Android secure coding

Feb 2, 2016Download as PPT, PDF2 likes1,286 views

The document discusses various secure coding practices for Android applications. It covers secure ways to handle local storage such as encrypting data before storing and not decrypting at the client side. It also discusses securing secrets with AES encryption and not relying on shared storage. The document provides code samples for sending encrypted data in JSON, verifying SSL certificates, disabling copy/paste and screenshots. It suggests using ProGuard to protect against decompiling code and analyzing code for vulnerabilities.

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Secure Coding For Android
Applications

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Local Storage - Example
• Remember me option – NOT SECURE WAY

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Token stored
• On local file – NOT SECURE WAY

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Shared Preferences
• SHARED PREFERENCE – NOT SECURE WAY

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Writing to file
• When opening file for writing, make sure to
open it in private mode as shown below –
String FILENAME = “temp";
String string = “token”;
FileOutputStream fos = openFileOutput(FILENAME,
Context.MODE_PRIVATE);
fos.write(string.getBytes());
fos.close();

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Local Storage – Secure Method
• Encrypt the data using strong encryption,
possibly AES
• Do not decrypt the data at client side
• Send Encrypted Data to the server
• Server decrypts the data before validating it

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Securing Secrets
• AES encryption to store secret information
and making secure storage.
• APIs and Libs for it.
• Random cookies and keys.
• Not to open and shared storage.
• Cache and File writing is not enough.
• Design level strategy for it.

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Secure Method – Sample Code

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Sending Encrypted in JSON

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Cache with WebView
• By default, webView control caches all
request and response
• Some of the filenames are –
– webviewCache.db
– webview.db-shm
– webview.db-wal
– webviewCookiesChromium.db
– webviewCookiesChromiumPrivate.db
– imagecache.db

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Sample code to clear the cache

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SSL Implementation
• Application sends request to server over SSL
(Secure Way)
• Most application fails to handle SSL certificate
validation error on the client side
• Only certificate from the OWNER server and
sub-domain should be allowed

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Verify SSL Server – Sample Code

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Copy/Paste in the text fields
• Services are shared between all the
applications
• Attacker can write malicious program to
monitor clipboard to get access to sensitive
data if copy/paste is not disabled
• Copy/Paste must be disabled on the sensitive
fields

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Screenshot in temporary files
• Pressing HOME button takes screenshot of the
last screen and saves it in local storage
• To disable this, manifest file needs to be
updated under Activity Tag

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Protecting IP
• Unlike iOS, there is no encryption supported
by android platform
• Possible to Decompile binary and get access to
source code
• “ProGuard” can be leveraged to protect
against Decompile

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Code Analysis with AppCodeScan
• Semi automated tool
• Ability to expand with custom rules
• Simple tracing utility to verify and track
vulnerabilities
• Simple HTML reporting which can be
converted to PDF

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How Valletta helped healthcare SaaS to transform QA and compliance to grow wi...Egor Kaleynik

This case study explores how we partnered with a mid-sized U.S. healthcare SaaS provider to help them scale from a successful pilot phase to supporting over 10,000 users—while meeting strict HIPAA compliance requirements. Faced with slow, manual testing cycles, frequent regression bugs, and looming audit risks, their growth was at risk. Their existing QA processes couldn’t keep up with the complexity of real-time biometric data handling, and earlier automation attempts had failed due to unreliable tools and fragmented workflows. We stepped in to deliver a full QA and DevOps transformation. Our team replaced their fragile legacy tests with Testim’s self-healing automation, integrated Postman and OWASP ZAP into Jenkins pipelines for continuous API and security validation, and leveraged AWS Device Farm for real-device, region-specific compliance testing. Custom deployment scripts gave them control over rollouts without relying on heavy CI/CD infrastructure. The result? Test cycle times were reduced from 3 days to just 8 hours, regression bugs dropped by 40%, and they passed their first HIPAA audit without issue—unlocking faster contract signings and enabling them to expand confidently. More than just a technical upgrade, this project embedded compliance into every phase of development, proving that SaaS providers in regulated industries can scale fast and stay secure.

TestMigrationsInPy: A Dataset of Test Migrations from Unittest to Pytest (MSR...Andre Hora

Unittest and pytest are the most popular testing frameworks in Python. Overall, pytest provides some advantages, including simpler assertion, reuse of fixtures, and interoperability. Due to such benefits, multiple projects in the Python ecosystem have migrated from unittest to pytest. To facilitate the migration, pytest can also run unittest tests, thus, the migration can happen gradually over time. However, the migration can be timeconsuming and take a long time to conclude. In this context, projects would benefit from automated solutions to support the migration process. In this paper, we propose TestMigrationsInPy, a dataset of test migrations from unittest to pytest. TestMigrationsInPy contains 923 real-world migrations performed by developers. Future research proposing novel solutions to migrate frameworks in Python can rely on TestMigrationsInPy as a ground truth. Moreover, as TestMigrationsInPy includes information about the migration type (e.g., changes in assertions or fixtures), our dataset enables novel solutions to be verified effectively, for instance, from simpler assertion migrations to more complex fixture migrations. TestMigrationsInPy is publicly available at: https://github.com/altinoalvesjunior/TestMigrationsInPy.

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Android secure coding

5. © Blueinfy Solutions Writing to file • When opening file for writing, make sure to open it in private mode as shown below – String FILENAME = “temp"; String string = “token”; FileOutputStream fos = openFileOutput(FILENAME, Context.MODE_PRIVATE); fos.write(string.getBytes()); fos.close();

6. © Blueinfy Solutions Local Storage – Secure Method • Encrypt the data using strong encryption, possibly AES • Do not decrypt the data at client side • Send Encrypted Data to the server • Server decrypts the data before validating it

7. © Blueinfy Solutions Securing Secrets • AES encryption to store secret information and making secure storage. • APIs and Libs for it. • Random cookies and keys. • Not to open and shared storage. • Cache and File writing is not enough. • Design level strategy for it.

11. © Blueinfy Solutions Cache with WebView • By default, webView control caches all request and response • Some of the filenames are – – webviewCache.db – webview.db-shm – webview.db-wal – webviewCookiesChromium.db – webviewCookiesChromiumPrivate.db – imagecache.db

13. © Blueinfy Solutions SSL Implementation • Application sends request to server over SSL (Secure Way) • Most application fails to handle SSL certificate validation error on the client side • Only certificate from the OWNER server and sub-domain should be allowed

15. © Blueinfy Solutions Copy/Paste in the text fields • Services are shared between all the applications • Attacker can write malicious program to monitor clipboard to get access to sensitive data if copy/paste is not disabled • Copy/Paste must be disabled on the sensitive fields

16. © Blueinfy Solutions Screenshot in temporary files • Pressing HOME button takes screenshot of the last screen and saves it in local storage • To disable this, manifest file needs to be updated under Activity Tag

17. © Blueinfy Solutions Protecting IP • Unlike iOS, there is no encryption supported by android platform • Possible to Decompile binary and get access to source code • “ProGuard” can be leveraged to protect against Decompile

18. © Blueinfy Solutions Code Analysis with AppCodeScan • Semi automated tool • Ability to expand with custom rules • Simple tracing utility to verify and track vulnerabilities • Simple HTML reporting which can be converted to PDF

Android secure coding

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