Perform SSH and SCP Without Entering Password on openSSH. In this article, I’ll explain how to perform ssh and scp without entering the password using the SSH Public Key authentication with SSH Agent on openSSH There are two levels of security in the SSH key based authentication. In order for you to login, you need both the private key and the passphrase.
Even if one of them is compromised, attacker still cannot login to your account, as both of them are needed to login. This is far better than typical password based authentication, where if the password is compromised, attacker can gain access to the system. There are two ways to perform ssh and scp without entering the password: No passphrase. Following 8 steps explains how to perform SSH and SCP from local-host to a remote-host without entering the password on openSSH system 1. [local-host]$ ssh -V OpenSSH_4.3p2, OpenSSL 0.9.8b 04 May 2006 [remote-host]$ ssh -V OpenSSH_4.3p2, OpenSSL 0.9.8b 04 May 2006 2. [local-host]$ ssh-keygen Generating public/private rsa key pair. 3. 4. 5. 6. 7. 8. Manpage of SSHD. Directory permissions in chroot SFTP | OpenSSH | Dev. OpenSSH SFTP chroot() with ChrootDirectory.
Posted by niol on Tue 1 Apr 2008 at 10:49 The upcoming version of OpenSSH ( 4.8p1 for the GNU/Linux port) features a new configuration option : ChrootDirectory . This has been made possible by a new SFTP subsystem statically linked to sshd . This makes it easy to replace a basic FTP service without the hassle of configuring encryption and/or bothering with FTP passive and active modes when operating through a NAT router.
This is also simpler than packages such as rssh , scponly or other patches because it does not require setting up and maintaining (i.e. security updates) a chroot environment. To enable it, you obviously need the new version 4.8p1 . I personaly use the cvs version and the debian/ directory of the sid package to build a well integrated Debian package 4.8p1~cvs-1 . In /etc/ssh/sshd_config : You need to configure OpenSSH to use its internal SFTP subsystem. Subsystem sftp internal-sftp Then, I configured chroot() ing in a match rule. This seems to work as expected : References :
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