=================================================================== RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/ssh_config.5,v retrieving revision 1.6 retrieving revision 1.6.2.2 diff -u -r1.6 -r1.6.2.2 --- src/usr.bin/ssh/ssh_config.5 2003/02/06 09:27:29 1.6 +++ src/usr.bin/ssh/ssh_config.5 2003/09/16 20:50:44 1.6.2.2 @@ -34,7 +34,7 @@ .\" (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF .\" THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. .\" -.\" $OpenBSD: ssh_config.5,v 1.6 2003/02/06 09:27:29 markus Exp $ +.\" $OpenBSD: ssh_config.5,v 1.6.2.2 2003/09/16 20:50:44 brad Exp $ .Dd September 25, 1999 .Dt SSH_CONFIG 5 .Os @@ -104,7 +104,7 @@ given after the keyword. .Ql \&* and -.Ql ? +.Ql \&? can be used as wildcards in the patterns. A single @@ -115,13 +115,14 @@ .Ar hostname argument given on the command line (i.e., the name is not converted to a canonicalized host name before matching). -.It Cm AFSTokenPassing -Specifies whether to pass AFS tokens to remote host. -The argument to this keyword must be -.Dq yes -or -.Dq no . -This option applies to protocol version 1 only. +.It Cm AddressFamily +Specifies which address family to use when connecting. +Valid arguments are +.Dq any , +.Dq inet +(Use IPv4 only) or +.Dq inet6 +(Use IPv6 only.) .It Cm BatchMode If set to .Dq yes , @@ -176,8 +177,8 @@ client for interoperability with legacy protocol 1 implementations that do not support the .Ar 3des -cipher. Its use is strongly discouraged due to cryptographic -weaknesses. +cipher. +Its use is strongly discouraged due to cryptographic weaknesses. The default is .Dq 3des . .It Cm Ciphers @@ -193,7 +194,8 @@ .It Cm 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 +cleared. +This option is primarily useful when used from the .Nm ssh command line to clear port forwardings set in configuration files, and is automatically set by @@ -226,17 +228,41 @@ The argument must be an integer. This may be useful in scripts if the connection sometimes fails. 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 Specifies that a TCP/IP 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 a port number. -Currently the SOCKS4 protocol is supported, and +remote machine. +The argument must be a port number. +Currently the SOCKS4 and SOCKS5 protocols are supported, and .Nm ssh -will act as a SOCKS4 server. +will act as a SOCKS server. Multiple forwardings may be specified, and -additional forwardings can be given on the command line. Only -the superuser can forward privileged ports. +additional forwardings can be given on the command line. +Only 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 Sets the escape character (default: .Ql ~ ) . @@ -259,10 +285,11 @@ The default is .Dq no . .Pp -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, +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. .It Cm ForwardX11 @@ -277,18 +304,18 @@ The default is .Dq no . .Pp -X11 forwarding should be enabled with caution. Users with the ability -to bypass file permissions on the remote host (for the user's X -authorization database) can access the local X11 display through the -forwarded connection. An attacker may then be able to perform -activities such as keystroke monitoring. +X11 forwarding should be enabled with caution. +Users with the ability to bypass file permissions on the remote host +(for the user's X authorization database) +can access the local X11 display through the forwarded connection. +An attacker may then be able to perform activities such as keystroke monitoring. .It Cm GatewayPorts Specifies whether remote hosts are allowed to connect to local forwarded ports. By default, .Nm ssh -binds local port forwardings to the loopback address. This -prevents other remote hosts from connecting to forwarded ports. +binds local port forwardings to the loopback address. +This prevents other remote hosts from connecting to forwarded ports. .Cm GatewayPorts can be used to specify that .Nm ssh @@ -304,6 +331,18 @@ Specifies a file to use for the global host key database instead of .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 Specifies whether to try rhosts based authentication with public key authentication. @@ -336,7 +375,8 @@ specifications). .It Cm IdentityFile Specifies a file from which the user's RSA or DSA authentication identity -is read. The default is +is read. +The default is .Pa $HOME/.ssh/identity for protocol version 1, and .Pa $HOME/.ssh/id_rsa @@ -367,19 +407,6 @@ .Pp To disable keepalives, the value should be set to .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 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. @@ -395,8 +422,9 @@ .Nm ssh . The possible values are: QUIET, FATAL, ERROR, INFO, VERBOSE, DEBUG, DEBUG1, DEBUG2 and DEBUG3. -The default is INFO. DEBUG and DEBUG1 are equivalent. DEBUG2 -and DEBUG3 each specify higher levels of verbose output. +The default is INFO. +DEBUG and DEBUG1 are equivalent. +DEBUG2 and DEBUG3 each specify higher levels of verbose output. .It Cm MACs Specifies the MAC (message authentication code) algorithms in order of preference. @@ -432,7 +460,8 @@ Default is 22. .It Cm PreferredAuthentications Specifies the order in which the client should try protocol 2 -authentication methods. This allows a client to prefer one method (e.g. +authentication methods. +This allows a client to prefer one method (e.g. .Cm keyboard-interactive ) over another method (e.g. .Cm password ) @@ -474,8 +503,8 @@ 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 -.Dq none +Setting the command to +.Dq none disables this option entirely. Note that .Cm CheckHostIP @@ -500,26 +529,6 @@ Multiple forwardings may be specified, and additional forwardings can be given on the command line. 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 Specifies whether to try rhosts based authentication with RSA host authentication. @@ -545,12 +554,12 @@ .Dq yes . Note that this option applies to protocol version 1 only. .It Cm SmartcardDevice -Specifies which smartcard device to use. The argument to this keyword is -the device +Specifies which smartcard device to use. +The argument to this keyword is the device .Nm ssh should use to communicate with a smartcard used for storing the user's -private RSA key. By default, no device is specified and smartcard support -is not activated. +private RSA key. +By default, no device is specified and smartcard support is not activated. .It Cm StrictHostKeyChecking If this flag is set to .Dq yes , @@ -600,11 +609,9 @@ must be setuid root. Note that this option must be set to .Dq yes -if -.Cm RhostsAuthentication -and +for .Cm RhostsRSAAuthentication -authentications are needed with older servers. +with older servers. .It Cm User Specifies the user to log in as. This can be useful when a different user name is used on different machines. @@ -614,6 +621,12 @@ Specifies a file to use for the user host key database instead of .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 Specifies the full pathname of the .Xr xauth 1 @@ -639,6 +652,8 @@ for those users who do not have a configuration file. This file must be world-readable. .El +.Sh SEE ALSO +.Xr ssh 1 .Sh AUTHORS OpenSSH is a derivative of the original and free ssh 1.2.12 release by Tatu Ylonen. @@ -648,5 +663,3 @@ created OpenSSH. Markus Friedl contributed the support for SSH protocol versions 1.5 and 2.0. -.Sh SEE ALSO -.Xr ssh 1