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As a result of Sendmail being chrooted, it cannot see this file (because it is outside the chroot jail) and therefore refuses to authenticate using SASL So, you need to move the mux and other saslauthd files into the chroot jail and link it back to its old location via a symbolic link to keep the saslauthd daemon happy The command in Listing 8-19 takes you through the steps needed to do this making a new directory in your chroot environment, moving the required files into the chroot jail, and linking (a symbolic link only, which is important to maintain the security of your chroot jail) back to the original location You need to restart saslauthd after doing this Listing 8-19.

Now that you have the ability to run applications offline, it is very useful to be able to determine whether the user is connected to the Internet. This can be accomplished through the GetIsNetworkAvailable method that returns true if the user is connected: System.Net.NetworkInformation.NetworkInterface.GetIsNetworkAvailable()

Running saslauthd in Sendmail chroot Jail puppy# mkdir -p /chroot/sendmail/var/run puppy# mv /var/run/saslauthd /chroot/sendmail/var/run/saslauthd puppy# ln -s /chroot/sendmail/var/run/saslauthd /var/run/saslauthd If your remote users do not have a local login to the mail system (for example, virtual users), then you can use some other methods to authenticate them One of the easiest is to create a stand-alone database of usernames and passwords In this case, you would change your pwcheck_method to the following: pwcheck_method: auxprop.

auxprop stands for auxiliary property plug-ins, of which the default is the sasldb type As it is the default, you do not need to specify anything else other than auxprop, because SASL knows this indicates sasldb By default with the sasldb plug-in, SASL looks for the file /etc/sasldb2 This may already exist on your system; if it does not, do not panic When you create your first user, SASL will automatically create the /etc/sasldb2 file if it does not already exist To add users to the sasldb2 file, you use the saslpasswd2 command that comes with the SASL package You will need a username and a domain, which should match the FQDN that is defined in Sendmail Listing 8-20 shows you how to set up the command Listing 8-20 The saslpasswd2 Command puppy# saslpasswd2 -c -u domain username The -c option tells SASL to create a new user account.

The -u option specifies the domain for that user You should replace the variables domain and username with the FQDN of the Sendmail server and the required username for the user, respectively You will be prompted by the saslpasswd2 binary to enter a password for this username If you have Sendmail located in a chroot jail, then you can use an additional option, -f, to specify the location of the sasldb2 file so you can place it in the jail and have it accessible to Sendmail puppy# saslpasswd2 -c -f /chroot/sendmail/etc -u domain username Using the auxprop method, you can also configure Sendmail to authenticate via Lightweight Directory Access Protocol (LDAP) or a variety of SQL-based databases such as MySQL or PostgreSQL These methods are most useful when setting up virtual domains and virtual users See the Sendmail Web site for some HOWTOs about how to achieve this authentication.

Most printers cannot print all the way to the edge of the page, so depending on your printer, there may be a required minimum width for margin settings. Check your printer manual for information about the minimum margin settings for your printer.

The following code shows how to apply a style to a button at runtime: myButton.Style=(Style)Application.Current.Resources["MyHorridFuciaStyle"];

Finally, it is important to note that if you are using saslauthd or sasldb2 as the authentication method, then you are using the PLAIN or LOGIN mechanism for authentication These use simple Base64-encoded passwords that can be easily sniffed out and cracked across your network This is where TLS comes together with SASL to allow encrypted authentication You should ensure your mail client is configured to attempt an SSL/TLS connection with your mail server as well as configured to do an SMTP AUTH when sending e-mail You can also ensure your AUTH_OPTIONS flag includes the p parameter, which requires Sendmail to allow SMTP AUTH only if a security layer such as TLS is in place first If you do not use TLS with SMTP AUTH and SASL, then the level of security offered is minimal; in that case, I recommend you look at alternative methods of authentication..