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150 lines
4.0 KiB
150 lines
4.0 KiB
/** Crypto package used for hashing */
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const crypto = require('crypto');
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/**
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* Helper function to generate a hashed password
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* from a given plain text password.
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*
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* This uses 64 bits of entropy as the random salt
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* and uses sha256 hashing method to hash the password
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* combined with the salt.
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*
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* @param password
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* @returns {Object pass: hashedPassword, salt: salt used to hash}
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*/
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const createHashedPasswordObject = function(password)
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{
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const randBuff = crypto.randomBytes(64);
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const salt = crypto.createHash('sha256').update(randBuff).digest('hex');
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const hashPass = hashPassword(password, salt);
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var hashPassObject = new Object();
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hashPassObject.pass = hashPass;
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hashPassObject.salt = salt;
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return hashPassObject;
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};
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/**
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* Hashes a pasword with a aprticular salt
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* using the crypto library
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*
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* @param password
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* @param salt
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*/
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const hashPassword = function(password, salt)
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{
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return crypto.createHash('sha256')
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.update(password + salt)
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.digest('hex');
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};
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/**
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* Fetches the index of the user in the configuration. If the
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* user does not exists a -1 is returned.
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*/
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const getIndexOfUser = function(username, configuration)
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{
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for(var i = 0; i < configuration.users.length; i++)
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{
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if (username === configuration.users[i].username)
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{
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if(username === configuration.users[i].username)
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{
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return i;
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}
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}
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}
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return -1;
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};
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module.exports =
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{
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/**
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* Checks to see if there was a valid login attempt
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*
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* @param username
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* @param password
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* @param configuration
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* @returns {boolean}
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*/
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checkLogin: function(username, password, configuration)
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{
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const userIndex = getIndexOfUser(username, configuration);
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if(userIndex === -1)
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return false;
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const hashedPassword = hashPassword(password, configuration.users[userIndex].salt);
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return configuration.users[userIndex].password == hashedPassword;
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},
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/**
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* Adds a user to the configuration
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*
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* @param username
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* @param password
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* @param configuration
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* @returns {boolean}
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*/
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addUser: function(username, password, configuration)
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{
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const userIndex = getIndexOfUser(username, configuration);
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if(userIndex !== -1)
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return false; // user already exists
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var newUser = new Object();
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newUser.username = username;
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if(configuration.users.length === 0)
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newUser.id = 1;
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else
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newUser.id = configuration.users[configuration.users.length -1].id + 1;
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const passObject = createHashedPasswordObject(password);
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newUser.salt = passObject.salt;
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newUser.password = passObject.pass;
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configuration.push(newUser);
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return true;
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},
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/**
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* Edits a user based on their id
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*
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* @param id
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* @param userName
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* @param password
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* @param configuration
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*/
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editUser: function(id, userName, password, configuration)
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{
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for(var i = 0; i < configuration.users.length; i++)
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{
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if (configuration.users[i].id + "" === id)
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{
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configuration.users[i].username = userName;
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var passObj = createHashedPasswordObject(password);
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configuration.users[i].salt = passObj.salt;
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configuration.users[i].password = passObj.pass;
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}
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}
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},
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/**
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* Removes a user account from the configuration
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* @param id
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* @param configuration
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*/
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removeUser: function(id, configuration)
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{
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configuration.users = configuration.users.filter(function(value, index, arr)
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{
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return value.id + "" !== id
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});
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}
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};
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