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SSH_CONFIG(5)		    BSD File Formats Manual		 SSH_CONFIG(5)

NAME

ssh_config - OpenSSH SSH client configuration files

SYNOPSIS

~/.ssh/config /etc/ssh/ssh_config

DESCRIPTION

ssh obtains configuration data from the following sources in the follow- ing order: 1. command-line options 2. user's configuration file (~/.ssh/config) 3. system-wide configuration file (/etc/ssh/ssh_config) For each parameter, the first obtained value will be used. The configu- ration files contain sections separated by "Host" specifications, and that section is only applied for hosts that match one of the patterns given in the specification. The matched host name is the one given on the command line. Since the first obtained value for each parameter is used, more host-spe- cific declarations should be given near the beginning of the file, and general defaults at the end. The configuration file has the following format: Empty lines and lines starting with '#' are comments. Otherwise a line is of the format "keyword arguments". Configuration options may be separated by whitespace or optional whitespace and exactly one '='; the latter format is useful to avoid the need to quote whites- pace when specifying configuration options using the ssh, scp and sftp -o option. The possible keywords and their meanings are as follows (note that key- words are case-insensitive and arguments are case-sensitive): Host Restricts the following declarations (up to the next Host key- word) to be only for those hosts that match one of the patterns given after the keyword. '*' and '?' can be used as wildcards in the patterns. A single '*' as a pattern can be used to provide global defaults for all hosts. The host is the hostname argument given on the command line (i.e., the name is not converted to a canonicalized host name before matching). AddressFamily Specifies which address family to use when connecting. Valid arguments are "any", "inet" (use IPv4 only) or "inet6" (use IPv6 only). BatchMode If set to "yes", passphrase/password querying will be disabled. This option is useful in scripts and other batch jobs where no user is present to supply the password. The argument must be "yes" or "no". The default is "no". BindAddress Use the specified address on the local machine as the source address of the connection. Only useful on systems with more than one address. Note that this option does not work if UsePrivilegedPort is set to "yes". ChallengeResponseAuthentication Specifies whether to use challenge response authentication. The argument to this keyword must be "yes" or "no". The default is "yes". CheckHostIP If this flag is set to "yes", ssh will additionally check the host IP address in the known_hosts file. This allows ssh to detect if a host key changed due to DNS spoofing. If the option is set to "no", the check will not be executed. The default is "yes". Cipher Specifies the cipher to use for encrypting the session in proto- col version 1. Currently, "blowfish", "3des", and "des" are sup- ported. des is only supported in the ssh client for interoper- ability with legacy protocol 1 implementations that do not sup- port the 3des cipher. Its use is strongly discouraged due to cryptographic weaknesses. The default is "3des". Ciphers Specifies the ciphers allowed for protocol version 2 in order of preference. Multiple ciphers must be comma-separated. The sup- ported ciphers are "3des-cbc", "aes128-cbc", "aes192-cbc", "aes256-cbc", "aes128-ctr", "aes192-ctr", "aes256-ctr", "arcfour128", "arcfour256", "arcfour", "blowfish-cbc", and "cast128-cbc". The default is ''aes128-ctr,aes192-ctr,aes256-ctr,arcfour256,arcfour128, aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,aes192-cbc, aes256-cbc,arcfour'' ClearAllForwardings Specifies that all local, remote and dynamic port forwardings specified in the configuration files or on the command line be cleared. This option is primarily useful when used from the ssh command line to clear port forwardings set in configuration files, and is automatically set by scp(1) and sftp(1). The argu- ment must be "yes" or "no". The default is "no". Compression Specifies whether to use compression. The argument must be "yes" or "no". The default is "no". CompressionLevel Specifies the compression level to use if compression is enabled. The argument must be an integer from 1 (fast) to 9 (slow, best). The default level is 6, which is good for most applications. The meaning of the values is the same as in gzip(1). Note that this option applies to protocol version 1 only. ConnectionAttempts Specifies the number of tries (one per second) to make before exiting. The argument must be an integer. This may be useful in scripts if the connection sometimes fails. The default is 1. ConnectTimeout Specifies the timeout (in seconds) used when connecting to the ssh server, instead of using the default system TCP timeout. This value is used only when the target is down or really unreachable, not when it refuses the connection. ControlMaster Enables the sharing of multiple sessions over a single network connection. When set to "yes" ssh will listen for connections on a