公钥认证的bash / SSH测试 [英] bash/ssh test for public key authentication

问题描述

有没有一种方法以编程方式测试SSH是否能够使用公钥验证？我愿做这样的事情（preferably在bash，但我开到一个python溶液）：

Is there a way to programmatically test whether ssh can authenticate using a public key? I would like to do something like this (preferably in bash, but am open to a python solution):

ssh-test-thingy user@host || echo "could not authenticate using publickey"

其中， SSH-测试啄返回一个非零退出状态，如果在远程主机上没有公钥匹配。

where ssh-test-thingyreturns a non-zero exit status if no public key matches on the remote host.

推荐答案

我想通过选项 -o批处理模式= YES 来ssh和看看是否能工程。这将禁用提示输入密码，我想这是在实践中等同于你的愿望，以找出是否通过密钥验证是可能的。 SSH-测试啄可以写成像这样一个bash脚本：

I'd pass the option -o BatchMode=yes to ssh and see if that works. It will disable prompting for a password, which I think is equivalent in practice to your desire to find out if authentication via keys is possible. ssh-test-thingy could be written as a bash script like so:

exec ssh -o BatchMode=yes "$@" true

这只会转嫁给用户@主机（以及任何其他参数），并尝试运行真正远程主机，如果它的工作将立即返回其上成功的状态code（0）。

This will simply pass the user@host (and any other arguments) along, and try to run true on the remote host, which if it works will immediately return a status code of success (0).

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