159 lines
5.1 KiB
Plaintext
159 lines
5.1 KiB
Plaintext
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========
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paramiko
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========
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:Paramiko: Python SSH module
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:Copyright: Copyright (c) 2003-2009 Robey Pointer <robeypointer@gmail.com>
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:License: LGPL
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:Homepage: http://www.lag.net/paramiko/
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paramiko 1.7.7.1
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================
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"George" release, 21 may 2011
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What
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----
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"paramiko" is a combination of the esperanto words for "paranoid" and
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"friend". it's a module for python 2.2+ that implements the SSH2 protocol
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for secure (encrypted and authenticated) connections to remote machines.
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unlike SSL (aka TLS), SSH2 protocol does not require hierarchical
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certificates signed by a powerful central authority. you may know SSH2 as
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the protocol that replaced telnet and rsh for secure access to remote
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shells, but the protocol also includes the ability to open arbitrary
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channels to remote services across the encrypted tunnel (this is how sftp
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works, for example).
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it is written entirely in python (no C or platform-dependent code) and is
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released under the GNU LGPL (lesser GPL).
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the package and its API is fairly well documented in the "doc/" folder
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that should have come with this archive.
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Requirements
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------------
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- python 2.3 or better <http://www.python.org/>
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(python 2.2 is also supported, but not recommended)
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- pycrypto 2.1 or better <https://www.dlitz.net/software/pycrypto/>
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If you have setuptools, you can build and install paramiko and all its
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dependencies with this command (as root)::
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easy_install ./
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Portability
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-----------
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i code and test this library on Linux and MacOS X. for that reason, i'm
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pretty sure that it works for all posix platforms, including MacOS. it
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should also work on Windows, though i don't test it as frequently there.
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if you run into Windows problems, send me a patch: portability is important
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to me.
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python 2.2 may work, thanks to some patches from Roger Binns. things to
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watch out for:
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* sockets in 2.2 don't support timeouts, so the 'select' module is
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imported to do polling.
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* logging is mostly stubbed out. it works just enough to let paramiko
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create log files for debugging, if you want them. to get real logging,
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you can backport python 2.3's logging package. Roger has done that
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already:
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http://sourceforge.net/project/showfiles.php?group_id=75211&package_id=113804
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you really should upgrade to python 2.3. laziness is no excuse! :)
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some python distributions don't include the utf-8 string encodings, for
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reasons of space (misdirected as that is). if your distribution is
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missing encodings, you'll see an error like this::
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LookupError: no codec search functions registered: can't find encoding
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this means you need to copy string encodings over from a working system.
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(it probably only happens on embedded systems, not normal python
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installs.) Valeriy Pogrebitskiy says the best place to look is
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``.../lib/python*/encodings/__init__.py``.
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Bugs & Support
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--------------
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there's a launchpage page for paramiko, with a bug tracker:
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https://launchpad.net/paramiko/
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this is the primary place to file and browse bug reports.
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there's also a low-traffic mailing list for support and discussions:
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http://www.lag.net/mailman/listinfo/paramiko
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Demo
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----
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several demo scripts come with paramiko to demonstrate how to use it.
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probably the simplest demo of all is this::
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import paramiko, base64
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key = paramiko.RSAKey(data=base64.decodestring('AAA...'))
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client = paramiko.SSHClient()
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client.get_host_keys().add('ssh.example.com', 'ssh-rsa', key)
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client.connect('ssh.example.com', username='strongbad', password='thecheat')
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stdin, stdout, stderr = client.exec_command('ls')
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for line in stdout:
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print '... ' + line.strip('\n')
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client.close()
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...which prints out the results of executing ``ls`` on a remote server.
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(the host key 'AAA...' should of course be replaced by the actual base64
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encoding of the host key. if you skip host key verification, the
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connection is not secure!)
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the following example scripts (in demos/) get progressively more detailed:
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:demo_simple.py:
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calls invoke_shell() and emulates a terminal/tty through which you can
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execute commands interactively on a remote server. think of it as a
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poor man's ssh command-line client.
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:demo.py:
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same as demo_simple.py, but allows you to authenticiate using a
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private key, attempts to use an SSH-agent if present, and uses the long
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form of some of the API calls.
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:forward.py:
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command-line script to set up port-forwarding across an ssh transport.
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(requires python 2.3.)
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:demo_sftp.py:
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opens an sftp session and does a few simple file operations.
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:demo_server.py:
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an ssh server that listens on port 2200 and accepts a login for
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'robey' (password 'foo'), and pretends to be a BBS. meant to be a
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very simple demo of writing an ssh server.
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Use
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---
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the demo scripts are probably the best example of how to use this package.
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there is also a lot of documentation, generated with epydoc, in the doc/
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folder. point your browser there. seriously, do it. mad props to
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epydoc, which actually motivated me to write more documentation than i
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ever would have before.
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there are also unit tests here::
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$ python ./test.py
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which will verify that most of the core components are working correctly.
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