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# 🚀 SSH for GitHub Actions
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[繁體中文](./README.zh-tw.md)
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[GitHub Action](https://github.com/features/actions) for executing remote ssh commands.
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[](https://github.com/appleboy/ssh-action/actions)
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**Important**: Only support **Linux** [docker](https://www.docker.com/) container.
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This thing is built using [Golang](https://go.dev) and [drone-ssh](https://github.com/appleboy/drone-ssh). 🚀
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## Input variables
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See [action.yml](./action.yml) for more detailed information.
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| Input Parameter | Description | Default Value |
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|-------------------------|-----------------------------------------------------------------|---------------|
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| host | SSH host address | |
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| port | SSH port number | 22 |
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| passphrase | SSH key passphrase | |
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| username | SSH username | |
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| password | SSH password | |
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| sync | Enable synchronous execution if multiple hosts | false |
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| use_insecure_cipher | Include more ciphers with use_insecure_cipher | false |
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| cipher | Allowed cipher algorithms. If unspecified, a sensible default | |
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| timeout | Timeout duration for SSH to host | 30s |
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| command_timeout | Timeout duration for SSH command | 10m |
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| key | Content of SSH private key. e.g., raw content of ~/.ssh/id_rsa | |
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| key_path | Path of SSH private key | |
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| fingerprint | SHA256 fingerprint of the host public key | |
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| proxy_host | SSH proxy host | |
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| proxy_port | SSH proxy port | 22 |
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| proxy_username | SSH proxy username | |
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| proxy_password | SSH proxy password | |
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| proxy_passphrase | SSH proxy key passphrase | |
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| proxy_timeout | Timeout for SSH to proxy host | 30s |
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| proxy_key | Content of SSH proxy private key | |
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| proxy_key_path | Path of SSH proxy private key | |
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| proxy_fingerprint | SHA256 fingerprint of the proxy host public key | |
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| proxy_cipher | Allowed cipher algorithms for the proxy | |
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| proxy_use_insecure_cipher | Include more ciphers with use_insecure_cipher for the proxy | false |
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| script | Execute commands | |
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| script_stop | Stop script after first failure | false |
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| envs | Pass environment variables to shell script | |
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| envs_format | Flexible configuration of environment value transfer | |
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| debug | Enable debug mode | false |
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| allenvs | Pass all environment variables to shell script | false |
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## Usage
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Executing remote ssh commands.
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```yaml
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name: remote ssh command
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on: [push]
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jobs:
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build:
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name: Build
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runs-on: ubuntu-latest
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steps:
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- name: executing remote ssh commands using password
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uses: appleboy/ssh-action@v1.0.1
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with:
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host: ${{ secrets.HOST }}
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username: ${{ secrets.USERNAME }}
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password: ${{ secrets.PASSWORD }}
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port: ${{ secrets.PORT }}
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script: whoami
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```
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output:
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```sh
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======CMD======
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whoami
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======END======
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out: ***
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==============================================
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✅ Successfully executed commands to all host.
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==============================================
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```
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### Setting up a SSH Key
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Make sure to follow the below steps while creating SSH Keys and using them.
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The best practice is create the SSH Keys on local machine not remote machine.
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Login with username specified in Github Secrets. Generate a RSA Key-Pair:
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### Generate rsa key
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```bash
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ssh-keygen -t rsa -b 4096 -C "your_email@example.com"
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```
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### Generate ed25519 key
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```bash
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ssh-keygen -t ed25519 -a 200 -C "your_email@example.com"
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```
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Add newly generated key into Authorized keys. Read more about authorized keys [here](https://www.ssh.com/ssh/authorized_keys/).
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### Add rsa key into Authorized keys
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```bash
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cat .ssh/id_rsa.pub | ssh b@B 'cat >> .ssh/authorized_keys'
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```
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### Add ed25519 key into Authorized keys
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```bash
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cat .ssh/id_ed25519.pub | ssh b@B 'cat >> .ssh/authorized_keys'
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```
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Copy Private Key content and paste in Github Secrets.
