.\" (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: sshd_config.5,v 1.35 2004/06/26 09:14:40 jmc Exp $
+.\" $OpenBSD: sshd_config.5,v 1.44 2005/07/25 11:59:40 markus Exp $
.Dd September 25, 1999
.Dt SSHD_CONFIG 5
.Os
user environments.
For this reason, care should be taken in the use of this directive.
The default is not to accept any environment variables.
+.It Cm AddressFamily
+Specifies which address family should be used by
+.Nm sshd .
+Valid arguments are
+.Dq any ,
+.Dq inet
+(use IPv4 only) or
+.Dq inet6
+(use IPv6 only).
+The default is
+.Dq any .
.It Cm AllowGroups
This keyword can be followed by a list of group name patterns, separated
by spaces.
.Dq aes128-ctr ,
.Dq aes192-ctr ,
.Dq aes256-ctr ,
+.Dq arcfour128 ,
+.Dq arcfour256 ,
.Dq arcfour ,
.Dq blowfish-cbc ,
and
.Dq cast128-cbc .
The default is
.Bd -literal
- ``aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour,
- aes192-cbc,aes256-cbc,aes128-ctr,aes192-ctr,aes256-ctr''
+ ``aes128-cbc,3des-cbc,blowfish-cbc,cast128-cbc,arcfour128,
+ arcfour256,arcfour,aes192-cbc,aes256-cbc,aes128-ctr,
+ aes192-ctr,aes256-ctr''
.Ed
-.It Cm ClientAliveInterval
-Sets a timeout interval in seconds after which if no data has been received
-from the client,
-.Nm sshd
-will send a message through the encrypted
-channel to request a response from the client.
-The default
-is 0, indicating that these messages will not be sent to the client.
-This option applies to protocol version 2 only.
.It Cm ClientAliveCountMax
Sets the number of client alive messages (see above) which may be
sent without
.Cm ClientAliveCountMax
is left at the default, unresponsive ssh clients
will be disconnected after approximately 45 seconds.
+.It Cm ClientAliveInterval
+Sets a timeout interval in seconds after which if no data has been received
+from the client,
+.Nm sshd
+will send a message through the encrypted
+channel to request a response from the client.
+The default
+is 0, indicating that these messages will not be sent to the client.
+This option applies to protocol version 2 only.
.It Cm Compression
-Specifies whether compression is allowed.
+Specifies whether compression is allowed, or delayed until
+the user has authenticated successfully.
The argument must be
-.Dq yes
+.Dq yes ,
+.Dq delayed ,
or
.Dq no .
The default is
-.Dq yes .
+.Dq delayed .
.It Cm DenyGroups
This keyword can be followed by a list of group name patterns, separated
by spaces.
.Cm GatewayPorts
can be used to specify that
.Nm sshd
-should bind remote port forwardings to the wildcard address,
-thus allowing remote hosts to connect to forwarded ports.
-The argument must be
+should allow remote port forwardings to bind to non-loopback addresses, thus
+allowing other hosts to connect.
+The argument may be
+.Dq no
+to force remote port forwardings to be available to the local host only,
.Dq yes
-or
-.Dq no .
+to force remote port forwardings to bind to the wildcard address, or
+.Dq clientspecified
+to allow the client to select the address to which the forwarding is bound.
The default is
.Dq no .
.It Cm GSSAPIAuthentication
The default is
.Dq yes .
Note that this option applies to protocol version 2 only.
-.It Cm GSSAPICleanupCredentials
-Specifies whether to automatically destroy the user's credentials cache
-on logout.
-The default is
-.Dq yes .
-Note that this option applies to protocol version 2 only.
.It Cm GSSAPIKeyExchange
-Specifies whether key exchange based on GSSAPI may be used. When using
-GSSAPI key exchange the server need not have a host key.
+Specifies whether key exchange based on GSSAPI is allowed. GSSAPI key exchange
+doesn't rely on ssh keys to verify host identity.
The default is
.Dq yes .
Note that this option applies to protocol version 2 only.
-.It Cm GSSAPIUseSessionCredCache
-Specifies whether a unique credentials cache name should be generated per
-session for storing delegated credentials.
+.It Cm GSSAPICleanupCredentials
+Specifies whether to automatically destroy the user's credentials cache
+on logout.
The default is
.Dq yes .
Note that this option applies to protocol version 2 only.
Specifies whether
.Nm sshd
should ignore the user's
-.Pa $HOME/.ssh/known_hosts
+.Pa ~/.ssh/known_hosts
during
.Cm RhostsRSAAuthentication
or
The default is
.Dq no .
.It Cm PermitRootLogin
-Specifies whether root can login using
+Specifies whether root can log in using
.Xr ssh 1 .
The argument must be
.Dq yes ,
.Pp
If this option is set to
.Dq without-password
-password authentication is disabled for root. Note that other authentication
-methods (e.g., keyboard-interactive/PAM) may still allow root to login using
-a password.
+password authentication is disabled for root.
.Pp
If this option is set to
.Dq forced-commands-only
.Pp
If this option is set to
.Dq no
-root is not allowed to login.
+root is not allowed to log in.
.It Cm PermitUserEnvironment
Specifies whether
.Pa ~/.ssh/environment
.It Cm PrintLastLog
Specifies whether
.Nm sshd
-should print the date and time when the user last logged in.
+should print the date and time of the last user login when a user logs
+in interactively.
The default is
.Dq yes .
.It Cm PrintMotd
.It Cm UseDNS
Specifies whether
.Nm sshd
-should lookup the remote host name and check that
+should look up the remote host name and check that
the resolved host name for the remote IP address maps back to the
very same IP address.
The default is
andersk / gssapi-openssh.git / blobdiff