NAME

CGI::Application::Plugin::Authorization::Driver::DBI - DBI Authorization driver

SYNOPSIS

 use base qw(CGI::Application);
 use CGI::Application::Plugin::Authorization;

 # Simple task based authentication
 __PACKAGE__->authz->config(
     DRIVER => [ 'DBI',
         TABLES      => ['account', 'task'],
         JOIN_ON     => 'account.id = task.accountid',
         USERNAME    => 'account.name',
         CONSTRAINTS => {
             'task.name' => '__PARAM_1__',
         }
     ],
 );
 if ($self->authz->authorize('editfoo') {
    # User is allowed access if it can 'editfoo'
 }

DESCRIPTION

This Authorization driver uses the DBI module to allow you to gather authorization information from any database for which there is a DBD module. You can either provide an active database handle, or provide the parameters necesary to connect to the database.

DBH

The DBI database handle to use. Defaults to "$self->dbh()", which is provided and configured through CGI::Application::Plugin::DBH

When describing the database structure you have two options:

TABLE(S), JOIN_ON, USERNAME and CONSTRAINTS:: Use these values to describe the table structure, and an sql statement will be automatically generated to query the database
SQL:: just provide one SQL parameters that gives a complete sql statement that will be used to query the database

Following is a description of all the avaliable parameters:

TABLE(S)

Provide either a single table name, or an array of table names. You can give the table names aliases which can be referenced in later columns.

     TABLE => 'group',

 - or -

     TABLES => ['user U', 'group G'],

JOIN_ON

If you have specified multiple tables, then you need to provide an SQL expression that can be used to join those tables.

     JOIN_ON => 'user.id = group.userid',

 - or -

     JOIN_ON => 'U.id = G.userid',

USERNAME

This should be set to the column name that contains the username. This column will be compared against the currently logged in user.

     USERNAME => 'name'

 - or -

     USERNAME => 'U.name'

CONSTRAINTS

Constraints are used to restrict the database query against the options that are passed to the "authorize" method. In the common case, you will check these parameters against a group permission table, although there is no limit to the number of parameters that can be used. Each constraint can be set to a static value, or it can be set to '__PARAM_n__' where 'n' is the position of the parameter that is passed in to the "authorize" method.

     CONSTRAINTS => {
         'user.active' => 't',
         'group.type'  => '__PARAM_1__',
         'group.name'  => '__PARAM_2__',
     }

SQL

If you need to perform a complex query that can not be defined by the above syntax, then you can provide your own SQL statment where the first placeholder is used to fill in the username, and the rest of the placeholders are filled in using the parameters passed to the authorize method.

     SQL => 'SELECT count(*)
               FROM account
               LEFT JOIN ip ON (account.id = ip.accountid)
               LEFT JOIN task ON (account.id = task.accountid)
              WHERE account.name = ?
                AND (ip.address >> inet ? OR task.name = ?)
            ',

EXAMPLE

 #
 # Example table structure (for PostgreSQL):
 #
 CREATE TABLE account (
   id         SERIAL NOT NULL PRIMARY KEY,
   name       VARCHAR(50) NOT NULL
 );
 CREATE TABLE task (
   id         SERIAL NOT NULL PRIMARY KEY,
   accountid  INTEGER NOT NULL REFERENCES account(id),
   name       VARCHAR(50) NOT NULL
 );
 CREATE TABLE ip (
   id         SERIAL NOT NULL PRIMARY KEY,
   accountid  INTEGER NOT NULL REFERENCES account(id),
   address    INET NOT NULL
 );
 INSERT INTO account (name) VALUES ('testuser');
 INSERT INTO task (accountid, name) VALUES (1, 'editfoo');
 INSERT INTO ip (accountid, address) VALUES (1, '192.168.1.0/24');
 
 # Simple task based authentication
 __PACKAGE__->authz->config(
     DRIVER => [ 'DBI',
         # the handle comes from $self->dbh, via the "DBH" plugin. 
         TABLES      => ['account', 'task'],
         JOIN_ON     => 'account.id = task.accountid',
         USERNAME    => 'account.name',
         CONSTRAINTS => {
             'task.name'   => '__PARAM_1__',
             'task.active' => 't'
         }
     ],
 );
 if ($self->authz->authorize('editfoo') {
    # User is allowed access if they can 'editfoo'
 }

 # IP address configuration
 __PACKAGE__->authz('byIP')->config(
     DRIVER => [ 'DBI',
         SQL => 'SELECT count(*)
                   FROM account JOIN ip ON (account.id = ip.accountid)
                  WHERE account.name = ?
                    AND ip.address >> inet ?
                ',
     ],
 );
 if ($self->authz('byIP')->authorize($ENV{REMOTE_ADDR}) {
    # User is allowed to connect from this address
 }

 # both together in one test
 # IP address configuration
 __PACKAGE__->authz->config(
     DRIVER => [ 'DBI',
         SQL => 'SELECT count(*)
                   FROM account
                   JOIN ip ON (account.id = ip.accountid)
                   JOIN task ON (account.id = task.accountid)
                  WHERE account.name = ?
                    AND task.name = ?
                    AND ip.address >> inet ?
                ',
     ],
 );
 if ($self->authz->authorize('editfoo', $ENV{REMOTE_ADDR}) {
    # User is allowed to connect from this address if they can
    # also 'editfoo'
 }

METHODS

authorize_user

This method accepts a username followed by a list of parameters and will return true if the configured query returns at least one row based on the given parameters.

LICENCE AND COPYRIGHT

This module is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

DISCLAIMER OF WARRANTY

BECAUSE THIS SOFTWARE IS LICENSED FREE OF CHARGE, THERE IS NO WARRANTY FOR THE SOFTWARE, TO THE EXTENT PERMITTED BY APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT HOLDERS AND/OR OTHER PARTIES PROVIDE THE SOFTWARE "AS IS" WITHOUT WARRANTY OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE SOFTWARE IS WITH YOU. SHOULD THE SOFTWARE PROVE DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR, OR CORRECTION.

IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MAY MODIFY AND/OR REDISTRIBUTE THE SOFTWARE AS PERMITTED BY THE ABOVE LICENCE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE USE OR INABILITY TO USE THE SOFTWARE (INCLUDING BUT NOT LIMITED TO LOSS OF DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE SOFTWARE TO OPERATE WITH ANY OTHER SOFTWARE), EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.