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Most distributions come with the pam_time.so module. This allows you to control when and where from users can log onto the system. It is defined as an account interface type. You can add it to the login service in the so file like this: account required /lib/security/pam_time.so If you have more than one module stacked, then you should add the pam_time.so module before all the other account interface type modules. In the previous line, I added it as a required module, which means the check must be successful for authentication to succeed. The pam_time.so module is configured using the file time.conf, which is stored in the /etc/security directory. Listing 1-43 shows a line from this file. Listing 1-43. The time.conf File login;*;bob|jane;!Al2100-0600 I will break this rather confusing piece of configuration down and explain its component elements. Each element is separated by a semicolon. Each of these elements is a logic list, and you can use logical operators and tokens to control it further. service;terminal;users;times So the first element is service. In Listing 1-43 you can see that login is the service. If you specify a line in this file that refers to a service, you must also define the pam_time.so module

in that service s configuration file in /etc/pamd You can add the pam_timeso module to almost any one of the services defined in the /etc/pamd directory The next element is the terminal to which this time restriction applies Here I have specified the wildcard operator * for all terminals You can use a wildcard in any element except service but only once per element You could also specify a list of terminals separated by a |, tty1|tty2|tty3, or a type of terminal suffixed with a * wildcard such as ttyp* In the next element I specify which users this time restriction applies to, and I have used a logical operator here The first user is bob I have then used the logical or separator, |, to specify a second user, jane In this example this means the time restrictions apply to either bob or jane.

You could also use the logical operator & here to represent and For example, time restrictions apply to both bob and jane as in bob&jane The last element is the time restriction itself The time here is prefixed with ! This means anything but The next two letters Al is short for all, which indicates all days of the week The next eight digits are start and finish times in 24-hour time format separated by a hyphen (-) In Listing 1-43, you saw that the start and finish times are 21:00 (or 9 pm) and 06:00 (or 6 am), respectively If the finish time is lower than the start time (as is the case in Listing 1-43), then the finish time is deemed to be during the next day.

namespace ConsoleApplication7 { class Program { public static BlockingCollection<string> blockingCol = new BlockingCollection<string>(5); public static string[] Alphabet = new string[5] { "a", "b", "c", "d", "e" }; static void Main(string[] args) { ThreadPool.QueueUserWorkItem(new WaitCallback(ReadItems)); Console.WriteLine("Created thread to read items"); //Creating thread to read items note how we are already enumurating collection! ThreadPool.QueueUserWorkItem(new WaitCallback(AddItems)); Console.WriteLine("Created thread that will add items"); //Stop app closing Console.ReadKey(); } public static void AddItems(object StateInfo) { int i = 0; while (i < 200) { blockingCol.Add(i++.ToString()); Thread.Sleep(10); } }

So, putting this all together means that bob and jane can log onto any terminal at any time except between 9 pm and 6 am Let s look at another example login;ttyp*;!root;!Wd0000-2400 Here I block logins from all pseudo-terminals on the weekends for all users except root In the time element I have used the Wd entry, which indicates weekends You can also use Wk, which stands for weekdays, or the entries for the individual days of the week, which are Mo, Tu, We, Th, Fr, Sa, Su..

The next PAM module is called pam_login_alert.so and alerts via e-mail or syslog when a particular user (or users) logs onto the system. You can download the module at http:// www.kernel.org/pub/linux/libs/pam/pre/modules/pam_login_alert-0.10.tar.gz.

Create a temporary directory, and unpack the tar file into it. The package contains a number of files, including the source for the module. To create the module, you need to make and install it. puppy$ make puppy# make install This will results in a file called pam_login_alert.so, which is installed by default to the /lib/security directory. Also, two configuration files are created and copied to /etc. They are login_alert.conf and login.alert.users.

public static void ReadItems(object StateInfo) { //Warning this will run forever unless blockingCol.CompleteAdding() is called foreach (object o in blockingCol.GetConsumingEnumerable()) { Console.WriteLine("Read item: " + o.ToString()); } } } }