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Figure 5-17. Configuring SSP via the wizard This page allows you to define settings for page and item attributes. For now, just accept the default settings and apply the settings in the wizard. Now the interesting part! Run the test as before (log in to the application as user jimb and try to manipulate the URL on the Update Bug screen). Rather than being able to see records that you should not be able to access, you will instead see a screen similar to Figure 5-18.

Figure 3-1. Components of a user story Story writing is in contrast to the traditional approach, where each requirement is written out in painstaking detail. Traditional requirements are intentionally verbose in order to convey to the individual fulfilling the requirement the intent of the requirement. This level of detail is needed because the customer is not usually available to interpret the requirement.

not a device. Thus, to specify that this file should be mounted just like a device, o loop is used. The rest of the command should be clear.

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Figure 5-18. SSP issuing an error So what has happened here If you examine the URL that was used, you will see that an additional parameter has been added (the session ID is shortened to 123 here just for readability of the example): f p=108:3:123::::P3_ID:9&cs=3E597ACB57167BF929355A86561141926 The cs parameter is the checksum, which is calculated based on the items and values that have been set by the application when building the URL. This checksum is then recalculated when the new page is being processed, and if the recalculated checksum does not match the checksum passed in the URL, an error is raised. So, with very little effort, you have prevented users from being able to modify the URL to access records that they should not be able to access. If you look back at the settings that were made for your application by the SSP wizard, you will see that for the Update Bug screen, each page item is set to Checksum Required Session Level, as shown in Figure 5-19. Therefore, when the user tries to modify the value of the P3_ID page item, which is protected by a checksum, the SSP functionality kicks in and issues the error you saw.

Note OK, it doesn t really have anything to do with Open Enterprise Server management, but it s nice to know anyway. If you have mounted the ISO-file of a CD-ROM on your file system this way, you might as well add some changes to it. Once the file is mounted, you can add and delete from the file in any manner you like. Finished your modifications Then unmount the device with the umount command. This saves the changes to the ISO-file, which you can then write to your CD burner with using your CD-burning software as in the case of K3b, which is included in Open Enterprise Server.

Figure 5-19. Page and item protection in the wizard Now that you ve seen how to protect your application from URL manipulation by using the defaults in the wizard, let s look at the four attribute categories you can protect with SSP: Page access protection Application item protection Page data entry item protection Page display-only item protection

The last example of an advanced mount to be presented here is mount t smbfs o username=sander,password=secret //Julia/ifolder /media/smb. This is a very practical mount that I m using to make my shared iFolder directory on my Windows laptop available from my Linux server. This is a Windows mount, so I need the file system type smbfs (-t smbfs). Now, since it is a mount to my laptop that is from somewhere else in the network, my laptop also wants to know who is trying to access my files. This is what the o username=sander, password=secret part of the command is used for. As a result of this command, I m able to access all the files on my Windows workstation on my Linux server.

Page access protection allows you to define SSP values for pages. You can select from the following values: Unrestricted: The page can be requested directly using a URL, either with or without session state arguments (such as page items and values, cache clearing, and so on). Arguments Must Have Checksum: If any arguments are passed in the URL, a corresponding checksum must also be provided. No Arguments Allowed: The page can be requested via a URL, but no request, clear cache. or page item and values are allowed in the URL. No URL Access: The page cannot be accessed directly using a URL. The page may be accessed only as the target of a page branch, which does not perform a URL redirect.

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