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The password for the connection. If it is displayed as P:, the password is in plain text. P= the password is Base64 encoded. Username for authentication. The user allowed to set up the connection. The realm. Usually the FQDN of your system. If it is omitted, Sendmail will use the content of the $j macro. A list of the supported mechanisms for this connection, separated by spaces. If you omit this, then Sendmail will use the contents of the AuthMechanisms option.

It is now possible to refer to external resource dictionary files within your application: <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="myExternalResources.xaml" /> </ResourceDictionary.MergedDictionaries> </ResourceDictionary>

To authenticate, you must have at least a username, U, or the authentication identifier, I. Listing 8-23 shows some sample entries. Listing 8-23. Sample authinfo Entries AuthInfo:anotherdomain.com "U:jim" "P:tinker" AuthInfo:host.overthere.com "U:jim" "P=a1323498fkfg" "M:PLAIN LOGIN" AuthInfo:192.168.1.100 "U:jim" "P:tailor" "R:puppy.yourdomain.com" Create your authinfo database. puppy# makemap hash /etc/mail/authinfo < authinfo

Now secure it. It should be owned by the root user and chmoded to 0600. Now restart Sendmail to update your configuration, and you should be able to authenticate using the entries contained in your authinfo database.

s Caution Do not ever use the root user or indeed any username or password combination that exists on

A major issue in previous versions of Silverlight was that there was no capability of transferring files to a user. Silverlight 3.0 has a new file save dialog that allows users to save content to their local machine rather than to isolated storage. This example creates a text file and then gives the user the option to save it: void cmdSave_Click(object sender, RoutedEventArgs e) { SaveFileDialog SaveDialog = new SaveFileDialog(); if (SaveDialog.ShowDialog() == true) { System.IO.Stream fs = null; try { fs = SaveDialog.OpenFile(); byte[] info = (new System.Text.UTF8Encoding(true)).GetBytes("Test text to write to file"); fs.Write(info, 0, info.Length); } finally { fs.Close(); } } }

your client or server system as a login. Always assume that the contents of your authinfo database could be compromised.

Listing 3-41 A sample sshd_config File Port 22 Protocol 2 SyslogFacility AUTH LogLevel INFO PermitRootLogin no StrictModes yes UsePrivilegeSeparation yes PasswordAuthentication yes RSAAuthentication yes Compression yes X11Forwarding no Subsystem sftp /usr/libexec/openssh/sftp-server Unlike the ssh_config file, no Host entry exists The settings here apply to the sshd server overall, not to a specific client connection The first entries Port and Protocol explicitly specify the port sshd will bind to and the version of the SSH protocol to use In this case, I am binding to the default TCP port of 22 and using only the SSH Version 2 protocol The next two options control how sshd logs to the syslog daemon; the SyslogFacility option allowing you to specify the facility you want to log to, and LogLevel controls the verbosity of the output of the sshd daemon The next options deal with the security of sshd.

The first option, PermitRootLogin, is particularly important and something I recommend you always set to no This prevents the root user from logging into the system via ssh With this set to no, you prevent an attacker from even attempting connections to root using ssh The next option, StrictModes, checks if the files and directories in a user s home directory are world-writable If this option is set to yes and any of the files or directories in a user s home directory are world-writable, then the user will not be allowed to log on The final of these three options is UsePriviledgeSeparation If set to yes, the sshd process is divided into two processes, one of them a child process that is unprivileged and that handles all incoming network traffic.

Files shown in the SaveDialog window can be filtered by type using the Filter and FilterIndex properties. The Filter property allows you to specify a pipe-delimitated list of file types and FilterIndex (0 based) sets the default filter to use. This example shows how to show two filter options with the default filter option set to all files: SaveDialog.Filter = "Text Files (.txt)|*.txt|All Files|*.*"; //Set default filter to All Files SaveDialog.FilterIndex = 1;