![]() So legacy SSH-1 SFTP clients have the sftp-server name hard-coded. An SFTP client using SSH-1 tells the server explicitly, what binary the server should run. Using the sftp-server binary (being a standalone process) you can use some hacks, like running the SFTP under sudo.įor SSH-1 (if anyone is still using it), Subsystem directive is not involved at all. Switching to the internal-sftp would bypass the restriction, as the login shell is no longer involved. But there are edge cases, where there are differences.Īdministrator may rely on a login shell configuration to prevent certain users from logging in. It may seem that the sshd could automatically use the internal-sftp, when it encounters the sftp-server, as the functionality is identical and the internal-sftp has even the above advantages. For file transfer sessions using SFTP no additional configuration of the environment is necessary if the in-process sftp-server is used, though sessions which use logging may require /dev/log inside the chroot directory on some operating systems (see sftp-server for details).Īnother advantage of the internal-sftp is a performance, as it's not necessary to run a new sub-process for it. For an interactive session this requires at least a shell, typically sh, and basic /dev nodes such as null, zero, stdin, stdout, stderr, and tty devices. The ChrootDirectory must contain the necessary files and directories to support the user's session. Specifying a command of internal-sftp will force the use of an in-process SFTP server that requires no support files when used with ChrootDirectory. This may simplify configurations using ChrootDirectory to force a different filesystem root on clients. The command sftp-server implements the SFTP file transfer subsystem.Īlternately the name internal-sftp implements an in-process SFTP server. The main advantage of the internal-sftp is, that it requires no support files when used with ChrootDirectory directive. They are built from the same source code. Son las siglas de SSH File Transfer Protocol y consiste en una extensión de Secure Shell Protocol (SSH) creada para poder hacer transmisiones de archivos. I believe there's no reason to use the sftp-server for new installations.įrom a functional point of view, the sftp-server and internal-sftp are almost identical. The sftp-server, which is now redundant and is kept probably for backward compatibility. But it is used in the default configuration file now. The internal-sftp was added much later (OpenSSH 4.9p1 in 2008?) than the standalone sftp-server binary. The internal-sftp is just a configuration keyword that tells sshd to use the SFTP server code built-into the sshd, instead of running another process (what would typically be the sftp-server). Last week they switched to Office 365 mail, and I was able to get the plugin to send through. Both sftp-server and internal-sftp are part of OpenSSH. I have a client who has been sending SMTP emails via the plugin for years without issue.
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