=================================================================== RCS file: /cvsrepo/anoncvs/cvs/src/usr.bin/ssh/ssh_config.5,v retrieving revision 1.6.2.3 retrieving revision 1.7 diff -u -r1.6.2.3 -r1.7 --- src/usr.bin/ssh/ssh_config.5 2004/03/04 18:18:17 1.6.2.3 +++ src/usr.bin/ssh/ssh_config.5 2003/03/28 10:11:43 1.7 @@ -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 1.6.2.3 2004/03/04 18:18:17 brad Exp $ +.\" $OpenBSD: ssh_config.5,v 1.7 2003/03/28 10:11:43 jmc 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 @@ -115,14 +115,13 @@ .Ar hostname argument given on the command line (i.e., the name is not converted to a canonicalized host name before matching). -.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 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 BatchMode If set to .Dq yes , @@ -186,6 +185,7 @@ in order of preference. Multiple ciphers must be comma-separated. The default is +.Pp .Bd -literal ``aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour, aes192-cbc,aes256-cbc'' @@ -227,42 +227,18 @@ 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 and SOCKS5 protocols are supported, and +Currently the SOCKS4 protocol is supported, and .Nm ssh -will act as a SOCKS server. +will act as a SOCKS4 server. Multiple forwardings may be specified, and 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 . -This option should be placed in the non-hostspecific section. -See -.Xr ssh-keysign 8 -for more information. .It Cm EscapeChar Sets the escape character (default: .Ql ~ ) . @@ -306,27 +282,9 @@ .Pp 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) +(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 -if the -.Cm ForwardX11Trusted -option is also enabled. -.It Cm ForwardX11Trusted -If the this option is set to -.Dq yes -then remote X11 clients will have full access to the original X11 display. -If this option is set to -.Dq no -then remote X11 clients will be considered untrusted and prevented -from stealing or tampering with data belonging to trusted X11 -clients. -.Pp -The default is -.Dq no . -.Pp -See the X11 SECURITY extension specification for full details on -the restrictions imposed on untrusted clients. +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. @@ -349,16 +307,6 @@ Specifies a file to use for the global host key database instead of .Pa /etc/ssh/ssh_known_hosts . -.It Cm GSSAPIAuthentication -Specifies whether user authentication based on GSSAPI is allowed. -The default is -.Dq no . -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. @@ -391,8 +339,7 @@ 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 @@ -406,6 +353,36 @@ It is possible to have multiple identity files specified in configuration files; all these identities will be tried in sequence. +.It Cm KeepAlive +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 temporarily, and some people +find it annoying. +.Pp +The default is +.Dq yes +(to send keepalives), 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. +.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. @@ -459,8 +436,7 @@ 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 ) @@ -528,6 +504,26 @@ 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. @@ -552,49 +548,13 @@ The default is .Dq yes . Note that this option applies to protocol version 1 only. -.It Cm ServerAliveInterval -Sets a timeout interval in seconds after which if no data has been received -from the server, -.Nm 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. -.It Cm ServerAliveCountMax -Sets the number of server alive messages (see above) which may be -sent without -.Nm ssh -receiving any messages back from the server. -If this threshold is reached while server alive messages are being sent, -.Nm ssh -will disconnect from the server, terminating the session. -It is important to note that the use of server alive messages is very -different from -.Cm TCPKeepAlive -(below). -The server alive messages are sent through the encrypted channel -and therefore will not be spoofable. -The TCP keepalive option enabled by -.Cm TCPKeepAlive -is spoofable. -The server alive mechanism is valuable when the client or -server depend on knowing when a connection has become inactive. -.Pp -The default value is 3. -If, for example, -.Cm ServerAliveInterval -(above) is set to 15, and -.Cm ServerAliveCountMax -is left at the default, if the server becomes unresponsive ssh -will disconnect after approximately 45 seconds. .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 , @@ -630,23 +590,6 @@ .Dq ask . The default is .Dq ask . -.It Cm 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 temporarily, and some people -find it annoying. -.Pp -The default is -.Dq 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. -.Pp -To disable TCP keepalive messages, the value should be set to -.Dq no . .It Cm UsePrivilegedPort Specifies whether to use a privileged port for outgoing connections. The argument must be @@ -661,9 +604,11 @@ must be setuid root. Note that this option must be set to .Dq yes -for +if +.Cm RhostsAuthentication +and .Cm RhostsRSAAuthentication -with older servers. +authentications are needed 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. @@ -673,29 +618,6 @@ 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. -If this option is set to -.Dq 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 -.Dq ask . -If this option is set to -.Dq ask , -information on fingerprint match will be displayed, but the user will still -need to confirm new host keys according to the -.Cm StrictHostKeyChecking -option. -The argument must be -.Dq yes , -.Dq no -or -.Dq ask . -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 @@ -721,8 +643,6 @@ 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. @@ -732,3 +652,5 @@ created OpenSSH. Markus Friedl contributed the support for SSH protocol versions 1.5 and 2.0. +.Sh SEE ALSO +.Xr ssh 1