Q: paramiko/SSH/ how to get a remote host_key

[Charles_hans]

Thank you, Guilherme. I was running demo_sftp.py included in paramiko
download.

It seems that '.ssh/known_hosts' should be the path of a key file on my
working directory on local PC. (Right?) I replaced this with 'test_rsa.key'
in C:\paramiko-1.7.2\demos and this did not generate error. But the returned
host_keys is empty. I traced the code to 'hostkeys.py' and found that the
line

                                   e = HostKeyEntry.from_line(line)

always retuned None. This means that my remote host name should have been in
this key file. (Right?)

I am very new to paramiko. How to create such a key file (with my remote
host name)? Should I also load this key file into the remote server? Please
advise. Thanks!

Charles
1/30


2008/1/30, Charles_hans <charles_hans at yahoo.com>:
>
> I tried to get what host_key has been aquired after AutoPolicy is set. I
> added the following code just before client.close() in rosty's final code:
>
> try:
>     host_keys =
> paramiko.util.load_host_keys(os.path.expanduser('~/.ssh/known_hosts'))
> except IOError:
>     try:
>         host_keys =
> paramiko.util.load_host_keys(os.path.expanduser('~/ssh/known_hosts'))
>     except IOError:
>         print '*** Unable to open host keys file'
>
> I still got 'Unable to open host keys file'. Can you tell me how to get
> the
> remote host_key under this situation? Thanks!
>
> Charles
> 1/30/2008

Hey Charles,

If you take a look on your code, you will see that you are catching
IOError. So the problem you are noticing is related to I/O failing
such as non-existent file. Be sure to check if '~/.ssh/known_hosts'
exists, if the first try fails, check if "~/ssh/known_hosts" exists
then (since you are trying to access that file).

Cheers,

> by rosty Jan 21, 2008; 08:43am :
>
> Thank you! Now it works and the code looks like this:
>
> import paramiko
> import base64
> from paramiko import AutoAddPolicy, SSHClient
>
> client = paramiko.SSHClient()
> client.set_missing_host_key_policy(AutoAddPolicy())
> client.connect('hostIP', username='uname', password='pass')
> stdin, stdout, stderr = client.exec_command('ls')
> for line in stdout:
>     print '... ' + line.strip('\n')
>
> client.close()
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