control socket specified using the ControlPath argument. Addi- tional sessions can connect to this socket using the same ControlPath with ControlMaster set to "no" (the default). These sessions will try to reuse the master instance's network connec- tion rather than initiating new ones, but will fall back to con- necting normally if the control socket does not exist, or is not listening. Setting this to "ask" will cause ssh to listen for control con- nections, but require confirmation using the SSH_ASKPASS program before they are accepted (see ssh-add(1) for details). If the ControlPath can not be opened, ssh will continue without connect- ing to a master instance. X11 and ssh-agent(1) forwarding is supported over these multi- plexed connections, however the display and agent forwarded will be the one belonging to the master connection i.e. it is not pos- sible to forward multiple displays or agents. Two additional options allow for opportunistic multiplexing: try to use a master connection but fall back to creating a new one if one does not already exist. These options are: "auto" and "autoask". The latter requires confirmation like the "ask" option. ControlPath Specify the path to the control socket used for connection shar- ing as described in the ControlMaster section above or the string "none" to disable connection sharing. In the path, '%h' will be substituted by the target host name, '%p' the port and '%r' by the remote login username. It is recommended that any ControlPath used for opportunistic connection sharing include all three of these escape sequences. This ensures that shared con- nections are uniquely identified. DynamicForward Specifies that a TCP port on the local machine be forwarded over the secure channel, and the application protocol is then used to determine where to connect to from the remote machine. The argument must be [bind_address:]port. IPv6 addresses can be specified by enclosing addresses in square brackets or by using an alternative syntax: [bind_address/]port. By default, the local port is bound in accordance with the GatewayPorts setting. However, an explicit bind_address may be used to bind the connec- tion to a specific address. The bind_address of "localhost" indicates that the listening port be bound for local use only, while an empty address or '*' indicates that the port should be available from all interfaces. Currently the SOCKS4 and SOCKS5 protocols are supported, and ssh will act as a SOCKS server. Multiple forwardings may be speci- fied, and additional forwardings can be given on the command line. Only the superuser can forward privileged ports. EnableSSHKeysign Setting this option to "yes" in the global client configuration file /etc/ssh/ssh_config enables the use of the helper program ssh-keysign(8) during HostbasedAuthentication. The argument must be "yes" or "no". The default is "no". This option should be placed in the non-hostspecific section. See ssh-keysign(8) for more information. EscapeChar Sets the escape character (default: '~'). The escape character can also be set on the command line. The argument should be a single character, '^' followed by a letter, or "none" to disable the escape character entirely (making the connection transparent for binary data). ForwardAgent Specifies whether the connection to the authentication agent (if any) will be forwarded to the remote machine. The argument must be "yes" or "no". The default is "no". Agent forwarding should be enabled with caution. Users with the ability to bypass file permissions on the remote host (for the agent's Unix-domain socket) can access the local agent through the forwarded connection. An attacker cannot obtain key material from the agent, however they can perform operations on the keys that enable them to authenticate using the identities loaded into the agent. ForwardX11 Specifies whether X11 connections will be automatically redi- rected over the secure channel and DISPLAY set. The argument must be "yes" or "no". The default is "no". X11 forwarding should be enabled with caution. Users with the ability to bypass file permissions on the remote host (for the user's X11 authorization database) can access the local X11 dis- play through the forwarded connection. An attacker may then be able to perform activities such as keystroke monitoring if the ForwardX11Trusted option is also enabled. ForwardX11Trusted If this option is set to "yes" then remote X11 clients will have full access to the original X11 display. If this option is set to "no" then remote X11 clients will be considered untrusted and prevented from stealing or tampering with data belonging to trusted X11 clients. Furthermore, the xauth(1) token used for the session will be set to expire after 20 minutes. Remote clients will be refused access after this time. The default is "no". See the X11 SECURITY extension specification for full details on the restrictions imposed on untrusted clients. GatewayPorts Specifies whether remote hosts are allowed to connect to local forwarded ports. By default, ssh binds local port forwardings to the loopback address. This prevents other remote hosts from con- necting to forwarded