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This page is about OpenSSH client configuration. For OpenSSH server configuration, see. For Tectia SSH configuration, see. For configuring passwordless public key authentication, see.The program on a host receives its configuration from either the command line or from configuration files /.ssh/config and /etc/ssh/sshconfig.options take precedence over configuration files. The user-specific configuration file /.ssh/config is used next. Finally, the global /etc/ssh/sshconfig file is used. The first obtained value for each configuration parameter will be used.
Contents Commonly used configuration optionsThere are many configuration options available. In practice, only a few of them are ever changed, and user-specific configuration files are rarely used. In most cases, just /etc/ssh/sshconfig is edited.
Enabling X11 forwarding and agent forwardingDevelopers, students, and researchers often want to enable X11 forwarding and SSH agent forwarding. These allow running graphical applications remotely and eliminate the need for typing a password whenever moving from one server to another, respectively. Setting these options in /etc/ssh/sshconfig makes life easier for end users, saves overhead, and reduces support load. However, they increase the risk of an attack spreading from a compromised server to a user's desktop, so the most security-critical environments may want to leave them disabled.
There is generally no reason to enable them on production servers in enterprises. ForwardAgent yesForwardX11 yes Port forwardingLocal and remote port forwarding can be used for tunneling applications, accessing intranet web services from home, tunneling database access, and many other purposes. For instructions on configuring port forwarding, see the.
Note, however, that port forwarding can also be used to tunnel traffic from the external Internet into a corporate intranet. Employees sometimes do this to be able to work from home even when company policy does not permit it.
Hackers use it to leave permanent backdoor. See the page on for more information. Configuring public key authenticationPublic authentication is used for passwordless logins between systems. It is often used for automated processes, such as backups, configuration management, and file transfers.
It is also used by sophisticated end users and system administrators for single sign-on. See the for configuring it.When a user has created more than one for authentication, the -i command line option may be helpful for specifying which key to use. In the client configuration file, this can be specified using the IdentityFile options.
Certificate-based authenticationOpenSSH certificates can be used for authentication either using or by specifying the CertificateFile option in the client configuration file. See for more information. Format of SSH client config file sshconfigThe sshconfig client configuration file has the following format.
Both the global /etc/ssh/sshconfig and per-user /ssh/config have the same format.Empty lines and lines starting with '#' are comments.Each line begins with a keyword, followed by argument(s).Configuration options may be separated by whitespace or optional whitespace and exactly one =.Arguments may be enclosed in double quotes (') in order to specify arguments that contain spaces.Listing of client configuration optionsThe following keywords can be used in SSH client configuration files. Keywords are case-insensitive and arguments are case-sensitive. Any algorithm or method names that include an at sign (@) are for experimental use only and not recommended for production.HostRestricts the following declarations to be only for those hosts that match one of the patterns given after the keyword. The pattern is matched against the host name given on the command line.MatchRestricts the following declarations to apply only for hosts that match the specified criteria. For detailed information, see.AddressFamilySpecifies which address family to use when connecting. Valid arguments are: any, inet, inet6.BatchModeIf set to yes, passphrase/password querying will be disabled.
This is useful for running the ssh client from shell script that do not have an interactive user, and prevents accidentally blocking on a password prompt.BindAddressSpecifies to use the specified address on the local machine as the source address of the connection.ChallengeResponseAuthenticationSpecifies whether to use challenge-response authentication. This is mostly a legacy method and has been replaced by KbdInteractiveAuthentication.CheckHostIPDirects ssh to additionally check the host IP address in the knownhosts file.CipherSpecifies the cipher to use for encrypting the session in protocol version 1. Note that use of protocol 1 is not recommended.CiphersSpecifies the ciphers allowed for protocol version 2 in order of preference. Multiple ciphers must be comma-separated.
The ssh -Q cipher command can be used to query supported ciphers. The following list is supported in 6.7: 3des-cbcblowfish-cbccast128-cbcarcfourarcfour128arcfour256aes128-cbcaes192-cbcaes256-cbcrijndael-cbc@lysator.liu.seaes128-ctraes192-ctraes256-ctraes128-gcm@[email protected]@openssh.comClearAllForwardingsSpecifies that all local, remote, and dynamic port forwardings specified in the configuration files or on the command line be cleared.CompressionSpecifies whether to use compression.
Description of SSH Config Editor Pro 1.11.5
SSH Config Editor Pro 1.11.5 is a handy tool for manage your OpenSSH ssh client configuration file. You can add or edit identity files, port forwardings (with handy graphical preview) and any other ssh config option.
Features
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