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### Copy rsa Private key
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```bash
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clip < ~/.ssh/id_rsa
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```
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### Copy ed25519 Private key
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```bash
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clip < ~/.ssh/id_ed25519
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```
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See the detail information about [SSH login without password](http://www.linuxproblem.org/art_9.html).
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**A note** from one of our readers: Depending on your version of SSH you might also have to do the following changes:
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* Put the public key in `.ssh/authorized_keys2`
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* Change the permissions of `.ssh` to 700
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* Change the permissions of `.ssh/authorized_keys2` to 640
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### If you are using OpenSSH
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If you are currently using OpenSSH and are getting the following error:
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```bash
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ssh: handshake failed: ssh: unable to authenticate, attempted methods [none publickey]
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```
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Make sure that your key algorithm of choice is supported. On Ubuntu 20.04 or later you must explicitly allow the use of the ssh-rsa algorithm. Add the following line to your OpenSSH daemon file (which is either `/etc/ssh/sshd_config` or a drop-in file under `/etc/ssh/sshd_config.d/`):
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```bash
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CASignatureAlgorithms +ssh-rsa
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```
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Alternatively, `ed25519` keys are accepted by default in OpenSSH. You could use this instead of rsa if needed:
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```bash
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ssh-keygen -t ed25519 -a 200 -C "your_email@example.com"
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```
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### Example
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#### Executing remote ssh commands using password
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```yaml
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- name: executing remote ssh commands using password
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uses: appleboy/ssh-action@v1.0.1
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with:
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host: ${{ secrets.HOST }}
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username: ${{ secrets.USERNAME }}
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password: ${{ secrets.PASSWORD }}
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port: ${{ secrets.PORT }}
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script: whoami
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```
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#### Using private key
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```yaml
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- name: executing remote ssh commands using ssh key
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uses: appleboy/ssh-action@v1.0.1
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with:
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host: ${{ secrets.HOST }}
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username: ${{ secrets.USERNAME }}
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key: ${{ secrets.KEY }}
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port: ${{ secrets.PORT }}
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script: whoami
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```
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#### Multiple Commands
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```yaml
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- name: multiple command
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uses: appleboy/ssh-action@v1.0.1
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with:
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host: ${{ secrets.HOST }}
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username: ${{ secrets.USERNAME }}
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key: ${{ secrets.KEY }}
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port: ${{ secrets.PORT }}
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script: |
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whoami
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ls -al
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```
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#### Multiple Hosts
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```diff
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- name: multiple host
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uses: appleboy/ssh-action@v1.0.1
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with:
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- host: "foo.com"
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+ host: "foo.com,bar.com"
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username: ${{ secrets.USERNAME }}
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key: ${{ secrets.KEY }}
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port: ${{ secrets.PORT }}
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script: |
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whoami
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ls -al
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```
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#### Multiple hosts with different port
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```diff
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- name: multiple host
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uses: appleboy/ssh-action@v1.0.1
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with:
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- host: "foo.com"
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+ host: "foo.com:1234,bar.com:5678"
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username: ${{ secrets.USERNAME }}
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key: ${{ secrets.KEY }}
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script: |
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whoami
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ls -al
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```
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#### Synchronous execution on multiple hosts
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```diff
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- name: multiple host
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uses: appleboy/ssh-action@v1.0.1
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with:
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host: "foo.com,bar.com"
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+ sync: true
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username: ${{ secrets.USERNAME }}
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key: ${{ secrets.KEY }}
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port: ${{ secrets.PORT }}
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script: |
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whoami
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ls -al
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```
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#### Pass environment variable to shell script
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```diff
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- name: pass environment
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uses: appleboy/ssh-action@v1.0.1
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+ env:
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+ FOO: "BAR"
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+ BAR: "FOO"
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+ SHA: ${{ github.sha }}
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with:
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host: ${{ secrets.HOST }}
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username: ${{ secrets.USERNAME }}
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key: ${{ secrets.KEY }}
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port: ${{ secrets.PORT }}
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+ envs: FOO,BAR,SHA
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script: |
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echo "I am $FOO"
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echo "I am $BAR"
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echo "sha: $SHA"
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```
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_Inside `env` object, you need to pass every environment variable as a string, passing `Integer` data type or any other may output unexpected results._
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#### Stop script after first failure
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> ex: missing `abc` folder
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```diff
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- name: stop script if command error
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uses: appleboy/ssh-action@v1.0.1
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with:
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host: ${{ secrets.HOST }}
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username: ${{ secrets.USERNAME }}
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key: ${{ secrets.KEY }}
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port: ${{ secrets.PORT }}
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+ script_stop: true
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script: |
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mkdir abc/def
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ls -al
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```
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output:
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```sh
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======CMD======
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mkdir abc/def
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ls -al
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======END======
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2019/11/21 01:16:21 Process exited with status 1
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err: mkdir: cannot create directory ‘abc/def’: No such file or directory
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##[error]Docker run failed with exit code 1
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```
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#### How to connect remote server using `ProxyCommand`?