ports. GatewayPorts can be used to specify that ssh should bind local port forwardings to the wildcard address, thus allowing remote hosts to connect to forwarded ports. The argument must be "yes" or "no". The default is "no". GlobalKnownHostsFile Specifies a file to use for the global host key database instead of /etc/ssh/ssh_known_hosts. GSSAPIAuthentication Specifies whether user authentication based on GSSAPI is allowed. The default is "no". Note that this option applies to protocol version 2 only. GSSAPIDelegateCredentials Forward (delegate) credentials to the server. The default is "no". Note that this option applies to protocol version 2 only. HashKnownHosts Indicates that ssh should hash host names and addresses when they are added to ~/.ssh/known_hosts. These hashed names may be used normally by ssh and sshd, but they do not reveal identifying information should the file's contents be disclosed. The default is "no". Note that hashing of names and addresses will not be retrospectively applied to existing known hosts files, but these may be manually hashed using ssh-keygen(1). HostbasedAuthentication Specifies whether to try rhosts based authentication with public key authentication. The argument must be "yes" or "no". The default is "no". This option applies to protocol version 2 only and is similar to RhostsRSAAuthentication. HostKeyAlgorithms Specifies the protocol version 2 host key algorithms that the client wants to use in order of preference. The default for this option is: "ssh-rsa,ssh-dss". HostKeyAlias Specifies an alias that should be used instead of the real host name when looking up or saving the host key in the host key database files. This option is useful for tunneling ssh connec- tions or for multiple servers running on a single host. HostName Specifies the real host name to log into. This can be used to specify nicknames or abbreviations for hosts. Default is the name given on the command line. Numeric IP addresses are also permitted (both on the command line and in HostName specifica- tions). IdentitiesOnly Specifies that ssh should only use the authentication identity files configured in the ssh_config files, even if the ssh-agent offers more identities. The argument to this keyword must be "yes" or "no". This option is intended for situations where ssh-agent offers many different identities. The default is "no". IdentityFile Specifies a file from which the user's RSA or DSA authentication identity is read. The default is ~/.ssh/identity for protocol version 1, and ~/.ssh/id_rsa and ~/.ssh/id_dsa for protocol ver- sion 2. Additionally, any identities represented by the authen- tication agent will be used for authentication. The file name may use the tilde syntax to refer to a user's home directory. It is possible to have multiple identity files specified in configu- ration files; all these identities will be tried in sequence. KbdInteractiveDevices Specifies the list of methods to use in keyboard-interactive authentication. Multiple method names must be comma-separated. The default is to use the server specified list. LocalCommand Specifies a command to execute on the local machine after suc- cessfully connecting to the server. The command string extends to the end of the line, and is executed with /bin/sh. This directive is ignored unless PermitLocalCommand has been enabled. LocalForward Specifies that a TCP port on the local machine be forwarded over the secure channel to the specified host and port from the remote machine. The first argument must be [bind_address:]port and the second argument must be host:hostport. IPv6 addresses can be specified by enclosing addresses in square brackets or by using an alternative syntax: [bind_address/]port and host/hostport. Multiple forwardings may be specified, and additional forwardings can be given on the command line. Only the superuser can forward privileged ports. By default, the local port is bound in accor- dance with the GatewayPorts setting. However, an explicit bind_address may be used to bind the connection to a specific address. The bind_address of "localhost" indicates that the lis- tening port be bound for local use only, while an empty address or '*' indicates that the port should be available from all interfaces. LogLevel Gives the verbosity level that is used when logging messages from ssh. The possible values are: QUIET, FATAL, ERROR, INFO, VER- BOSE, DEBUG, DEBUG1, DEBUG2 and DEBUG3. The default is INFO. DEBUG and DEBUG1 are equivalent. DEBUG2 and DEBUG3 each specify higher levels of verbose output. MACs Specifies the MAC (message authentication code) algorithms in order of preference. The MAC algorithm is used in protocol ver- sion 2 for data integrity protection. Multiple algorithms must be comma-separated. The default is "hmac-md5,hmac-sha1,hmac-ripemd160,hmac-sha1-96,hmac-md5-96". NoHostAuthenticationForLocalhost This option can be used if the home directory is shared across machines. In this case localhost will refer to a different machine on each of the machines and the user will get many warn- ings about changed host keys. However, this option disables host authentication for localhost. The argument