SSH - Session (Login)

Articles Related

Login Process

For sshd. See sshd

When a user successfully logs in, sshd does the following:

• If the login is on a tty, and no command has been specified, prints:
  • last login time
  • and /etc/motd (unless prevented in the configuration file or by ~/.hushlogin).
• If the login is on a tty, records login time.
• Checks /etc/nologin; if it exists, prints contents and quits (unless root).
• Changes to run with normal user privileges.
• Sets up basic environment.
• Reads the file ~/.ssh/environment, if it exists, and users are allowed to change their environment. See the PermitUserEnvironmentoption in sshd_config
• Changes to user's home directory.
• If ~/.ssh/rc exists and the sshd_config(5) PermitUserRC option is set, runs it; else if /etc/ssh/sshrc exists, runs it; otherwise runs xauth. The “rc” files are given the X11 authentication protocol and cookie in standard input. See SSHRC, below.
• Runs user's shell or command. All commands are run under the user's login shell as specified in the system password database.