OCTOPASS: Management linux user and authentication with team or collaborator on Github.

Description

This is user management tool for linux by github. The name-resolves and authentication is provided the team or collaborator on github. Features easy handling and ease of operation.

Usage

For example, adding "Ken" to a team with github organization ...

OCTOPASS is a valid linux server, Ken will be able to ssh login with the key registered in github.

Wow!?

By OCTOPASS name resolution, you can check the id of team members of github organization.

$ id ken
uid=5458(ken) gid=2000(operators) groups=2000(operators)

You can also see a list like /etc/passwd,shadow,group by OCTOPASS. For detail --help.

$ octopass passwd
chun-li:x:14301:2000:managed by octopass:/home/chun-li:/bin/bash
dhalsim:x:8875:2000:managed by octopass:/home/dhalsim:/bin/bash
ken:x:5458:2000:managed by octopass:/home/ken:/bin/bash
ryu:x:74049:2000:managed by octopass:/home/ryu:/bin/bash
sagat:x:93011:2000:managed by octopass:/home/sagat:/bin/bash
zangief:x:8305:2000:managed by octopass:/home/zangief:/bin/bash

And OCTOPASS gets the public key from github for key authentication.

$ octopass ken
ssh-rsa AAAAB3NzaC1yc2EAAAABIwAAAQEAqUJvs1vRgHRMH9dpxYcBBV687njS2YrJ+oeIKvbAbg6yL4QsJMeElcPOlmfWEYsp8vbRLXQCTvv14XJfKmgp8V9es5P/l8r5Came3X1S/muqRMONUTdygCpfyo+BJGIMVKtH8fSsBCWfJJ1EYEesyzxqc2u44yIiczM2b461tRwW+7cHNrQ6bKEY9sRMV0p/zkOdPwle30qQml+AlS1SvbrMiiJLEW75dSSENr5M+P4ciJHYXhsrgLE95+ThFPqbznZYWixxATWEYMLiK6OrSy5aYss4o9mvEBJozyrVdKyKz11zSK2D4Z/JTh8eP+NxAw5otqBmfNx+HhKRH3MhJQ==

Why?

I did not need functions like ldap, and asked for ease and ease of introduction. Therefore, the user only considers it as administrator authority. However, it is very easy to add a newly added user or to remove a user who leaves.

Also, in order to speedily resolve names, Github API responses are file cached. With this, even if Github is down, it will work if past caches remain.

Architecture

Installation

Ubuntu:

$ curl -s https://packagecloud.io/install/repositories/linyows/octopass/script.deb.sh | sudo bash
$ sudo apt-get install octopass

CentOS:

$ curl -s https://packagecloud.io/install/repositories/linyows/octopass/script.rpm.sh | sudo bash
$ sudo yum install octopass

Packages are provided via packagecloud.

Building from Source

Dependency

• glibc
• libcurl
• jansson

$ git clone https://github.com/linyows/octopass
$ make && make install
$ mv octopass.conf.example /etc/octopass.conf

Configuration

Edit octopass.conf:

$ mv /etc/{octopass.conf.example,octopass.conf}

Key	Description	Default
Endpoint	github endpoint	https://api.github.com
Token	github personal access token	-
Organization	github organization	-
Team	github team	-
Owner	github owner	-
Repository	github repository	-
Permission	github collaborator permission	write
Group	group on linux	same as team
Home	user home	/home/%s
Shell	user shell	/bin/bash
UidStarts	start number of uid	2000
Gid	gid	2000
Cache	github api cache sec	500
Syslog	use syslog	false
SharedUsers	share auth of specific users on team	[]

Generate token from here: https://github.com/settings/tokens/new. Need: Read org and team membership

SSHD Configuration

/etc/ssh/sshd_config:

AuthorizedKeysCommand /usr/bin/octopass
AuthorizedKeysCommandUser root
UsePAM yes
PasswordAuthentication no

PAM Configuration

Add to top of /etc/pam.d/sshd this:

auth	requisite	pam_exec.so	quiet	expose_authtok	/usr/bin/octopass pam
auth	optional	pam_unix.so	not_set_pass	use_first_pass	nodelay
session	required	pam_mkhomedir.so	skel=/etc/skel/	umask=0022

Name Service Switch Configuration

/etc/nsswitch.conf:

passwd:     files octopass sss
shadow:     files octopass sss
group:      files octopass sss

Enable OCTOPASS as name resolution.

Provisioning

• Chef cookbook - https://github.com/linyows/octopass-cookbook
• Itamae cookbook - https://github.com/hnmx4/octopass-itamae-cookbook
• Ansible playbook - https://github.com/uchida/ansible-octopass-role
• Puppet module - https://github.com/hfm/puppet-octopass

Thank you @uchida, @hnmx4 and @hfm for some provisioning tools.

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Author

linyows