to this keyword must be "yes" or "no". The default is to check the host key for localhost. NumberOfPasswordPrompts Specifies the number of password prompts before giving up. The argument to this keyword must be an integer. Default is 3. PasswordAuthentication Specifies whether to use password authentication. The argument to this keyword must be "yes" or "no". The default is "yes". PermitLocalCommand Allow local command execution via the LocalCommand option or using the !command escape sequence in ssh(1). The argument must be "yes" or "no". The default is "no". Port Specifies the port number to connect on the remote host. Default is 22. PreferredAuthentications Specifies the order in which the client should try protocol 2 authentication methods. This allows a client to prefer one method (e.g. keyboard-interactive) over another method (e.g. password) The default for this option is: "hostbased,publickey,keyboard-interactive,password". Protocol Specifies the protocol versions ssh should support in order of preference. The possible values are "1" and "2". Multiple ver- sions must be comma-separated. The default is "2,1". This means that ssh tries version 2 and falls back to version 1 if version 2 is not available. ProxyCommand Specifies the command to use to connect to the server. The com- mand string extends to the end of the line, and is executed with /bin/sh. In the command string, '%h' will be substituted by the host name to connect and '%p' by the port. The command can be basically anything, and should read from its standard input and write to its standard output. It should eventually connect an sshd(8) server running on some machine, or execute sshd -i some- where. Host key management will be done using the HostName of the host being connected (defaulting to the name typed by the user). Setting the command to "none" disables this option entirely. Note that CheckHostIP is not available for connects with a proxy command. This directive is useful in conjunction with nc(1) and its proxy support. For example, the following directive would connect via an HTTP proxy at 192.0.2.0: ProxyCommand /usr/bin/nc -X connect -x 192.0.2.0:8080 %h %p PubkeyAuthentication Specifies whether to try public key authentication. The argument to this keyword must be "yes" or "no". The default is "yes". This option applies to protocol version 2 only. RekeyLimit Specifies the maximum amount of data that may be transmitted before the session key is renegotiated. The argument is the num- ber of bytes, with an optional suffix of 'K', 'M', or 'G' to indicate Kilobytes, Megabytes, or Gigabytes, respectively. The default is between "1G" and "4G", depending on the cipher. This option applies to protocol version 2 only. RemoteForward Specifies that a TCP port on the remote machine be forwarded over the secure channel to the specified host and port from the local machine. The first argument must be [bind_address:]port and the second argument must be host:hostport. IPv6 addresses can be specified by enclosing addresses in square brackets or by using an alternative syntax: [bind_address/]port and host/hostport. Multiple forwardings may be specified, and additional forwardings can be given on the command line. Only the superuser can forward privileged ports. If the bind_address is not specified, the default is to only bind to loopback addresses. If the bind_address is '*' or an empty string, then the forwarding is requested to listen on all inter- faces. Specifying a remote bind_address will only succeed if the server's GatewayPorts option is enabled (see sshd_config(5)). RhostsRSAAuthentication Specifies whether to try rhosts based authentication with RSA host authentication. The argument must be "yes" or "no". The default is "no". This option applies to protocol version 1 only and requires ssh to be setuid root. RSAAuthentication Specifies whether to try RSA authentication. The argument to this keyword must be "yes" or "no". RSA authentication will only be attempted if the identity file exists, or an authentication agent is running. The default is "yes". Note that this option applies to protocol version 1 only. SendEnv Specifies what variables from the local environ(7) should be sent to the server. Note that environment passing is only supported for protocol 2, the server must also support it, and the server must be configured to accept these environment variables. Refer to AcceptEnv in sshd_config(5) for how to configure the server. Variables are specified by name, which may contain the wildcard characters '*' and '?'