We Keep Coding

How to use python's sshtunnel to connect to a router running only telnet?

I have to connect to a jumpserver to connect to a bunch of routers running only telnet. I'm new to SSH tunneling, but I've figured out that on the command line on my local machine, the following command forms the necessary tunnel:
$ ssh -fNL 2300:remote_host:23 user#jumpServer
Then all I have to do is connect to port 2300 on the local machine for the traffic to be forwarded to port 23 on the router (which doesn't have SSH and only has telnet):
> telnet localhost 2300
I have a few questions:
Where does the actual tunnel form? As I said, the router has port 22 blocked, i.e., it isn't capable of running SSH. However, my local machine and the gateway/jumpserver can. So, if the tunnel's forming between my local machine and the jump server, what is the mode of transport between the jumpserver and the router?
If I understand this right, there's a listener on my local machine on port 2300, that forwards all traffic to some port on the jump server via the SSH tunnel, that then forwards it to the router. Right?
[Python Specific question] How do I get the sshtunnel module to do this programmatically? I tried the following:
from sshtunnel import open_tunnel
from telnetlib import Telnet
js = '123.456.555.666'
js_usr = "user"
rem_host = '123.456.789.101'
with open_tunnel(
ssh_address_or_host=(js, 22),
ssh_username=js_usr,
ssh_password="password",
remote_bind_address=(rem_host, 23)
) as tunnel:
with Telnet(js, tunnel.local_bind_port, 10) as tn:
tn.interact()
However, this throws the following error:
Traceback (most recent call last):
File "C:/Users/somsinha/PycharmProjects/SysTEst/sshTunnelTest.py", line 14, in
with Telnet(js, tunnel.local_bind_port, 10) as tn:
File "C:\Users\somsinha\bin\WPy64-3741\python-3.7.4.amd64\lib\telnetlib.py", line 218, in init
self.open(host, port, timeout)
File "C:\Users\somsinha\bin\WPy64-3741\python-3.7.4.amd64\lib\telnetlib.py", line 234, in open
self.sock = socket.create_connection((host, port), timeout)
File "C:\Users\somsinha\bin\WPy64-3741\python-3.7.4.amd64\lib\socket.py", line 727, in create_connection
raise err
File "C:\Users\somsinha\bin\WPy64-3741\python-3.7.4.amd64\lib\socket.py", line 716, in create_connection
sock.connect(sa)
ConnectionRefusedError: [WinError 10061] No connection could be made because the target machine actively refused it
How to I make python ssh -fNL 2300:remote_host:23 user#jumpServer manually?

Everything is right with your code except use should use "localhost" with telnet:
from sshtunnel import open_tunnel
from telnetlib import Telnet
js = '123.456.555.666'
js_usr = "user"
rem_host = '123.456.789.101'
with open_tunnel(
ssh_address_or_host=(js, 22),
ssh_username=js_usr,
ssh_password="password",
remote_bind_address=(rem_host, 23)
) as tunnel:
# Use localhost as host
with Telnet('localhost', tunnel.local_bind_port, 10) as tn:
tn.interact()
The reason is the port is forwarded to the localhost and it must be accessed from it.

MongoDB Server Configuration

I have a MongoDB server running on my localhost. I wrote a simple Python program that reads/writes to the database using "localhost"; however, I want to give other clients access to my MongoDB server. For now, I am not concerned about access security and would like to grant access to anyone. How should I configure the Mongo Server to do this?
Here is the simple program connecting to localhost.
from pymongo import MongoClient
connection = MongoClient("Localhost")
db = connection.hockey.players
results = db.find()
print()
print('+-+-+-+-+-+-+-+-+-+-+-+-+-+-')
for record in results:
print(record['name'] + ',',record['position'])
connection.close()
The error message I'm getting:
File "C:/Users/Peter/PycharmProjects/Test/helloWorld.py", line 8, in
for record in results:
File "C:\Python34\lib\site-packages\pymongo\cursor.py", line 1097, in next
if len(self.__data) or self._refresh():
File "C:\Python34\lib\site-packages\pymongo\cursor.py", line 1019, in _refresh self.__read_concern))
File "C:\Python34\lib\site-packages\pymongo\cursor.py", line 850, in __send_message **kwargs)
File "C:\Python34\lib\site-packages\pymongo\mongo_client.py", line 777, in _send_message_with_response server = topology.select_server(selector)
File "C:\Python34\lib\site-packages\pymongo\topology.py", line 142, in select_server address))
File "C:\Python34\lib\site-packages\pymongo\topology.py", line 118, in select_servers self._error_message(selector))
pymongo.errors.ServerSelectionTimeoutError: x.y.z.w:27017: timed out
Process finished with exit code 1
Below is my current localhost setup that works fine if I run it on my client which hosts the MongoDB. Current setup
Thanks