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```bash
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+--------+ +----------+ +-----------+
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| Laptop | <--> | Jumphost | <--> | FooServer |
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+--------+ +----------+ +-----------+
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```
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in your `~/.ssh/config`, you will see the following.
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```bash
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Host Jumphost
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HostName Jumphost
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User ubuntu
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Port 22
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IdentityFile ~/.ssh/keys/jump_host.pem
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Host FooServer
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HostName FooServer
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User ubuntu
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Port 22
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ProxyCommand ssh -q -W %h:%p Jumphost
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```
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#### How to convert to YAML format of GitHubActions
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```diff
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- name: ssh proxy command
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uses: appleboy/ssh-action@v1.0.1
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with:
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host: ${{ secrets.HOST }}
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username: ${{ secrets.USERNAME }}
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key: ${{ secrets.KEY }}
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port: ${{ secrets.PORT }}
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+ proxy_host: ${{ secrets.PROXY_HOST }}
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+ proxy_username: ${{ secrets.PROXY_USERNAME }}
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+ proxy_key: ${{ secrets.PROXY_KEY }}
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+ proxy_port: ${{ secrets.PROXY_PORT }}
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script: |
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mkdir abc/def
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ls -al
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```
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#### Protecting a Private Key
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The purpose of the passphrase is usually to encrypt the private key.
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This makes the key file by itself useless to an attacker.
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It is not uncommon for files to leak from backups or decommissioned hardware, and hackers commonly exfiltrate files from compromised systems.
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```diff
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- name: ssh key passphrase
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uses: appleboy/ssh-action@v1.0.1
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with:
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host: ${{ secrets.HOST }}
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username: ${{ secrets.USERNAME }}
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key: ${{ secrets.KEY }}
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port: ${{ secrets.PORT }}
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+ passphrase: ${{ secrets.PASSPHRASE }}
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script: |
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whoami
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ls -al
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```
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#### Using host fingerprint verification
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Setting up SSH host fingerprint verification can help to prevent Person-in-the-Middle attacks. Before setting this up, run the command below to get your SSH host fingerprint. Remember to replace `ed25519` with your appropriate key type (`rsa`, `dsa`, etc.) that your server is using and `example.com` with your host.
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In modern OpenSSH releases, the _default_ key types to be fetched are `rsa` (since version 5.1), `ecdsa` (since version 6.0), and `ed25519` (since version 6.7).
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```sh
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ssh example.com ssh-keygen -l -f /etc/ssh/ssh_host_ed25519_key.pub | cut -d ' ' -f2
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```
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Now you can adjust you config:
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```diff
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- name: ssh key passphrase
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uses: appleboy/ssh-action@v1.0.1
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with:
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host: ${{ secrets.HOST }}
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username: ${{ secrets.USERNAME }}
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key: ${{ secrets.KEY }}
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port: ${{ secrets.PORT }}
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+ fingerprint: ${{ secrets.FINGERPRINT }}
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script: |
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whoami
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ls -al
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```
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## Contributing
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We would love for you to contribute to `appleboy/ssh-action`, pull requests are welcome!
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## License
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The scripts and documentation in this project are released under the [MIT License](LICENSE)
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