. Multiple environment variables may be separated by whitespace or spread across multiple SendEnv direc- tives. The default is not to send any environment variables. ServerAliveCountMax Sets the number of server alive messages (see below) which may be sent without ssh receiving any messages back from the server. If this threshold is reached while server alive messages are being sent, ssh will disconnect from the server, terminating the ses- sion. It is important to note that the use of server alive mes- sages is very different from TCPKeepAlive (below). The server alive messages are sent through the encrypted channel and there- fore will not be spoofable. The TCP keepalive option enabled by TCPKeepAlive is spoofable. The server alive mechanism is valu- able when the client or server depend on knowing when a connec- tion has become inactive. The default value is 3. If, for example, ServerAliveInterval (see below) is set to 15, and ServerAliveCountMax is left at the default, if the server becomes unresponsive ssh will disconnect after approximately 45 seconds. ServerAliveInterval Sets a timeout interval in seconds after which if no data has been received from the server, ssh will send a message through the encrypted channel to request a response from the server. The default is 0, indicating that these messages will not be sent to the server. This option applies to protocol version 2 only. SmartcardDevice Specifies which smartcard device to use. The argument to this keyword is the device ssh should use to communicate with a smart- card used for storing the user's private RSA key. By default, no device is specified and smartcard support is not activated. StrictHostKeyChecking If this flag is set to "yes", ssh will never automatically add host keys to the ~/.ssh/known_hosts file, and refuses to connect to hosts whose host key has changed. This provides maximum pro- tection against trojan horse attacks, however, can be annoying when the /etc/ssh/ssh_known_hosts file is poorly maintained, or connections to new hosts are frequently made. This option forces the user to manually add all new hosts. If this flag is set to "no", ssh will automatically add new host keys to the user known hosts files. If this flag is set to "ask", new host keys will be added to the user known host files only after the user has con- firmed that is what they really want to do, and ssh will refuse to connect to hosts whose host key has changed. The host keys of known hosts will be verified automatically in all cases. The argument must be "yes", "no" or "ask". The default is "ask". TCPKeepAlive Specifies whether the system should send TCP keepalive messages to the other side. If they are sent, death of the connection or crash of one of the machines will be properly noticed. However, this means that connections will die if the route is down tem- porarily, and some people find it annoying. The default is "yes" (to send TCP keepalive messages), and the client will notice if the network goes down or the remote host dies. This is important in scripts, and many users want it too. To disable TCP keepalive messages, the value should be set to "no". Tunnel Request starting tun(4) device forwarding between the client and the server. This option also allows requesting layer 2 (ether- net) instead of layer 3 (point-to-point) tunneling from the server. The argument must be "yes", "point-to-point", "ethernet" or "no". The default is "no". TunnelDevice Force a specified tun(4) device on the client. Without this option, the next available device will be used. UsePrivilegedPort Specifies whether to use a privileged port for outgoing connec- tions. The argument must be "yes" or "no". The default is "no". If set to "yes" ssh must be setuid root. Note that this option must be set to "yes" for RhostsRSAAuthentication with older servers. User Specifies the user to log in as. This can be useful when a dif- ferent user name is used on different machines. This saves the trouble of having to remember to give the user name on the com- mand line. UserKnownHostsFile Specifies a file to use for the user host key database instead of ~/.ssh/known_hosts. VerifyHostKeyDNS Specifies whether to verify the remote key using DNS and SSHFP resource records. If this option is set to "yes", the client will implicitly trust keys that match a secure fingerprint from DNS. Insecure fingerprints will be handled as if this option was set to "ask". If this option is set to "ask", information on fingerprint match will be displayed, but the user will still need to confirm new host keys according to the StrictHostKeyChecking option. The argument must be "yes", "no" or "ask". The default is "no". Note that this option applies to protocol version 2 only. XAuthLocation Specifies the full pathname of the xauth(1) program. The default is /usr/bin/xauth.

FILES

~/.ssh/config This is the per-user configuration file. The format of this file is described above. This file is used by the ssh client. Because of the potential for abuse, this file must have strict permissions: read/write for the user, and not accessible by oth- ers. /etc/ssh/ssh_config Systemwide configuration file. This file provides defaults for those values that are not specified in the user's configuration file, and for those users who do not have a configuration file. This file must be world-readable.

SEE ALSO

ssh(1)

AUTHORS

OpenSSH is a derivative of the original and free ssh 1.2.12 release by Tatu Ylonen. Aaron Campbell, Bob Beck, Markus Friedl, Niels Provos, Theo de Raadt and Dug Song removed many bugs, re-added newer features and cre- ated OpenSSH. Markus Friedl contributed the support for SSH protocol versions 1.5 and 2.0. BSD September 25, 1999 BSD

1994 Man-cgi 1.15, Panagiotis Christias <christia@theseas.ntua.gr>