Need

Enforcement of a strong password policy, covering password expiration, complexity requirements, and secure temporary password handling

Context

Description

# --- Password Expiration ---
import com.amazonaws.services.identitymanagement.AmazonIdentityManagement
import com.amazonaws.services.identitymanagement.model.UpdateAccountPasswordPolicyRequest

val iam: AmazonIdentityManagement = ???

val request = new UpdateAccountPasswordPolicyRequest()
  .withMaxPasswordAge(0) // Passwords never expire...

**Password Expiration:** The code above is a Scala code snippet that uses the AWS SDK to set the IAM password policy. The `UpdateAccountPasswordPolicyRequest` object is used to define the policy changes. The method `withMaxPasswordAge` is used to set the maximum password age in days. In this case, it is set to 0, which means that the passwords never expire. This represents a security vulnerability because it means that users are not required to change their passwords regularly. If an attacker is able to obtain a user's password, they will have indefinite access to the user's account. **Password strength:** The above Scala code represents a form mapping for user data in a Play framework application. The form accepts two fields, `name` and `password`, both of which are of type `text`. This form is used to capture user registration data, specifically the username and the password. The vulnerability here lies in the handling of the `password` field. There is no password strength policy in place. The code accepts any string input as a password, which is a security risk. A weak password policy makes the system susceptible to brute force or dictionary attacks. If the password policy does not enforce the use of a mix of upper and lower case letters, numbers, and special characters, or a minimum length for the password, it becomes easier for attackers to guess the password using common words or simple combinations. In the current state, the system does not enforce any password complexity rules, making it a potential target for unauthorized access. **Temporary passwords:** The above Scala code represents a simple Play Framework controller that generates a temporary password for a user. The `generateTempPassword` function generates a random UUID and then takes the first 5 characters to create a temporary password. The vulnerability here is that the temporary password generated is not strong enough. It only uses 5 alphanumeric characters, which means it can be easily cracked by brute force attacks. The UUID generation also does not take into consideration the need for a mixture of uppercase, lowercase, numbers, and special characters, which further weakens the security of the temporary password. In addition, the temporary password is returned directly in the HTTP response, which could be intercepted and read by an attacker if the connection is not secure.

# --- Password Expiration ---
import com.amazonaws.services.identitymanagement.AmazonIdentityManagement
import com.amazonaws.services.identitymanagement.model.UpdateAccountPasswordPolicyRequest

val iam: AmazonIdentityManagement = ???

val request = new UpdateAccountPasswordPolicyRequest()
  .withMaxPasswordAge(90) // Passwords expire after 90 days...

**Password Expiration:** The updated code sets the maximum password age to 90 days. This means that IAM user passwords will expire after 90 days, and users will be required to change their passwords. The `UpdateAccountPasswordPolicyRequest` method is used to update the password policy for the AWS account. The `withMaxPasswordAge` method is used to set the maximum password age for the policy. By setting the maximum password age to 90 days, we ensure that passwords are not used indefinitely, reducing the risk of password-related security breaches. This is a good security practice as it ensures that old potentially compromised passwords are not used indefinitely. The `iam.updateAccountPasswordPolicy(request)` line sends the request to update the password policy. Please note that after this change, users will be prompted to change their passwords when they expire after 90 days. It's important to communicate this change to your users and provide them with instructions on how to change their passwords. **Password strength:** The updated code includes a password policy that enforces minimum length, complexity, and expiration. The password policy is implemented using a custom constraint `passwordCheckConstraint` that checks the following conditions: - The password length must be at least 8 characters. - The password must contain at least one uppercase letter. - The password must contain at least one lowercase letter. - The password must contain at least one digit. - The password must contain at least one special character. The `verifying` method is used to apply the `passwordCheckConstraint` to the password field in the form mapping. If the password does not meet the requirements, the form submission will fail with an appropriate error message. Please note that this code only checks the password strength on the server-side. It is also recommended to implement password strength validation on the client-side to provide immediate feedback to the user. In addition to the password policy, consider using a secure password hashing algorithm, such as bcrypt, to store passwords in the database. This will ensure that even if the database is compromised, the attacker will not be able to use the hashed passwords. Finally, consider implementing multi-factor authentication to add an extra layer of security, and educate users about the importance of choosing strong passwords and regularly updating them. **Temporary passwords:** The previous code was generating temporary passwords using UUID and taking a substring of it, which is not secure enough. The new code generates a secure temporary password using `SecureRandom` and `Base64` encoding. Here's a breakdown of the changes: - A `SecureRandom` instance is created. This provides a cryptographically strong random number generator. - The `generateTempPassword` method now calls a new private method `generateSecurePassword`. - The `generateSecurePassword` method generates a byte array of length 24, fills it with random bytes from `secureRandom`, and then encodes it to a string using URL-safe Base64 encoding. This results in a 32-character string that includes a mix of uppercase and lowercase letters and numbers, and is very unlikely to be guessed. This is a significant improvement over the previous password generation method, but it's still important to enforce a strong password policy. This includes requiring users to change their temporary password after first use, and regularly updating the password policy to adapt to evolving security threats.

References