Author image John D Groenveld

NAME

Apache::DBILogin - authenticates and authorizes via a DBI connection

SYNOPSIS

 #in .htaccess
 AuthName MyAuth
 AuthType Basic
 PerlAuthenHandler Apache::DBILogin::authen
 PerlSetVar Auth_DBI_data_source dbi:Oracle:SQLNetAlias
 PerlAuthzHandler Apache::DBILogin::authz
 
 allow from all
 require group connect resource dba
 satisfy all

 #in startup.pl
 package Apache::DBILogin;
 
 # is_member function for authz handler
 #  expects request object, database handle, and group for which to test
 #  returns valid response code
 sub is_member {
     my ($r, $dbh, $group) = @_;
 
     my $sth;
     eval {
         # no, Oracle doesn't support binding in SET ROLE statement
         $sth = $dbh->prepare("SET ROLE $group") or die $DBI::errstr;
     };
     return ( MP2 ? Apache2::Const::HTTP_INTERNAL_SERVER_ERROR
                  : Apache::Constants::HTTP_INTERNAL_SERVER_ERROR ) if ( $@ );
        
     return ( defined $sth->execute() ) ? (MP2 ? Apache2::Const::OK
                                               : Apache::Constants::OK)
                                        : (MP2 ? Apache2::Const::HTTP_FORBIDDEN
                                               : Apache::Constants::HTTP_FORBIDDEN);
 }

DESCRIPTION

Apache::DBILogin allows authentication and authorization against a multi-user database.

It is intended to facilitate web-based transactions against a database server as a particular database user. If you wish authenticate against a passwd table instead, please see Edmund Mergl's Apache::AuthDBI module.

Group authorization is handled by your Apache::DBILogin::is_member() function which you must define if you enable the authz handler.

The above example uses Oracle roles to assign group membership. A role is a set of database privileges which can be assigned to users. Unfortunately, roles are vendor specific. Under Oracle you can test membership with "SET ROLE role_name" statement. You could also query the data dictionary, DBA_ROLE_PRIVS, but under Oracle that requires explicit privilege. Documentation patches for other databases are welcome.

ENVIRONMENT

Applications may access the clear text password as well as the data_source via the environment variables HTTP_MODPERL_DBILOGIN_PASSWORD and HTTP_MODPERL_DBILOGIN_DATA_SOURCE.

 #!/usr/bin/perl -wT
 
 use strict;
 use CGI;
 use DBI;
 my $name = $ENV{REMOTE_USER};
 my $password = $ENV{HTTP_MODPERL_DBILOGIN_PASSWORD};
 my $data_source = $ENV{HTTP_MODPERL_DBILOGIN_DATA_SOURCE};
 my $dbh = DBI->connect($data_source, $name, $password)
        or die "$DBI::err: $DBI::errstr\n";
 ...

SECURITY

The database user's clear text passwd is made available in the server's environment. Do you trust your developers?

BUGS

Probably lots, I'm not the best programmer in the world.

NOTES

Feel free to email me with comments, suggestions, flames. Its the only way I'll become a better programmer.

SEE ALSO

mod_perl(1), Apache::DBI(3), and Apache::AuthDBI(3)

AUTHOR

John Groenveld <groenveld@acm.org>