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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.
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Hi, I configured openssh 5.1p1 for sftp server. Here the specifications in sshd_config file: Subsystem sftp internal-sftp Match Group sftp ForceCommand internal-sftp ChrootDirectory /home/%u AllowTcpForwarding no When a user is logged in, he can't upload his document and he receives this message: carlo [at] Musi:~$ sftp user [at] 213 Connecting to 126.96.36.199... user [at] 213's password: sftp> put prova Uploading prova to /prova Couldn't get handle: Permission denied sftp> Here the directory permissions:
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.
Consider a scenario, where a user needs to connect to the server via sftp and should restrict the access only to its home directory. The OpenSSH-4.x does not support chrooting facility. We need to upgrade it to OpenSSH-5.x. Before upgrading openssh, we need to make sure that pam, openssl and kerberos packages are installed. If not, run the following command to install it. $ rpm -qa | grep -e openssl -e krb -e openssh openssh-clients-4.3p2-36.el5_4.4 openssh-server-4.3p2-36.el5_4.4 krb5-devel-1.6.1-36.el5_4.1 openssl-0.9.8e-7.el5 openssl-devel-0.9.8e-7.el5 openssh-4.3p2-36.el5_4.4 krb5-libs-1.6.1-36.el5_4.1
For regular user accounts, a properly configured chroot jail is a rock solid security system. I've already written about chrooting sftp session using rssh . According to OpenBSD journal OpenSSH devs Damien Miller and Markus Friedl have recently added a chroot security feature to openssh itself: Unfortunately, setting up a chroot(2) environment is complicated, fragile and annoying to maintain.