Could Not Store Password An Apparmor Policy

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As a developer, safeguarding sensitive data like passwords is crucial in creating a secure application. However, I faced a difficulty when attempting to securely store passwords in an AppArmor policy integrated application. In this article, I will recount my own experience and explain the reasons behind this issue and how I managed to resolve it.

Understanding AppArmor Policies

Before diving into the problem, it’s essential to have a basic understanding of AppArmor. AppArmor is a Linux kernel security module that restricts the capabilities of individual programs. It uses security profiles, known as AppArmor policies, to define what actions a program can or cannot perform.

AppArmor provides an additional layer of security by confining programs to a predefined set of actions, preventing any unauthorized access or potentially harmful operations. However, this can sometimes lead to issues when trying to perform certain actions, like storing passwords securely.

The Problem: Storing Passwords

When I attempted to store passwords in my application that had AppArmor policies in place, I encountered an error. The AppArmor policy was blocking the application from accessing the file or database where the passwords were supposed to be stored. This was a critical issue as it meant that the application was unable to securely store user passwords and could potentially lead to a breach of sensitive information.

Investigating the Issue

I began investigating the issue by examining the AppArmor policy that was in effect for my application. The policy contained various rules and restrictions to ensure the security of the application, but it seemed that these policies were inadvertently blocking the necessary file access for storing passwords.

After analyzing the policy, I discovered that the specific rule responsible for blocking the password storage was related to the file system permissions. The policy was restricting write access to the directory where the password file was located, effectively preventing the application from creating or modifying the file.

Resolving the Issue

To resolve the issue, I needed to modify the AppArmor policy to allow the application to write to the password file. This required careful consideration to ensure that the modification did not compromise the security of the application.

I began by identifying the specific rule in the policy that was causing the restriction. Then, I adjusted the rule to allow the necessary write access to the password file while maintaining the overall security of the application.

After modifying the policy, I tested the application again, and this time I was able to successfully store the passwords without any errors or restrictions imposed by the AppArmor policy.


In conclusion, encountering difficulties while trying to store passwords in an application with AppArmor policies is not uncommon. However, with proper investigation and understanding of the policies in place, it is possible to overcome these challenges without compromising the security of the application.

By modifying the AppArmor policy to allow the necessary file access, developers can ensure that passwords are securely stored, providing a crucial layer of protection for user data. It is essential to strike a balance between security and functionality to create a robust and secure application.