cbas 142

About

This is the command line interface to the *c-bastion* jump host. It allows you to upload an ssh-key-file and create a user on the jump-host, so that you can log into it. It requires an initial connection to auth-server to obtain an (open-id-connect) access token.

The basic flow is as follows:

+-----------------+  +-----------------+  +-----------------+
|                 |  |                 |  |                 |
|    developer    |  |    jump host    |  |   auth server   |
|                 |  |                 |  |                 |
+--------+--------+  +--------+--------+  +--------+--------+
         |                    |                    |
         +----------------------------------------->
         | request token      |                    |
         <-----------------------------------------+
         | receive token      |                    |
         |                    |                    |
         +-------------------->                    |
         | upload key         +-------------------->
         |                    | validate token     |
         |                    <--------------------+
         <--------------------+                    |
         | upload OK          |                    |
         |                    |                    |
         +-------------------->                    |
         | ssh log in         |                    |
         |                    |                    |
         |                    |                    |
         |                    |                    |
         +                    +                    +

Where developer is your local machine (desktop, laptop, etc..) auth server is the auth-server and jump host is the jump host. cbas takes care of obtaining the token and uploading the ssh-key.

Install

Use the Python standards, for example:

$ pip install cbas

Quickstart

1. Install the software.

2. Ask one of your colleagues for the auth-url, client-secret and jump-host parameters.

3. Then run the following to upload your key:

   $ cbas -a <AUTH-URL> -s <CLIENT-SECRET> -h <JUMP-HOST> upload
   ...

4. Then you should be able to login, using:

   $ ssh <JUMP-HOST>
   ...

Usage

$ cbas --help
Usage: cbas [OPTIONS] COMMAND [ARGS]...

Options:
  -v, --verbose                   Activate verbose mode.
  -c, --config <config_path>      Path to config file. Default: '~/.cbas'.
  -u, --username <username>       Username. Default: the logged in user.
  -k, --ssh-key-file <key-file>   SSH Identity to use. Default:
                                  '~/.ssh/id_rsa.pub'.
  -p, --password-provider <provider>
                                  Password provider. Default: 'prompt'.
  -a, --auth-url <auth_url>       Auth-server URL.
  -s, --client-secret <secret>    Special client secret, ask mum.
  -h, --jump-host <host>          Jump host to connect with.
  --version                       Print version and exit.
  --help                          Show this message and exit.

Commands:
  delete  Delete user.
  dry_run Dry run, sanitize all config only.
  upload  Upload ssh-key and create user.

Config-File

cbas is equipped with a powerful configuration mechanism. All relevant parameters that can be supplied on the command-line can also be supplied in the config-file, for example:

username: acid_burn
ssh-key-file: ~/.ssh/mykey_rsa.pub
auth-url: https://auth-server.example/oauth/token
client-secret: mysupersecret
password-provider: keyring
jump-host: jump-host.example

Please note that, any parameters supplied on the command line will take precedence over those supplied via the config-file. If in doubt, try using the --verbose switch.

License

Copyright 2016 Immobilien Scout GmbH

Licensed under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at

http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.