pahaz/sshtunnelTúneis SSH para servidor remoto.
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Autor: Pahaz_
Repositório: https://github.com/pahaz/sshtunnel/
Inspirado por https://github.com/jmagnusson/bgtunnel, que não funciona no Windows.
Veja também: https://github.com/paramiko/paramiko/blob/master/demos/forward.py
paramiko_sshtunnel_ está no PyPI, então simplesmente execute:
::
pip install sshtunnel
ou ::
easy_install sshtunnel
ou ::
conda install -c conda-forge sshtunnel
para tê-lo instalado no seu ambiente.
Para instalar a partir do código fonte, clone o
repositório <https://github.com/pahaz/sshtunnel>_ e execute::
python setup.py install
Para executar os testes você primeiro precisa do
tox <https://testrun.org/tox/latest/>_ e execute::
python setup.py test
Um dos cenários típicos onde sshtunnel é útil está representado na figura
abaixo. O usuário pode precisar conectar uma porta de um servidor remoto (por
exemplo, 8080) onde apenas a porta SSH (geralmente porta 22) é acessível. ::
----------------------------------------------------------------------
|
-------------+ | +----------+
LOCAL | | | REMOTE | :22 SSH
CLIENT | <== SSH ========> | SERVER | :8080 web service
-------------+ | +----------+
|
FIREWALL (only port 22 is open)
----------------------------------------------------------------------
Fig1: Como conectar-se a um serviço bloqueado por um firewall através de um túnel SSH.
Se permitido pelo servidor SSH, também é possível alcançar um servidor privado
(da perspectiva do REMOTE SERVER) não diretamente visível de fora
(perspectiva do LOCAL CLIENT). ::
----------------------------------------------------------------------
|
-------------+ | +----------+ +---------
LOCAL | | | REMOTE | | PRIVATE
CLIENT | <== SSH ========> | SERVER | <== local ==> | SERVER
-------------+ | +----------+ +---------
|
FIREWALL (only port 443 is open)
----------------------------------------------------------------------
Fig2: Como conectar-se ao PRIVATE SERVER através de um túnel SSH.
A API permite inicializar o túnel e iniciá-lo ou usar um contexto with,
que cuidará de iniciar e parar o túnel:
O código correspondente à Fig1 acima segue, dado que o endereço do servidor
remoto é pahaz.urfuclub.ru, autenticação por senha e porta de vinculação
local atribuída aleatoriamente.
.. code-block:: python
from sshtunnel import SSHTunnelForwarder
server = SSHTunnelForwarder(
'alfa.8iq.dev',
ssh_username="pahaz",
ssh_password="secret",
remote_bind_address=('127.0.0.1', 8080)
)
server.start()
print(server.local_bind_port) # show assigned local port
# work with `SECRET SERVICE` through `server.local_bind_port`.
server.stop()
Exemplo de encaminhamento de porta para um servidor privado não diretamente acessível, assumindo autenticação por chave privada protegida por senha, o serviço SSH do servidor remoto está escutando na porta 443 e essa porta está aberta no firewall (Fig2):
.. code-block:: python
import paramiko
import sshtunnel
with sshtunnel.open_tunnel(
(REMOTE_SERVER_IP, 443),
ssh_username="",
ssh_pkey="/var/ssh/rsa_key",
ssh_private_key_password="secret",
remote_bind_address=(PRIVATE_SERVER_IP, 22),
local_bind_address=('0.0.0.0', 10022)
) as tunnel:
client = paramiko.SSHClient()
client.load_system_host_keys()
client.set_missing_host_key_policy(paramiko.AutoAddPolicy())
client.connect('127.0.0.1', 10022)
# do some operations with client session
client.close()
print('FINISH!')
Exemplo de encaminhamento de porta para a porta local MySQL do Vagrant:
.. code-block:: python
from sshtunnel import open_tunnel
from time import sleep
with open_tunnel(
('localhost', 2222),
ssh_username="vagrant",
ssh_password="vagrant",
remote_bind_address=('127.0.0.1', 3306)
) as server:
print(server.local_bind_port)
while True:
# press Ctrl-C for stopping
sleep(1)
print('FINISH!')
