You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
118 lines
4.3 KiB
118 lines
4.3 KiB
\documentclass[11pt]{article}
|
|
%Gummi|065|=)
|
|
\title{\textbf{AutoSSH - a Reverse Proxy Alternative}}
|
|
\usepackage{xcolor}
|
|
\usepackage[vcentering,dvips]{geometry}
|
|
\geometry{papersize={6in,9in},total={4.5in,6.8in}}
|
|
\usepackage{graphicx}
|
|
\usepackage{caption }
|
|
\author{Steak Electronics}
|
|
\date{06/4/19}
|
|
\begin{document}
|
|
|
|
%\maketitle
|
|
\textbf{AutoSSH - a Reverse Proxy Alternative}
|
|
|
|
\vspace{0.2in}
|
|
This document is best read printed out on paper.
|
|
%\textbf{Todo}
|
|
\textcolor{green!60!blue!70}{
|
|
\section{Overview}}
|
|
I recently added another apache server to an existing infrastructure, and I wanted it to be accessible under a similar IP as another server. Due to the complexity of the website, it was not possible to simply do a reverse proxy without knowing the correct settings (e.g. X-Forwarded for). Instead, AutoSSH was used.
|
|
|
|
\textcolor{green!60!blue!70}{
|
|
\section{Work Log}}
|
|
Ok, I'm going to get right to the configs that I used. You want the tool, you don't need to know all the details.
|
|
|
|
\textcolor{green!60!blue!70}{
|
|
\subsection{Crontab}}
|
|
Here is the crontab script I used. I put this in /etc/crontab, so it has root after the times. I only use /etc/crontab, as it's easier to manage.
|
|
\begin{verbatim}
|
|
* * * * * root pgrep autossh > /dev/null || \
|
|
/usr/local/bin/autosshzm/autosshzm.sh
|
|
\end{verbatim}
|
|
A few notes about this. Pgrep will search for autossh. If it doesn't find it, then it will try the next command. (|| is an OR). Put the bash script wherever you want.
|
|
|
|
\textcolor{green!60!blue!70}{
|
|
\subsection{Bash Script}}
|
|
|
|
This script is obviously what the crontab calls.
|
|
\begin{verbatim}
|
|
#!/bin/bash
|
|
logger " /usr/local/bin/autosshzm script started."
|
|
#source $HOME/.bash_profile #not needed.
|
|
source $HOME/.keychain/$HOSTNAME-sh
|
|
logger " /usr/local/bin/autosshzm sourced."
|
|
|
|
autossh -L 0.0.0.0:2:localhost:80 -f user@ipaddress sleep 31536000
|
|
&> /var/log/autosshzm/autosshzm.log
|
|
#autossh -M 0 -o "ServerAliveInterval 30" -o "ServerAliveCountMax 3"
|
|
-L 0.0.0.0:2:localhost:80 user@ipaddress &>
|
|
/var/log/autosshzm/autosshzm.log
|
|
logger "auto ssh ran"
|
|
\end{verbatim}
|
|
Note that the second autossh does not work, as it's missing the sleep and the -f command. \footnote{Figuring this kind of stuff out can take about an hour.} In order for this to work, you'll also need the following commands:
|
|
|
|
\begin{verbatim}
|
|
apt-get install keychain autossh
|
|
\end{verbatim}
|
|
There were some more setup steps required for keychain...
|
|
From stackexchange:
|
|
\begin{verbatim}
|
|
25
|
|
keychain
|
|
solves this in a painless way. It's in the repos for Debian/Ubuntu:
|
|
|
|
sudo apt-get install keychain
|
|
|
|
and perhaps for many other distros (it looks like it originated
|
|
from Gentoo).
|
|
|
|
This program will start an ssh-agent if none is running, and
|
|
provide shell scripts that can be sourced and connect the current
|
|
shell to this particular ssh-agent.
|
|
|
|
For bash, with a private key named id_rsa, add the following to
|
|
your .profile:
|
|
|
|
keychain --nogui id_rsa
|
|
|
|
This will start an ssh-agent and add the id_rsa key on the first
|
|
login after reboot. If the key is passphrase-protected, it will
|
|
also ask for the passphrase. No need to use unprotected keys
|
|
anymore! For subsequent logins, it will recognize the agent
|
|
and not ask for a passphrase again.
|
|
|
|
Also, add the following as a last line of your .bashrc:
|
|
|
|
. ~/.keychain/$HOSTNAME-sh
|
|
|
|
This will let the shell know where to reach the SSH agent managed
|
|
by keychain. Make sure that .bashrc is sourced from .profile.
|
|
|
|
However, it seems that cron jobs still don't see this. As a
|
|
remedy, include the line above in the crontab, just before
|
|
your actual command:
|
|
|
|
* * * * * . ~/.keychain/$HOSTNAME-sh; your-actual-command
|
|
|
|
|
|
\end{verbatim}
|
|
The only thing that I needed to do here was
|
|
|
|
keychain --nogui id\_rsa
|
|
|
|
The rest of it (notes about crontab) was not required.
|
|
|
|
\textcolor{green!60!blue!70}{
|
|
\section{What Did NOT Work}}
|
|
Here's some things I tried that did not work.
|
|
\begin{itemize}
|
|
\item https://github.com/obfusk/autossh-init - This init script, didn't do much for me. Remember, I'm stuck with systemd in Ubuntu 19.04...\footnote{The scourge of deleting software history. Keep backwards compatibility at ALL COSTS, developers.}
|
|
\item Reverse proxy with Apache - As I said, my website \footnote{Some people might call it a web application. I will not.} was too complex, and I didn't want to go down that rabbit hole.
|
|
\item Starting AutoSSH in rc.local. Didn't work.
|
|
|
|
\end{itemize}
|
|
|
|
|
|
\end{document}
|