Give them your ip address and the port number (Default:27017) to connect to your server. Also edit the bindIp in the mongod.conf file as bindIp: 0.0.0.0. Ask them to connect to your database by using something like:
from pymongo import MongoClient
connection = MongoClient("mongodb://your_ip:yourport")
If you're on windows, create the configuration file mongod.cfg. And add the entry as
systemLog:
destination: file
path: c:\data\log\mongod.log
storage:
dbPath: c:\data\db
net:
bindIp: 0.0.0.0
port: 27017
Make sure you've already created log and db folder or change the path where your data and log folder are located.
Start the mongodb by specyfying thr configuration file.

Verify that you local interface is up. It should explain the timeout.
ifup lo

Error 2003 Can't connect to MySQL server on 'localhost' PyMySQL

I'm not really sure what to do here. I'm trying to connect to MySQL Community Server by using a python script, and I'm running into an error message. This is being run on OS X Yosemite. I'm using the PyMySQL module, which imports correctly. The line
con = pms.connect(host='localhost',user='jaxon',passwd='password')
throws the following error message:
Traceback (most recent call last):
File "/Users/icefreak21/Documents/Python Files/DBConnector.py", line 4, in <module>
con = pms.connect(host='127.0.0.1',user='root',passwd='c0c0_puFF')
File "/Users/icefreak21/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/pymysql/__init__.py", line 88, in Connect
return Connection(*args, **kwargs)
File "/Users/icefreak21/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/pymysql/connections.py", line 644, in __init__
self._connect()
File "/Users/icefreak21/Library/Enthought/Canopy_64bit/User/lib/python2.7/site-packages/pymysql/connections.py", line 869, in _connect
raise exc
pymysql.err.OperationalError: (2003, "Can't connect to MySQL server on 'localhost' ([Errno 61] Connection refused)")
I've searched around on the site and haven't found a question that details this particular situation. As far as I can tell, the server is running; the kicker is that I have no problem connecting through the command line with the same host, user, and password. I've tried switching the host name to '127.0.0.1' and I've tried specifying the port number (3306).
I found one solution that suggested specifying the socket, but when I ran the suggested code
./mysqladmin variables | grep socket
to find the socket file to specify, I get the following error code:
./mysqladmin: connect to server at 'localhost' failed
error: 'Access denied for user 'jaxon'#'localhost' (using password: NO)'
Does anyone have any other suggestions?

I had the same problem. I solved it by changing the port. You can add your port like this:
3307(port = 3307)
I'm recommending this because the mysql port of mac vision might be 3307.

Can't connect to MariaDB

So I have two AWS servers in question, one is running MariaDB and the other is my API server (python based). I can connect just fine locally on the MariaDB server as well as my dev computer. I cannot connect from the API server nor a third AWS server.
netstat output
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 *:mysql *:* LISTEN 1363/mysqld
ngrep on API server shows
interface: eth0 (10.[api ip]/255.255.255.0)
filter: (ip or ip6) and ( port 3306 )
##########
ngrep on Maria Server
interface: eth0 ([maria ip]/255.255.255.0)
filter: (ip or ip6) and ( port 3306 )
####
T [maria ip]:3306 -> [dev ip]:2392 [AP]
[redacted]
##
T [dev ip]:2392 -> [maria ip]:3306 [AP]
[redacted]
##
T [maria ip]:3306 -> [dev ip]:2392 [AP]
[redacted]
#######################
Eventually I get this error
ERROR 2003 (HY000): Can't connect to MySQL server on '[maria ip]' (110 "Connection timed out")
or from my python script
Exception happened during processing of request from ('127.0.0.1', 50110)
Traceback (most recent call last):
File "/usr/lib/python2.7/SocketServer.py", line 295, in _handle_request_noblock
self.process_request(request, client_address)
File "/usr/lib/python2.7/SocketServer.py", line 321, in process_request
self.finish_request(request, client_address)
File "/usr/lib/python2.7/SocketServer.py", line 334, in finish_request
self.RequestHandlerClass(request, client_address, self)
File "/usr/lib/python2.7/SocketServer.py", line 651, in __init__
self.finish()
File "/usr/lib/python2.7/SocketServer.py", line 710, in finish
self.wfile.close()
File "/usr/lib/python2.7/socket.py", line 279, in close
self.flush()
File "/usr/lib/python2.7/socket.py", line 303, in flush
self._sock.sendall(view[write_offset:write_offset+buffer_size])
error: [Errno 32] Broken pipe
----------------------------------------
Before somebody mentions it, my IP tables are set correctly and AWS SecGrps are not the issue either.
This is not a duplicate of Trying to connect to remote MySQL host (error 2003) as (1) there are no (logical) devices between the server, (2) I can connect from my Dev station on the other side of the country, and (3) none of the "fixes" worked.
Also I can connect from API script to Redis Server running on my maria server.

