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As you can see, pure-ftpd offers a few options to handle authentication. Of these options, I recommend using the default value which is set to PAM, as this gives you the most flexibility in setting up how user authentication is handled. Listing 11-10 shows the default PAM configuration file that s used when PAM authentication is enabled. Listing 11-10. The Default pure-ftpd PAM Configuration File # PAM config for pure-ftpd # allow anonymous users auth sufficient pam_ftp.so auth required pam_unix_auth.so shadow use_first_pass

Summary

Another problem involving incorrect or inconsistent spelling arises when you might be expecting a particular set of values or categories in a field. For example, in our Member table, we might be expecting values M and F in the Gender column, but there may be the odd male or m value. In the MemberType column, we expect a Junior value, Senior value, or Associate value, but in practice, it may have other values, such as jnior or senor . If the tables have been designed with appropriate check constraints or foreign keys, this won t be a problem. However, often these constraints are not present, so it is useful to check for problematic entries with a query such as the one in Listing 11-11.

# /etc/ftpusers contain user list with DENIED access auth required pam_listfile.so item=user sense=deny\ # file=/etc/ftpusers onerr=succeed # Uncomment next line to allow non-anonymous ftp access ONLY for users, # listed in /etc/ftpallow #auth required pam_listfile.so item=user\ #sense=allow file=/etc/ftpallow onerr=fail # standard auth required account required session required

This chapter has been a whistle-stop tour of Evolution s main features. You ve looked at e-mail creation and organization, contacts management, working with the appointments calendar, and editing the task list and memos. Evolution is a powerful program. Be sure to take a look at its help documentation (Help Contents) to learn more about it. This chapter also discussed the instant messaging client and how it integrates with the Me menu. The next chapter will go into greater detail about this new feature and what can you do with it.

Nautilus includes a simple search tool. Click the Search button (represented by a magnifying glass) on the toolbar, and you will see a text box below the toolbar. In this text box, type any part of the filename you want to find. For example, typing festival will return any filenames with festival in them. By clicking the plus sign icon next to the Reload button after a search, you can specify an exact file type. To do this, click the drop-down list that appears and ensure that File Type is selected. Then click the drop-down list alongside this and select the particular file type you want to find. For example, suppose you re searching for a picture taken at a festival, and you know the filename contains the word festival. You also have various documents you created related to attending the festival, and their filenames also contain the word festival. In this case, to find only photo files, you can select Picture from the drop-down list. The list, including the Picture type, is shown in Figure 10-3. You can also restrict the search to a particular location in your file system. Simply click the plus sign icon next to the Reload button again and select Location in the drop-down list. Click the drop-down list beside this one and browse for the location in which you think your files might be.

As you can see, the first thing handled by the pure-ftpd PAM configuration file is anonymous user authentication: the line auth sufficient pam_ftp.so specifies that anonymous users are welcome if the conditions defined in pam_ftp.so are met. This PAM module defines that a user who s mentioned in /etc/ftpusers will get access. So, you need to list the user anonymous in this file to enable anonymous user access. Next, in the /home/ftp directory, create a structure of all the files you want these users to have access to. By using the sufficient statement in the PAM rule that allows users to come in via pam_ftp.so, you give user anonymous access without further restrictions. For all other users, the specifications in pam_unix_auth.so are used. This configuration file allows regular users to authenticate using their user name as it exists in /etc/passwd and /etc/shadow. The other lines in the PAM file are not as important for user authentication.

Listing 11-11. Finding Inconsistent Data in a Categorical Column Such As MemberType SELECT * FROM Member WHERE Gender NOT IN ('Senior','Junior','Associate')