39 lines
2.3 KiB
Markdown
39 lines
2.3 KiB
Markdown
---
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stage: Manage
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group: Authentication and Authorization
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info: To determine the technical writer assigned to the Stage/Group associated with this page, see https://about.gitlab.com/handbook/engineering/ux/technical-writing/#assignments
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type: reference
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---
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# Password storage **(FREE)**
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> PBKDF2 and SHA512 [introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/360658) in GitLab 15.2 [with flags](../administration/feature_flags.md) named `pbkdf2_password_encryption` and `pbkdf2_password_encryption_write`. Disabled by default.
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GitLab stores user passwords in a hashed format to prevent passwords from being
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stored as plain text.
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GitLab uses the [Devise](https://github.com/heartcombo/devise) authentication
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library to hash user passwords. Created password hashes have these attributes:
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- **Hashing**:
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- **BCrypt**: By default, the [`bcrypt`](https://en.wikipedia.org/wiki/Bcrypt) hashing
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function is used to generate the hash of the provided password. This is a
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strong, industry-standard cryptographic hashing function.
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- **PBKDF2 and SHA512**: Starting in GitLab 15.2, PBKDF2 and SHA512 are supported
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behind the following feature flags (disabled by default):
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- `pbkdf2_password_encryption` - Enables reading and comparison of PBKDF2 + SHA512
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hashed passwords and supports fallback for BCrypt hashed passwords.
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- `pbkdf2_password_encryption_write` - Enables new passwords to be saved
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using PBKDF2 and SHA512, and existing BCrypt passwords to be migrated when users sign in.
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FLAG:
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On self-managed GitLab, by default this feature is not available. To make it available,
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ask an administrator to [enable the feature flags](../administration/feature_flags.md) named `pbkdf2_password_encryption` and `pbkdf2_password_encryption_write`.
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- **Stretching**: Password hashes are [stretched](https://en.wikipedia.org/wiki/Key_stretching)
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to harden against brute-force attacks. By default, GitLab uses a stretching
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factor of 10 for BCrypt and 20,000 for PBKDF2 + SHA512.
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- **Salting**: A [cryptographic salt](https://en.wikipedia.org/wiki/Salt_(cryptography))
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is added to each password to harden against pre-computed hash and dictionary
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attacks. To increase security, each salt is randomly generated for each
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password, with no two passwords sharing a salt.
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