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Only when the incoming user has been authenticated does the child process pass the user to a process with the authority of a privileged user This helps reduce the risk of a compromise of the sshd daemon allowing root access to the system The PasswordAuthentication and RSAAuthentication options, if set to yes, tell sshd to allow these authentications mechanisms The last option enables the use of the sftp-server, which allows a remote user to connect to the system using the sftp The subsystem option spawns the additional command sftp-server when sshd detects an incoming sftp request You can also run other subsystems if you want You can add some additional options to the sshd_config file (see Table 3-15)..

Allows only those groups listed to connect to the system. Allows only those users listed to connect to the system. Denies connections from the listed groups to the system. Denies connections from the listed users to the system. The server disconnects after this time if the user has not successfully logged in. Specifies whether sshd should try to verify the remote hostname.

The first four options simply control who can sign into the system. This allows you to be selective about what users and groups have permission to connect via ssh. The LoginGraceTime option allows you to specify a time limit for users to log in. The default is 120 seconds after which the session is disconnected. The VerifyReverseMapping option tells sshd to confirm that the resolved remote hostname for the remote IP address maps back to the IP address from which the connection has been initiated. The default is no.

In Silverlight 3.0 and WPF4.0, you can now bind directly to another element. This example binds a TextBlock s Text property to the Text property of the text box txtValue: <TextBox x:Name="txtValue" Width="200" Canvas.Top="50" ></TextBox> <TextBlock Text="{Binding Text, ElementName=txtValue}"></TextBlock>

The OpenSSH package also has the capability to forward ports much like Stunnel does. You can forward any TCP traffic such as POP3, SMTP or HTTP traffic through the SSH tunnel. However, , any ports below 1024 are considered privileged; if you want to forward one of these, the user creating the tunnel must have root privileges. You will also need to have sshd running on the remote system to make the initial connection and create the tunnel. You will also need to ensure you are able to authenticate to the system you are creating the tunnel to and that you have sufficient privileges for the tunnel to be created. OpenSSH is capable of two types of forwarding local and remote. Local-port forwarding forwards any traffic coming into a specific local port to a specific remote port. Remoteforwarding monitors a specific remote port and forwards the traffic from that port to a specific local port. Listing 3-42 shows OpenSSH local-port forwarding of traffic from port 25 on the local system to port 1025 on the remote system, 192.168.0.1. Listing 3-42. Local Port Forwarding Using ssh puppy# ssh -fN -L 25:192.168.0.1:1025 bob@192.168.0.1 bob@192.168.0.1's password: The -L option is structured as localport:remotehost:remoteport, or in this example 25:192.1658.0.1:1025. I have also added the -fN options to the command to tell ssh to go into the background after establishing the port forwarding. The connection will then exist as an ssh process and forward the ports until the process is killed or the system restarted. Remoteport forwarding works in a similar way. Listing 3-43 shows a remote-port forward.

Table 1-1 shows some of the typical services that are generally started on both Red Hat and Debian systems, describes what they do, and tells whether I recommend removing them from your startup.

The default setting applies changes to margin settings to the whole document. So, if you want to change the margins for the entire document, you can click anywhere in the document and then edit the margin settings. To change the current margin settings, you can use the Margins command in the Page Layout group. You can choose from a list of preset options (see Figure 6-8), or you can customize your own. If you create a custom setting, the last custom setting will be included at the top of the list.

s Note I am referring to the releases Red Hat 9, Red Hat Fedora Core, Red Hat Enterprise Linux 3, and

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WPF 4.0 and Silverlight 3.0 introduce some great new effects functionality. Let s take a look at these now.