Password File Authentication

Presto can be configured to enable frontend password authentication over HTTPS for clients, such as the CLI, or the JDBC and ODBC drivers. The username and password are validated against usernames and passwords stored in a file.

Password file authentication is very similar to LDAP Authentication. Please see the LDAP documentation for generic instructions on configuring the server and clients to use TLS and authenticate with a username and password.

Password Authenticator Configuration

Enable password file authentication by creating an etc/password-authenticator.properties file on the coordinator:

  1. password-authenticator.name=file
  2. file.password-file=/path/to/password.db

The following configuration properties are available:

Property

Description

file.password-file

Path of the password file.

file.refresh-period

How often to reload the password file. Defaults to 5s.

file.auth-token-cache.max-size

Max number of cached authenticated passwords. Defaults to 1000.

Password Files

File Format

The password file contains a list of usernames and passwords, one per line, separated by a colon. Passwords must be securely hashed using bcrypt or PBKDF2.

bcrypt passwords start with $2y$ and must use a minimum cost of 8:

  1. test:$2y$10$BqTb8hScP5DfcpmHo5PeyugxHz5Ky/qf3wrpD7SNm8sWuA3VlGqsa

PBKDF2 passwords are composed of the iteration count, followed by the hex encoded salt and hash:

  1. test:1000:5b4240333032306164:f38d165fce8ce42f59d366139ef5d9e1ca1247f0e06e503ee1a611dd9ec40876bb5edb8409f5abe5504aab6628e70cfb3d3a18e99d70357d295002c3d0a308a0

Creating a Password File

Password files utilizing the bcrypt format can be created using the htpasswd utility from the Apache HTTP Server. The cost must be specified, as Presto enforces a higher minimum cost than the default.

Create an empty password file to get started:

  1. touch password.db

Add or update the password for the user test:

  1. htpasswd -B -C 10 password.db test