![]() ![]() The reset password token is obtained from the password reset link’s query params. Once they enter the new password, the reset token and the new password are sent to the back-end. The new password is submitted along with the token to the back-end The password validators should follow the same rules as that in a sign up form. Once the user has received the email, they will click on the link and it will redirect them to a page on the website to enter their new password. This means that if a user requests multiple tokens at the same time, we cannot send them the same previously generated token (which is not yet redeemed), since it’s stored in hashed form.Īt the end, we want to generate a password reset link which points to a link on your website that displays the “enter new password” form, and also contains the token. This is necessary since we only store the hashed version of the tokens in the db. If you notice, we allow multiple tokens to be stored per user. Here’s an example of the db schema we can use to store password reset tokens. ![]() That way the token is only valid for a set amount of time, blocking attacks that could happen if the token never expired. token_urlsafeĪfter the token has been created, it's hashed using SHA256 and stored in the database along with the user’s ID and it's assigned an expiration time. This prevents brute force attacks mentioned above since new tokens are unguessable, and have high entropy.įor Python and use secrets. With Supertokens, the password reset token is generated using a random 64 character string. If the email does exist in the database, then we create a new password reset token, store its hashed version in the database, and generate a password reset link that's sent to the user's email address. That way we don't give attackers any indication that they should try a different email address. Even if the email doesn't exist, we'll show a message that says the email has been sent successfully. When they submit the email address, this will trigger the back-end to check if that email exists in the database. There's usually a simple form available that lets them enter the email address associated with their account. This is how users will begin the process for updating their password. User enters their email in the UI requesting a password reset To ensure that your password reset process is as secure as possible, here is a potential flow that takes into account the security issues we discussed above. The JWT secret key (or signing key) must be carefully protected and hence we do not recommend using JWTs as the password reset token. This would allot them to reset any user’s password. Whilst this makes development easy, a major risk is that if the secret key used to sign them is compromised, the attacker can use that to generate their own valid JWT. Passwords are hashed and stored and it’s important that password reset tokens are too (for the same reasons).Īnother related attack vector is the use of JWTs as the password reset token. To mitigate this risk, we store only the hashed version of tokens in the database. While there are plenty of problems with an attacker getting database access, one of them is their ability to get users' password reset tokens, like in this research on Paleohacks. They could even gain access if someone hasn't updated the default login credentials. There are several ways an attacker can gain access to an application's database: SQL injection attacks, targeting unpatched database vulnerabilities, and exploiting unused database services.
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