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Diff for /src/usr.bin/ssh/ssh_config.5 between version 1.5.2.3 and 1.6

version 1.5.2.3, 2003/09/16 21:20:28 version 1.6, 2003/02/06 09:27:29
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 given after the keyword.  given after the keyword.
 .Ql \&*  .Ql \&*
 and  and
 .Ql \&?  .Ql ?
 can be used as wildcards in the  can be used as wildcards in the
 patterns.  patterns.
 A single  A single
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 .Ar hostname  .Ar hostname
 argument given on the command line (i.e., the name is not converted to  argument given on the command line (i.e., the name is not converted to
 a canonicalized host name before matching).  a canonicalized host name before matching).
 .It Cm AddressFamily  .It Cm AFSTokenPassing
 Specifies which address family to use when connecting.  Specifies whether to pass AFS tokens to remote host.
 Valid arguments are  The argument to this keyword must be
 .Dq any ,  .Dq yes
 .Dq inet  or
 (Use IPv4 only) or  .Dq no .
 .Dq inet6  This option applies to protocol version 1 only.
 (Use IPv6 only.)  
 .It Cm BatchMode  .It Cm BatchMode
 If set to  If set to
 .Dq yes ,  .Dq yes ,
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 client for interoperability with legacy protocol 1 implementations  client for interoperability with legacy protocol 1 implementations
 that do not support the  that do not support the
 .Ar 3des  .Ar 3des
 cipher.  cipher.  Its use is strongly discouraged due to cryptographic
 Its use is strongly discouraged due to cryptographic weaknesses.  weaknesses.
 The default is  The default is
 .Dq 3des .  .Dq 3des .
 .It Cm Ciphers  .It Cm Ciphers
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 .It Cm ClearAllForwardings  .It Cm ClearAllForwardings
 Specifies that all local, remote and dynamic port forwardings  Specifies that all local, remote and dynamic port forwardings
 specified in the configuration files or on the command line be  specified in the configuration files or on the command line be
 cleared.  cleared.  This option is primarily useful when used from the
 This option is primarily useful when used from the  
 .Nm ssh  .Nm ssh
 command line to clear port forwardings set in  command line to clear port forwardings set in
 configuration files, and is automatically set by  configuration files, and is automatically set by
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 The argument must be an integer.  The argument must be an integer.
 This may be useful in scripts if the connection sometimes fails.  This may be useful in scripts if the connection sometimes fails.
 The default is 1.  The default is 1.
 .It Cm 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.  
 .It Cm DynamicForward  .It Cm DynamicForward
 Specifies that a TCP/IP port on the local machine be forwarded  Specifies that a TCP/IP port on the local machine be forwarded
 over the secure channel, and the application  over the secure channel, and the application
 protocol is then used to determine where to connect to from the  protocol is then used to determine where to connect to from the
 remote machine.  remote machine.  The argument must be a port number.
 The argument must be a port number.  Currently the SOCKS4 protocol is supported, and
 Currently the SOCKS4 and SOCKS5 protocols are supported, and  
 .Nm ssh  .Nm ssh
 will act as a SOCKS server.  will act as a SOCKS4 server.
 Multiple forwardings may be specified, and  Multiple forwardings may be specified, and
 additional forwardings can be given on the command line.  additional forwardings can be given on the command line.  Only
 Only the superuser can forward privileged ports.  the superuser can forward privileged ports.
 .It Cm EnableSSHKeysign  
 Setting this option to  
 .Dq yes  
 in the global client configuration file  
 .Pa /etc/ssh/ssh_config  
 enables the use of the helper program  
 .Xr ssh-keysign 8  
 during  
 .Cm HostbasedAuthentication .  
 The argument must be  
 .Dq yes  
 or  
 .Dq no .  
 The default is  
 .Dq no .  
 See  
 .Xr ssh-keysign 8  
 for more information.  
 .It Cm EscapeChar  .It Cm EscapeChar
 Sets the escape character (default:  Sets the escape character (default:
 .Ql ~ ) .  .Ql ~ ) .
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 The default is  The default is
 .Dq no .  .Dq no .
 .Pp  .Pp
 Agent forwarding should be enabled with caution.  Agent forwarding should be enabled with caution.  Users with the
 Users with the ability to bypass file permissions on the remote host  ability to bypass file permissions on the remote host (for the agent's
 (for the agent's Unix-domain socket)  Unix-domain socket) can access the local agent through the forwarded
 can access the local agent through the forwarded connection.  connection.  An attacker cannot obtain key material from the agent,
 An attacker cannot obtain key material from the agent,  
 however they can perform operations on the keys that enable them to  however they can perform operations on the keys that enable them to
 authenticate using the identities loaded into the agent.  authenticate using the identities loaded into the agent.