I think you have to follow these steps as below:
Allow remote connect on MariaDB AWS server on 3306 port (depend on your config)
Check the Firewall (Security Group --> Inbound setting) on your Maria AWS server, this server have to allow access via 3306 port from IP address of API Server.
Check the Firewall (Security Group --> Oubound setting. By default AWS server allow all ports) on your API AWS server.
Reference # http://docs.aws.amazon.com/AWSEC2/latest/UserGuide/using-network-security.html

'Interface error: 2003' when connecting to database

I'm trying to use MySQL Connection/Python to connect to my database.
Here's the output I'm getting:
Traceback (most recent call last):
File "bh2000.py", line 33, in <module>
cnx = mysql.connector.connect(**config)
File "/Library/Python/2.7/site-packages/mysql/connector/__init__.py", line 155, in connect
return MySQLConnection(*args, **kwargs)
File "/Library/Python/2.7/site-packages/mysql/connector/connection.py", line 123, in __init__
self.connect(**kwargs)
File "/Library/Python/2.7/site-packages/mysql/connector/connection.py", line 430, in connect
self._open_connection()
File "/Library/Python/2.7/site-packages/mysql/connector/connection.py", line 393, in _open_connection
self._socket.open_connection()
File "/Library/Python/2.7/site-packages/mysql/connector/network.py", line 375, in open_connection
errno=2003, values=(self.get_address(), _strioerror(err)))
mysql.connector.errors.InterfaceError: 2003: Can't connect to MySQL server on 'host xxx.db.1and1.com:3306' (8 nodename nor servname provided, or not known)
Here's the code I'm using:
import mysql.connector
cnx = mysql.connector.connect(user='xxx', password='xxx',
host='xxx.db.1and1.com',
database='xxx')
cnx.close()
Where am I going wrong?

Did you specify the correct port?
Is your MySQL server running?
Is a firewall blocking access?
Try removing anonymous user account from your MySQL server?
Default port if not specified is 3306. Otherwise there is nothing wrong with your code. The problem is with your MySQL server or the connection is being blocked by your firewall or the server firewall. Make sure port 3306 is open and not blocked.
db = mysql.connector.connect(user='xxx', password='xxx', host='xxx.db.1and1.com', port=3306)

I believe the answer is because the hosting service you use, 1and1.com, uses a firewall that blocks all outside access to their databases. You have to run the code from a url that they host or it will not work.
I use the same server and had to figure this out the hard way myself. Below is a copy of what they have on one of their pages:
Access to the database via your website/presence only Please always
establish the connection to your database via your website/presence.
For security reasons, it is not possible to access the database
directly, for example via your local computer (external ODBC
connection).
To protect your data, your MySQL database is located on a dedicated
database server that is protected by a firewall.

Add a port argument in the command.
cnx = mysql.connector.connect(user='myuser',
password='mypassword', host='localhost', port='3306', database='mydb')

I got the same error. Once crosscheck the details you have entered. The host must be in the format 127.0.0.1. There should not be any / after the url.

Use localhost instead of IP, if you are working on same server.
myConnection = mysql.connector.connect(user='uname', password='pass', host='localhost', port='3306', database='databasename')