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\chapter{ssh}
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\label{chap:ssh}
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Secure Shell.
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D'après le site \texttt{openssh.org} :
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\textit{OpenSSH is a {\em free} version of the SSH\index{ssh} connectivity
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tools that technical users of the Internet rely on. Users of
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telnet, rlogin, and ftp\index{ftp} may not realize that their password
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is transmitted across the Internet unencrypted, but it
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is. OpenSSH encrypts all traffic (including passwords) to
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effectively eliminate eavesdropping, connection hijacking, and
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other attacks. Additionally, OpenSSH provides secure tunneling
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capabilities and several authentication methods, and supports
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all SSH protocol versions.}
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2021-10-04 22:24:01 +02:00
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% --------------------------------------------
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2021-10-04 22:24:01 +02:00
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\section{X11 forwarding}\index{X11}
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2021-10-04 22:24:01 +02:00
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Option \texttt{-X} et ses implications sur la sécurité.
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\section{sshfs}
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\index{sshfs}
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D'après la manpage Linux : \textit{SSHFS (Secure SHell FileSystem)
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is a file system for Linux (and other operating systems with a FUSE
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implementation, such as Mac OS X or FreeBSD) capable of operating
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on files on a remote computer using just a secure shell login on the
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remote computer. On the local computer where the SSHFS is mounted,
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the implementation makes use of the FUSE (Filesystem in Userspace)
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kernel module. The practical effect of this is that the end user can
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seamlessly interact with remote files being securely served over SSH
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just as if they were local files on his/her computer. On the remote
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computer the SFTP\index{sftp} subsystem of SSH is used.}
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Hélas, ça ne marche pas trop bien depuis un
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OpenBSD\index{OpenBSD}\footnote{OpenBSD 5.5 sur sparc64} :
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\begin{verbatim}
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~ $ uname -a
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OpenBSD vierge.thsf.net 5.5 GENERIC#159 sparc64
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~ $ sshfs tth@10.20.0.23:/tvbruits 23/
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fuse_mount: Permission denied
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\end{verbatim}
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Grace à \texttt{<semarie>}\footnote{du Groupuscule des Contributeurs
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d'Unix}\index{gcu} : pour un montage en
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tant que yuser il faut deux choses :
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les bons droits sur \texttt{/dev/fuse*} et un
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\texttt{sysctl kern.usermount=1} bien senti.
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La semaine prochaine, nous verrons le \textit{mapping} entre les
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UID\index{UID} locaux et distants.
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2021-10-04 22:24:01 +02:00
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% --------------------------------------------
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2021-10-04 22:24:01 +02:00
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\section{Port forwarding}
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2021-10-04 22:24:01 +02:00
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% https://tookmund.com/2021/10/ssh-port-forwarding
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