GitLab administrators can configure how passwords and OAuth tokens are stored.
GitLab stores user passwords in a hashed format to prevent passwords from being stored as plain text.
GitLab uses the Devise authentication library to hash user passwords. Created password hashes have these attributes:
bcrypt: By default, the
bcrypthashing function is used to generate the hash of the provided password. This cryptographic hashing function is strong and industry-standard.
- PBKDF2+SHA512: PBKDF2+SHA512 is supported:
- bcrypt: By default, the
- Stretching: Password hashes are stretched to harden against brute-force attacks. By default, GitLab uses a stretching factor of 10 for bcrypt and 20,000 for PBKDF2 + SHA512.
- Salting: A cryptographic salt is added to each password to harden against pre-computed hash and dictionary attacks. To increase security, each salt is randomly generated for each password, with no two passwords sharing a salt.
OAuth access tokens are stored in the database in PBKDF2+SHA512 format. As with PBKDF2+SHA512 password storage, access token values are stretched 20,000 times to harden against brute-force attacks.