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Alias /memberonly/ /usr/local/apache/htdocs/protected/
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Here /memberonly/ alias points to /usr/local/apache/htdocs/ protected/ directory 9 Now create the following configuration segment in httpdconf:
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<Location /memberonly/> AuthName Home AuthType Basic PerlAuthenHandler Apache::AuthenDBI PerlSetVar Auth_DBI_data_source dbi:mysql:database=auth PerlSetVar Auth_DBI_username httpd PerlSetVar Auth_DBI_password 2manysecrets PerlSetVar Auth_DBI_pwd_table wwwusers PerlSetVar Auth_DBI_uid_field user PerlSetVar Auth_DBI_pwd_field passwd PerlSetVar Auth_DBI_encrypted on require valid-user </Location>\
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The following list gets you up to speed with what s going on in the above listing: The above configuration tells Apache to use the Apache::AuthenDBI as the handler for the /memberonly/ alias The PerlSetVar directives are used to set key=value pairs needed by this module The Auth_DBI_data_source key sets the database DSN that tells the module which database to connect by using which Perl DBD Here, the value is set to connect to a MySQL database called auth You should set the driver to whatever RDBM you are using For example, if you are using IBM DB2, your database source name (DSN) might say dbi:db2:database=auth The Auth_DBI_username and Auth_DBI_password keys set the database username and password to be used to connect to the named user database (that is, auth) The name of the password table is specified by the Auth_DBI_pwd_table key; similarly, the username and password fields are specified by Auth_DBI_uid_field and Auth_DBI_pwd_field keys respectively The Auth_DBI_encrypted key is set to on so that passwords stored in the database are assumed to be encrypted using the traditional Unix style one-way hash encryption function called crypt Finally, the require valid-user directive tells Apache to only allow access for those users who pass the authentication test
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Part II Web Site Administration
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10 You can restart the Apache server by using the /usr/local/apache/ bin/apachectl restart command and can try accessing the http:// your_server_name/memberonly directory to see if you can access the directory with invalid usernames and passwords If you enter a valid username and password, you should be authenticated
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Managing Users and Groups in Any RDBM
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Managing users and groups in a database by hand is very cumbersome Thankfully, you don t have to deal with such tasks You can use a set of Perl scripts to handle these chores quite efficiently Here is how 1 You will need to install the DBI package and the appropriate DBD::database modules from the Comprehensive Perl Archive Network (CPAN) For example, if you installed MySQL database, as the root user you can install the DBI and DBD modules from the command-line as follows:
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perl -MCPAN -e install DBI perl -MCPAN -e install DBD::mysql
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2 Check whether you have two CPAN modules called HTTPD::UserAdmin and HTTPD::GroupAdmin in your installed Perl distribution You can run the locate UserAdminpm and locate GroupAdminpm commands to determine whether you have them Typically, these two modules are installed as part of the standard distribution For example, on my system these modules appear as follows:
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/usr/lib/perl5/site_perl/560/HTTPD/UserAdminpm /usr/lib/perl5/site_perl/560/HTTPD/GroupAdminpm
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If you don t have one or both of the modules, install them as follows: as root download the HTTPD::UserAdmin and HTTPD::GroupAdmin CPAN modules from CPAN On a Linux system you can simply run the following commands to install them:
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perl -MCPAN -e install HTTPD::UserAdmin perl -MCPAN -e install HTTPD::GroupAdmin
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You might want to install the HTTPD::Tools package because it includes the two modules as well as other modules that are useful for Web servers in general
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3 Copy the manage_userspl script from the companion CD-ROM to /usr/bin directory (see the CD Appendix for information on where to find /usr/bin) Change the file permission to allow you to run it Set the permission using chmod 750 /usr/bin/manage_userspl command 4 Use your favorite text editor to modify the following lines of the script
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my my my my $DB_HOST $DB_PORT $DATABASE $DB_DRIVER = = = = localhost ; ; auth ; mysql ;
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7 Authenticating and Authorizing Web Site Visitors
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$DB_USER $DB_PASSWORD $ENCRYPTION $USER_TABLE $USERNAME_FIELD $PASSWORD_FIELD $GROUP_TABLE $GROUP_FIELD $MAXSZ_USER $MAXSZ_PWD $MAXSZ_GRP
= = = = = = = = = = =
kabir ; $dbpwd; crypt ; wwwusers ; username , passwd , wwwgroups ; groupname ; 40; 20; 40;
In the above code, you need to set the following variables: The $DB_HOST variable should be set to the database server you want to connect to If the database server is on the same machine as the Web server, the default value localhost can be left alone The $DB_PORT variable should be set to the database server port By default, the port is automatically selected unless you have used an untraditional port on the database server for client connection The $DATABASE variable should be set to the database name The default database name is auth and will only work if you have followed instructions in earlier sections The $DB_DRIVER variable should be set to the database driver you need to connect to the database server For MySQL database server this driver is called mysql and therefore the default will only work if you are using a MySQL database The $DB_USER variable should be set to the user who has been granted access to create, modify, or delete records in the $DATABASE-specified tables See Granting Apache Server Access to the User-Authentication Database in MySQL earlier in this chapter, to know about how you can grant a user access to a MySQL database The $DB_PASSWORD is intentionally not stored in the script to enhance security You must provide the password needed to access the database using the command-line option -dbpwd=database_password whenever you run the manage_userspl script You can hard code a password, but I recommend removing the hard coded password after you are done with the script The $ENCRYPTION variable can be set to none, crypt (default), or MD5 When set to none, passwords are stored in plain-text; when crypt is used, passwords are encrypted with the one-way hashing algorithm used in traditional Unix environment; when MD5 is used, password is stored as a message digest (MD5) value The $USER_TABLE variable should be set to the user table in your database This table must have $USERNAME_FIELD-specified username field and also the $PASSWORD_FIELD-specified password field