Sep
02
2009
Good Night,
If you want to execute commands in console using python you can use the pexpect library. You can get it in http://sourceforge.net/projects/pexpect/. To install it use:
$ sudo python setup.py install
After install it, you can have fun. I did a small script to test it.
import pexpect
class SSH():
def connect(self):
x = True
sshConnection = pexpect.spawn(‘ssh -l matheus -p 22 192.168.0.254′)
sshConnection.expect(‘matheus@192.168.0.254\’s password:’)
sshConnection.sendline(‘password’)
while True:
print sshConnection.readline();
if x is True:
sshConnection.sendline(‘uptime’)
x = False
sshConnection.readline();
s = SSH()
s.connect()
If you have any problem try to use:
$ sudo apt-get install python-dev
Example connect to SSH using Python
Matheus
May
20
2009
Good night,
To install ssh server in Ubuntu use:
$ sudo apt-get install openssh-server
To let it safer edit /etc/ssh/sshd_config
$ sudo vi /etc/ssh/sshd_config
Than change the lines:
AllowUsers USER
AllowGroups GROUP_USER
PasswordAuthentication yes
MaxStartups 2:100:2
Port XXX # Change the port
What MaxStartups do? Specify the number of un authenticated connections in server. The syntax is start:percent:max. Example: 10:50:20. When it gets to 10 connections it will start with the percent. So every new connection will have 50% of chance to be automaticlly refused. When it gets to 20. It will denied ALL the new connections.
If you want, you can ask for a second password, if you type it wrong, it will close the connection:
Edit /home/user/.profile
echo Put your password
read senha
if [ $senha == "SOMETHING" ]
then
# CODES THAT ALREADY ARE AT .profile
else
exit
fi
With this you can do some tricks, to create a new RANDOM password every time somebody connect and send it to your e-mail. So you will need to put your normal password, than access your e-mail account, verify the new password and type it.
Best Regards,
Matheus
References:
Desabilitar Comando SU
Informação MaxStartups
May
13
2009
Hey,
Just a fast tip, if you want to have a ssh server more secure disable root access in “/etc/ssh/sshd_config”
Find the line starting with PermitRootLogin and set it to nojust like this:
PermitRootLogin no.
I already setup my ubuntu server, and have infos about ssh and other configurations. I’m translating the old articles to english first, so don’t get angry if I take a little time to post it. I hope in the next month the portuguese version and the english, start to run together 
Bye,
Matheus