 .It Cm ForwardX11  .It Cm ForwardX11
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 The default is  The default is
 .Dq no .  .Dq no .
 .Pp  .Pp
 X11 forwarding should be enabled with caution.  X11 forwarding should be enabled with caution.  Users with the ability
 Users with the ability to bypass file permissions on the remote host  to bypass file permissions on the remote host (for the user's X
 (for the user's X authorization database)  authorization database) can access the local X11 display through the
 can access the local X11 display through the forwarded connection.  forwarded connection.  An attacker may then be able to perform
 An attacker may then be able to perform activities such as keystroke monitoring.  activities such as keystroke monitoring.
 .It Cm GatewayPorts  .It Cm GatewayPorts
 Specifies whether remote hosts are allowed to connect to local  Specifies whether remote hosts are allowed to connect to local
 forwarded ports.  forwarded ports.
 By default,  By default,
 .Nm ssh  .Nm ssh
 binds local port forwardings to the loopback address.  binds local port forwardings to the loopback address.  This
 This prevents other remote hosts from connecting to forwarded ports.  prevents other remote hosts from connecting to forwarded ports.
 .Cm GatewayPorts  .Cm GatewayPorts
 can be used to specify that  can be used to specify that
 .Nm ssh  .Nm ssh
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 Specifies a file to use for the global  Specifies a file to use for the global
 host key database instead of  host key database instead of
 .Pa /etc/ssh/ssh_known_hosts .  .Pa /etc/ssh/ssh_known_hosts .
 .It Cm GSSAPIAuthentication  
 Specifies whether authentication based on GSSAPI may be used, either using  
 the result of a successful key exchange, or using GSSAPI user  
 authentication.  
 The default is  
 .Dq yes .  
 Note that this option applies to protocol version 2 only.  
 .It Cm GSSAPIDelegateCredentials  
 Forward (delegate) credentials to the server.  
 The default is  
 .Dq no .  
 Note that this option applies to protocol version 2 only.  
 .It Cm HostbasedAuthentication  .It Cm HostbasedAuthentication
 Specifies whether to try rhosts based authentication with public key  Specifies whether to try rhosts based authentication with public key
 authentication.  authentication.
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 specifications).  specifications).
 .It Cm IdentityFile  .It Cm IdentityFile
 Specifies a file from which the user's RSA or DSA authentication identity  Specifies a file from which the user's RSA or DSA authentication identity
 is read.  is read. The default is
 The default is  
 .Pa $HOME/.ssh/identity  .Pa $HOME/.ssh/identity
 for protocol version 1, and  for protocol version 1, and
 .Pa $HOME/.ssh/id_rsa  .Pa $HOME/.ssh/id_rsa
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 .Pp  .Pp
 To disable keepalives, the value should be set to  To disable keepalives, the value should be set to
 .Dq no .  .Dq no .
   .It Cm KerberosAuthentication
   Specifies whether Kerberos authentication will be used.
   The argument to this keyword must be
   .Dq yes
   or
   .Dq no .
   .It Cm KerberosTgtPassing
   Specifies whether a Kerberos TGT will be forwarded to the server.
   This will only work if the Kerberos server is actually an AFS kaserver.
   The argument to this keyword must be
   .Dq yes
   or
   .Dq no .
 .It Cm LocalForward  .It Cm LocalForward
 Specifies that a TCP/IP port on the local machine be forwarded over  Specifies that a TCP/IP port on the local machine be forwarded over
 the secure channel to the specified host and port from the remote machine.  the secure channel to the specified host and port from the remote machine.
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 .Nm ssh .  .Nm ssh .
 The possible values are:  The possible values are:
 QUIET, FATAL, ERROR, INFO, VERBOSE, DEBUG, DEBUG1, DEBUG2 and DEBUG3.  QUIET, FATAL, ERROR, INFO, VERBOSE, DEBUG, DEBUG1, DEBUG2 and DEBUG3.
 The default is INFO.  The default is INFO.  DEBUG and DEBUG1 are equivalent.  DEBUG2
 DEBUG and DEBUG1 are equivalent.  and DEBUG3 each specify higher levels of verbose output.
 DEBUG2 and DEBUG3 each specify higher levels of verbose output.  
 .It Cm MACs  .It Cm MACs
 Specifies the MAC (message authentication code) algorithms  Specifies the MAC (message authentication code) algorithms
 in order of preference.  in order of preference.
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 Default is 22.  Default is 22.
