reference visitors might be unfamiliar with. A list of Features or a Background subsection can also be added here. If there are alternatives to your project, this is a good place to list differentiating factors.
-
-## Badges
-On some READMEs, you may see small images that convey metadata, such as whether or not all the tests are passing for the project. You can use Shields to add some to your README. Many services also have instructions for adding a badge.
-
-## Visuals
-Depending on what you are making, it can be a good idea to include screenshots or even a video (you'll frequently see GIFs rather than actual videos). Tools like ttygif can help, but check out Asciinema for a more sophisticated method.
-
-## Installation
-Within a particular ecosystem, there may be a common way of installing things, such as using Yarn, NuGet, or Homebrew. However, consider the possibility that whoever is reading your README is a novice and would like more guidance. Listing specific steps helps remove ambiguity and gets people to using your project as quickly as possible. If it only runs in a specific context like a particular programming language version or operating system or has dependencies that have to be installed manually, also add a Requirements subsection.
 
 ## Usage
-Use examples liberally, and show the expected output if you can. It's helpful to have inline the smallest example of usage that you can demonstrate, while providing links to more sophisticated examples if they are too long to reasonably include in the README.
 
-## Support
+* Enable USB debugging
-Tell people where they can go to for help. It can be any combination of an issue tracker, a chat room, an email address, etc.
+* Start frida-server on the device
+* Execute dump_keys.py
+* Start streaming some DRM-protected content
 
-## Roadmap
+## Known Working Versions
-If you have ideas for releases in the future, it is a good idea to list them in the README.
+* Android 9
+    * CDM 14.0.0
+* Android 10
+    * CDM 15.0.0
+* Android 11
+    * CDM 16.0.0
+* Android 12
+    * CDM 16.1.0
 
-## Contributing
+## Temporary disabling L1 to use L3 instead
-State if you are open to contributions and what your requirements are for accepting them.
+A few phone brands let us use the L1 keybox even after unlocking the bootloader (like Xiaomi). In this case, installation of a Magisk module called [liboemcrypto-disabler](https://github.com/umylive/liboemcrypto-disabler) is necessary.
 
-For people who want to make changes to your project, it's helpful to have some documentation on how to get started. Perhaps there is a script that they should run or some environment variables that they need to set. Make these steps explicit. These instructions could also be useful to your future self.
+## Credits
-
+Thanks to the original author of the code.
-You can also document commands to lint the code or run tests. These steps help to ensure high code quality and reduce the likelihood that the changes inadvertently break something. Having instructions for running tests is especially helpful if it requires external setup, such as starting a Selenium server for testing in a browser.
-
-## Authors and acknowledgment
-Show your appreciation to those who have contributed to the project.
-
-## License
-For open source projects, say how it is licensed.
-
-## Project status
-If you have run out of energy or time for your project, put a note at the top of the README saying that development has slowed down or stopped completely. Someone may choose to fork your project or volunteer to step in as a maintainer or owner, allowing your project to keep going. You can also make an explicit request for maintainers.

dump_keys.py

@@ -0,0 +1,30 @@
+#!/usr/bin/env python3
+
+import time
+import logging
+from Helpers.Device import Device
+
+logging.basicConfig(
+    format='%(asctime)s - %(name)s - %(lineno)d - %(levelname)s - %(message)s',
+    datefmt='%Y-%m-%d %I:%M:%S %p',
+    level=logging.DEBUG,
+)
+
+
+def main():
+    logger = logging.getLogger("main")
+    device = Device()
+    logger.info('Connected to %s', device.name)
+    logger.info('Scanning all processes')
+
+    for process in device.usb_device.enumerate_processes():
+        if 'drm' in process.name:
+            for library in device.find_widevine_process(process.name):
+                device.hook_to_process(process.name, library)
+    logger.info('Functions Hooked, load the DRM stream test on Bitmovin!')
+
+
+if __name__ == '__main__':
+    main()
+    while True:
+        time.sleep(1000)

requirements.txt

@@ -0,0 +1,3 @@
+frida
+protobuf == 3.19.3
+pycryptodome