On 17Sep2019 13:02, lampahome <pahome.c...@mirlab.org> wrote:
Note also that since stdin and stdout are pipes and not the terminal
then ssh will not be interactive, and will not allocate a tty at the far
end either. You can get ssh to open a remote tty with the -t option.
But I suspect you don't want stdin=PIPE or stdout=PIPE at all. Why are
they there?
I thought I can use ps.stdin.write(password), so I make stdin and
stdout be pipe as input and output.
The trouble here is that ssh will only accept a password from a
terminal. As soon as you connect a pipe it refuses to prompt. This is
partly security (having a terminal is a proxy for "talking to a human"),
and partly because ssh normally passes stdin to the remote process once
authentication is complete, so things get fiddly.
You can give it a terminal by obtaining a pty and associating the
subprocess with that. You could install the pexpect module with "pip
install pexpect" and use that to manage this interaction. See the docs:
https://pexpect.readthedocs.io/en/stable/
for further info.
However, I repeat my recommendation to use a keypair for the
authentication, as it avoids needing interactive passwords (and having
your programme know the password has its own suite of problems to do
with where that password comes from).
Here are I tried:
from subprocess import Popen, PIPE
ps = Popen('ssh -o \'StrictHostKeyChecking no\' hello@192.168.80.11 \'sudo
sysctl -w vm.drop_caches=3\', shell=True)
hello@192.168.80.11's password:
from subprocess import Popen, PIPE
ps = Popen(['ssh', '-o \'StrictHostKeyChecking no\'', '
hello@192.168.80.11', '\'sudo sysctl -w vm.drop_caches=3\''])
hello@192.168.80.11's password:
It always prompt immediately, that make me hard to enter password.
Well ssh will be connected to your terminal. Do things work if you hand
type the password at that point?
Maybe I should try paramiko...
Or pexpect.
But use a keypair - it will simplify your life, and generally be far
more secure anyway.
Cheers,
Cameron Simpson <c...@cskk.id.au>
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