12.7.6 OpenSSH Configuration Files and Commands
sftp [@hostname]
sftp option that specifies the remote system
sftp [username]
sftp option that specifies the user account on the remote system
UsePAM
/etc/ssh/sshd_config option that enables the Pluggable Authentication Modules interface between sshd and the system
ListenAddress
/etc/ssh/sshd_config option that gives the addresses that SSH should use when listening for requests
AllowUsers
/etc/ssh/sshd_config option that lists users allowed to use SSH
DenyUsers
/etc/ssh/sshd_config option that lists users not allowed to use SSH; overrides AllowUsers entry
Protocol
/etc/ssh/sshd_config option that spcifies which protocols SSH allows when accessing the SSH server
Port
/etc/ssh/sshd_config option that specifies the port number
PermitRootLogin
/etc/ssh/sshd_config option that specifies whether users can log in as root over SSH
ssh [commands]
ssh option that runs the commands on the remote system but displays the results on the local machine
ssh [hostname]
ssh option that specifies the SSH server name and could include a domain name
ssh -l
ssh option that specifies the user account on the server
PasswordAuthentication
/etc/ssh/sshd_config option that disables password authentication when set to no
User
/etc/ssh/ssh_config or ~./ssh_config option that automatically logs in with the specified user name instead of requesting a username
StrictHostKeyChecking
/etc/ssh/ssh_config or ~./ssh_config option that determines whether SSH clients can accept keys from SSH server not previously accessed
Port
/etc/ssh/ssh_config or ~./ssh_config option that specifies the port that SSH uses
Protocol
/etc/ssh/ssh_config or ~./ssh_config option that specifies which protocols SSH allows when accessing the SSH server
CheckHostIP
/etc/ssh/ssh_config or ~./ssh_config option that verifies that the supplied key matches the IP address of the server when set to yes
slogin
command that allows access to a shell on a remote computer; identical to the ssh command; supported only for backwards compatibility
get [file_name]
command that copies a file from the ftp server
cdup
command that traverses up a directory
cat [keyfile].pub >> /etc/ssh/ssh_known_hosts
command to manually add new keys
scp
command used to encrypt and copy files from a remote system over the network
ssh
command used to make a secure conection from the SSH client to the SSH server; overrides entries in /etc/ssh/ssh_config and ~/.ssh/config files
service sshd
command used to manage the current state of the SSH daemon on the server
sftp
command used to transfer files securely from ftp servers
which
command used to verify if a package is installed on the system
/etc/ssh/ssh_config
file that configures OpenSSH for all users on the client system
/etc/ssh/sshd_config
files used to configure the SSH daemon on the server system
scp [destination/filename]
scp option that specifies the location and name of the new file
scp [@hostname:remotefile]
scp option that specifies the remote system and remote file
scp [username]
scp option that specifies the user account on the remote system
service sshd stop
service sshd option that halts a running daemon
service sshd status
service sshd option that shows the status of a single daemon
service sshd start
service sshd option that starts a daemon that is not currently running
service sshd restart
service sshd option that stops and restarts a daemon
~/.ssh_config
user-specific hidden file which can override the configuration in /etc/ssh/ssh_config
/etc/ssh/ssh_known_hosts or ~/.ssh/known_hosts
where the keys of previously accessed servers are stored
