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mkpasswd: Protect Passwords with bcrypt

The server supports hashing of passwords and authentication tokens using bcrypt. To take advantage of this, simply replace the plaintext password in the configuration with its bcrypt hash, and the server will automatically utilize bcrypt as needed.

A utility for creating bcrypt hashes is included with the nats-server distribution (util/mkpasswd.go). Running it with no arguments will generate a new secure password along with the associated hash. This can be used for a password or a token in the configuration.

Installing mkpasswd

If you have go installed, you can easily install the mkpasswd tool by doing:

> go get

Alternatively, you can:

> git clone
> cd nats-server/util/mkpasswd
> go install mkpasswd.go

Generating bcrypted passwords

With mkpasswd installed:

> mkpasswd
pass: #IclkRPHUpsTmACWzmIGXr
bcrypt hash: $2a$11$3kIDaCxw.Glsl1.u5nKa6eUnNDLV5HV9tIuUp7EHhMt6Nm9myW1aS

If you already have a password selected, you can supply the -p flag on the command line, enter your desired password, and a bcrypt hash will be generated for it:

> mkpasswd -p
Enter Password: *******
Reenter Password: ******
bcrypt hash: $2a$11$3kIDaCxw.Glsl1.u5nKa6eUnNDLV5HV9tIuUp7EHhMt6Nm9myW1aS

To use the password on the server, add the hash into the server configuration file's authorization section.

  authorization {
    user: derek
    password: $2a$11$3kIDaCxw.Glsl1.u5nKa6eUnNDLV5HV9tIuUp7EHhMt6Nm9myW1aS

Note the client will still have to provide the plain text version of the password, the server however will only store the hash to verify that the password is correct when supplied.

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