pwdmngr

A simple password management tool written in C that uses SQLite for data storage. Developed for Linux systems as a learning project.

Features

• User registration and login system with credential validation
• Password generation with customizable options:
  • Configurable password length
  • Character type selection
• Account management:
  • Save new accounts
  • Edit existing accounts
  • Delete accounts
  • List all stored accounts
• Option to use generated passwords or custom ones
• Memory leak detection through Valgrind integration

Project Structure

The application includes the following files:

Source Files	Header Files	Description
main.c	-	Main program entry point, handles database connection and option selection
application.c	application.h	Functions for handling user-selected options
database.c	database.h	Database manipulation functions
helper.c	helper.h	Utility functions for user input, memory management, and password hashing
user.c	user.h	User information data structure and operations
account.c	account.h	Account information data structure and operations

Additional files:

• database.sql: SQL schema for database creation
• Makefile: Builds the project

Error Handling

• Provides clear notifications for login errors, specifying which credential is incorrect
• Attempting to use an ungenerated password will notify the user and cancel changes
• Trying to edit a non-existent account will show a warning
• Deleting a non-existent account fails silently
• Memory is managed properly in all edge cases

Requirements & Installation

1. Install required dependencies:

   • gcc, make
   • openssl (check for openssl/evp.h)
   • sqlite3, libsqlite3-dev

2. Initialize the database:

   sqlite3 pwdmngr.db < database.sql

   Alternatively:

   sqlite3 pwdmngr.db
   .read database.sql
   .exit

3. Build and run the application:

   make
   ./main

4. (Optional) Run with Valgrind for memory leak detection:

   valgrind --leak-check=full --show-leak-kinds=all --track-origins=yes --verbose --log-file=valgrind.txt ./main -lsqlite3

   Results will be available in valgrind.txt after exiting the application.