Ou simplesmente usando a CLI:
.. code-block:: console
(bash)$ python -m sshtunnel -U vagrant -P vagrant -L :3306 -R 127.0.0.1:3306 -p 2222 localhost
Abrindo uma sessão SSH saltando por dois túneis. O transporte SSH e os túneis serão daemonizados, o que não esperará que as conexões parem no momento do fechamento.
.. code-block:: python
import sshtunnel
from paramiko import SSHClient
with sshtunnel.open_tunnel(
ssh_address_or_host=('GW1_ip', 20022),
remote_bind_address=('GW2_ip', 22),
) as tunnel1:
print('Connection to tunnel1 (GW1_ip:GW1_port) OK...')
with sshtunnel.open_tunnel(
ssh_address_or_host=('localhost', tunnel1.local_bind_port),
remote_bind_address=('target_ip', 22),
ssh_username='GW2_user',
ssh_password='GW2_pwd',
) as tunnel2:
print('Connection to tunnel2 (GW2_ip:GW2_port) OK...')
with SSHClient() as ssh:
ssh.connect('localhost',
port=tunnel2.local_bind_port,
username='target_user',
password='target_pwd',
)
ssh.exec_command(...)
::
$ sshtunnel --help
usage: sshtunnel [-h] [-U SSH_USERNAME] [-p SSH_PORT] [-P SSH_PASSWORD] -R
IP:PORT [IP:PORT ...] [-L [IP:PORT ...]] [-k SSH_HOST_KEY]
[-K KEY_FILE] [-S KEY_PASSWORD] [-t] [-v] [-V] [-x IP:PORT]
[-c SSH_CONFIG_FILE] [-z] [-n] [-d [FOLDER ...]]
ssh_address
Pure python ssh tunnel utils
Version 0.4.0
positional arguments:
ssh_address SSH server IP address (GW for SSH tunnels)
set with "-- ssh_address" if immediately after -R or -L
options:
-h, --help show this help message and exit
-U SSH_USERNAME, --username SSH_USERNAME
SSH server account username
-p SSH_PORT, --server_port SSH_PORT
SSH server TCP port (default: 22)
-P SSH_PASSWORD, --password SSH_PASSWORD
SSH server account password
-R IP:PORT [IP:PORT ...], --remote_bind_address IP:PORT [IP:PORT ...]
Remote bind address sequence: ip_1:port_1 ip_2:port_2 ... ip_n:port_n
Equivalent to ssh -Lxxxx:IP_ADDRESS:PORT
If port is omitted, defaults to 22.
Example: -R 10.10.10.10: 10.10.10.10:5900
-L [IP:PORT ...], --local_bind_address [IP:PORT ...]
Local bind address sequence: ip_1:port_1 ip_2:port_2 ... ip_n:port_n
Elements may also be valid UNIX socket domains:
/tmp/foo.sock /tmp/bar.sock ... /tmp/baz.sock
Equivalent to ssh -LPORT:xxxxxxxxx:xxxx, being the local IP address optional.
By default it will listen in all interfaces (0.0.0.0) and choose a random port.
Example: -L :40000
-k SSH_HOST_KEY, --ssh_host_key SSH_HOST_KEY
Gateway's host key
-K KEY_FILE, --private_key_file KEY_FILE
RSA/DSS/ECDSA private key file
-S KEY_PASSWORD, --private_key_password KEY_PASSWORD
RSA/DSS/ECDSA private key password
-t, --threaded Allow concurrent connections to each tunnel
-v, --verbose Increase output verbosity (default: ERROR)
-V, --version Show version number and quit
-x IP:PORT, --proxy IP:PORT
IP and port of SSH proxy to destination
-c SSH_CONFIG_FILE, --config SSH_CONFIG_FILE
SSH configuration file, defaults to ~/.ssh/config
-z, --compress Request server for compression over SSH transport
-n, --noagent Disable looking for keys from an SSH agent
-d [FOLDER ...], --host_pkey_directories [FOLDER ...]
List of directories where SSH pkeys (in the format `id_*`) may be found
.. _Pahaz: https://github.com/pahaz
.. _sshtunnel: https://pypi.python.org/pypi/sshtunnel
.. paramiko: http://www.paramiko.org/
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