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MIT

sshcommand Build Status

Simplifies running a single command over SSH, and manages authorized keys (ACL) and users in order to do so.

It basically simplifies running:

ssh user@server 'ls -l <your-args>'

into:

ssh ls@server <your-args>

Commands

sshcommand create     <USER> <COMMAND>                 # Creates a user forced to run command when SSH connects
sshcommand acl-add    <USER> <NAME> <KEY_FILE>         # Adds named SSH key to user from STDIN or argument
sshcommand acl-remove <USER> <NAME>                    # Removes SSH key by name
sshcommand list       <USER> [<NAME>] [<OUTPUT_TYPE>]  # Lists SSH keys by user, an optional name and a optional output format (JSON)
sshcommand help       <COMMAND>                        # Shows help information
sshcommand version                                     # Shows version

Example

On a server, create a new command user:

$ sshcommand create cmd /path/to/command

On your computer, add authorized keys with your key:

$ cat ~/.ssh/id_rsa.pub | ssh root@server sshcommand acl-add cmd progrium

If the public key is already on the server, you may also specify it as an argument:

$ ssh root@server sshcommand acl-add cmd progrium ~/.ssh/id_rsa.pub

By default, key names and fingerprints must be unique. Both of these checks can be disabled by setting the following environment variables to false:

export SSHCOMMAND_CHECK_DUPLICATE_FINGERPRINT="false"
export SSHCOMMAND_CHECK_DUPLICATE_NAME="false"

Now anywhere with the private key you can easily run:

$ ssh cmd@server

Anything you pass as the command string will be appended to the command. You can use this to pass arguments or if your command takes subcommands, expose those subcommands easily.

$ /path/to/command subcommand

Can be run remotely with:

$ ssh cmd@server subcommand

When adding an authorized key, you can also specify custom options for AUTHORIZED_KEYS by specifying the SSHCOMMAND_ALLOWED_KEYS environment variable. This should be a list of comma-separated options. The default keys are as follows:

no-agent-forwarding,no-user-rc,no-X11-forwarding,no-port-forwarding

This can be useful for cases where the ssh server does not allow certain options or you wish to further constrain a user's environment. Please see man sshd for more information.

Copyright (C) 2014 Jeff Lindsay Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

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