 .It Cm PreferredAuthentications  .It Cm PreferredAuthentications
 Specifies the order in which the client should try protocol 2  Specifies the order in which the client should try protocol 2
 authentication methods.  authentication methods. This allows a client to prefer one method (e.g.
 This allows a client to prefer one method (e.g.  
 .Cm keyboard-interactive )  .Cm keyboard-interactive )
 over another method (e.g.  over another method (e.g.
 .Cm password )  .Cm password )
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 Host key management will be done using the  Host key management will be done using the
 HostName of the host being connected (defaulting to the name typed by  HostName of the host being connected (defaulting to the name typed by
 the user).  the user).
 Setting the command to  Setting the command to
 .Dq none  .Dq none
 disables this option entirely.  disables this option entirely.
 Note that  Note that
 .Cm CheckHostIP  .Cm CheckHostIP
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 Multiple forwardings may be specified, and additional  Multiple forwardings may be specified, and additional
 forwardings can be given on the command line.  forwardings can be given on the command line.
 Only the superuser can forward privileged ports.  Only the superuser can forward privileged ports.
   .It Cm RhostsAuthentication
   Specifies whether to try rhosts based authentication.
   Note that this
   declaration only affects the client side and has no effect whatsoever
   on security.
   Most servers do not permit RhostsAuthentication because it
   is not secure (see
   .Cm RhostsRSAAuthentication ) .
   The argument to this keyword must be
   .Dq yes
   or
   .Dq no .
   The default is
   .Dq no .
   This option applies to protocol version 1 only and requires
   .Nm ssh
   to be setuid root and
   .Cm UsePrivilegedPort
   to be set to
   .Dq yes .
 .It Cm RhostsRSAAuthentication  .It Cm RhostsRSAAuthentication
 Specifies whether to try rhosts based authentication with RSA host  Specifies whether to try rhosts based authentication with RSA host
 authentication.  authentication.
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 .Dq yes .  .Dq yes .
 Note that this option applies to protocol version 1 only.  Note that this option applies to protocol version 1 only.
 .It Cm SmartcardDevice  .It Cm SmartcardDevice
 Specifies which smartcard device to use.  Specifies which smartcard device to use. The argument to this keyword is
 The argument to this keyword is the device  the device
 .Nm ssh  .Nm ssh
 should use to communicate with a smartcard used for storing the user's  should use to communicate with a smartcard used for storing the user's
 private RSA key.  private RSA key. By default, no device is specified and smartcard support
 By default, no device is specified and smartcard support is not activated.  is not activated.
 .It Cm StrictHostKeyChecking  .It Cm StrictHostKeyChecking
 If this flag is set to  If this flag is set to
 .Dq yes ,  .Dq yes ,
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 must be setuid root.  must be setuid root.
 Note that this option must be set to  Note that this option must be set to
 .Dq yes  .Dq yes
 for  if
   .Cm RhostsAuthentication
   and
 .Cm RhostsRSAAuthentication  .Cm RhostsRSAAuthentication
 with older servers.  authentications are needed with older servers.
 .It Cm User  .It Cm User
 Specifies the user to log in as.  Specifies the user to log in as.
 This can be useful when a different user name is used on different machines.  This can be useful when a different user name is used on different machines.
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 Specifies a file to use for the user  Specifies a file to use for the user
 host key database instead of  host key database instead of
 .Pa $HOME/.ssh/known_hosts .  .Pa $HOME/.ssh/known_hosts .
 .It Cm VerifyHostKeyDNS  
 Specifies whether to verify the remote key using DNS and SSHFP resource  
 records.  
 The default is  
 .Dq no .  
 Note that this option applies to protocol version 2 only.  
 .It Cm XAuthLocation  .It Cm XAuthLocation
 Specifies the full pathname of the  Specifies the full pathname of the
 .Xr xauth 1  .Xr xauth 1
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 for those users who do not have a configuration file.  for those users who do not have a configuration file.
 This file must be world-readable.  This file must be world-readable.
 .El  .El
 .Sh SEE ALSO  
 .Xr ssh 1  
 .Sh AUTHORS  .Sh AUTHORS
 OpenSSH is a derivative of the original and free  OpenSSH is a derivative of the original and free
 ssh 1.2.12 release by Tatu Ylonen.  ssh 1.2.12 release by Tatu Ylonen.
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 created OpenSSH.  created OpenSSH.
 Markus Friedl contributed the support for SSH  Markus Friedl contributed the support for SSH
 protocol versions 1.5 and 2.0.  protocol versions 1.5 and 2.0.
   .Sh SEE ALSO
   .Xr ssh 1
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  Added in v.1.6