2fa-vault

2fa-vault is a two-factor authentication agent with Hashicorp vault for storage. It allows you to share a OTP code to shared accounts with others in your organization. You should probably check out the TOTP backend for fault that does this and more anyways.

This was a project that interested me before I knew that Vault already handled this. You can use it or the TOTP backend for Vault.

2fa-vault is based on 2fa by rsc (https://github.com/rsc/2fa)

Usage:

go get -u github.com/ahamilton55/2fa-vault

2fa-vault -add [-7] [-8] [-hotp] name
2fa-vault -list
2fa-vault-vault name

2fa-vault -add name adds a new key to the 2fa-vault keychain with the given name. It prints a prompt to standard error and reads a two-factor key from standard input. Two-factor keys are short case-insensitive strings of letters A-Z and digits 2-7.

By default the new key generates time-based (TOTP) authentication codes; the -hotp flag makes the new key generate counter-based (HOTP) codes instead.

By default the new key generates 6-digit codes; the -7 and -8 flags select 7- and 8-digit codes instead.

2fa-vault -list lists the names of all the keys in the keychain.

2fa-vault name prints a two-factor authentication code from the key with the given name.

With no arguments, 2fa-vault prints two-factor authentication codes from all known time-based keys.

The default time-based authentication codes are derived from a hash of the key and the current time, so it is important that the system clock have at least one-minute accuracy.

The keychain is stored unencrypted in the text file $HOME/.2fa-vault.

Example

During GitHub 2fa-vault setup, at the “Scan this barcode with your app” step, click the “enter this text code instead” link. A window pops up showing “your two-factor secret,” a short string of letters and digits.

Add it to 2fa-vault under the name github, typing the secret at the prompt:

$ 2fa-vault -add github
2fa-vault key for github: nzxxiidbebvwk6jb
$

Then whenever GitHub prompts for a 2fa-vault code, run 2fa-vault to obtain one:

$ 2fa-vault github
268346
$

Or to type less:

$ 2fa-vault
268346	github
$