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############################################################################### |
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# Perl Module WWW::Authenticate |
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# |
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# copyright 2001 D. Scott Barninger |
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# copyright 2001 Chris Fleizach |
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# licensed under the GNU General Public License ver. 2.0 |
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# see the accompaning LICENSE file |
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############################################################################### |
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package WWW::Authenticate; |
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use strict; |
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BEGIN { |
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use vars qw($VERSION @ISA @EXPORT); |
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use DBI; |
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require Exporter; |
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@ISA = qw(Exporter); |
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# exported functions |
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@EXPORT = qw( |
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&CheckAuth |
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&GetSessionCookie |
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&Login |
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&Logout); |
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$VERSION = '0.6.0'; |
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} |
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# package globals |
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use vars qw($dbh); |
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$dbh = ""; |
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################################################################################ |
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# FUNCTION: CheckAuth($dsn,$sql_username,$sql_password,$sql_table,$session) |
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# DESCRIPTION: authenticates the user using current session number |
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################################################################################ |
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sub CheckAuth |
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{ |
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my ($dsn,$sql_username,$sql_password,$sql_table,$session) = @_; |
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my $SQL = qq| select session from $sql_table where session = "$session" |; |
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$dbh = Connect($dsn,$sql_username,$sql_password); |
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my $sth = DatabaseQuery($dbh,$SQL); |
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my ($t_session) = $sth->fetchrow_array(); |
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$dbh->disconnect(); |
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50
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if (!$t_session) { |
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return 0; |
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} |
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else { |
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return 1; |
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} |
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} |
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59
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################################################################################ |
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# FUNCTION: Cleanup |
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# DESCRIPTION: To be called when exiting |
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################################################################################ |
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sub Cleanup |
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{ |
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$dbh->disconnect(); |
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exit(0); |
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} |
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################################################################################ |
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# FUNCTION: Connect($dsn,$sql_username,$sql_password) |
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# DESCRIPTION: Connect to the MySQL database |
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################################################################################ |
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sub Connect |
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{ |
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my ($dsn,$sql_username,$sql_password) = @_; |
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$dbh = DBI->connect($dsn,$sql_username,$sql_password) |
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or ErrorMessage("Could not connect to the database."); |
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return $dbh; |
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} |
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################################################################################ |
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# FUNCTION: CreateSession |
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# DESCRIPTION: gets info in cookies |
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################################################################################ |
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sub CreateSession |
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{ |
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my $size=int(rand(256)+255); |
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my $chars = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ0123456789"; |
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my @array= split(//,$chars); |
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my @dots = (); |
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while($size--){ |
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push @dots,$array[rand(@array)]; |
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} |
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my $line = ""; |
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foreach (@dots) { |
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if (int(rand(time^$$)) % 2 == 0) { |
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$line .= $_; |
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} |
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} |
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102
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my $add = ""; |
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for (my $k = 0; $k < 40; $k++) { |
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my $n1 = int(rand(length($line))); |
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my $sub = substr($line,$n1,1); |
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$add .= "$sub$n1"; |
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} |
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109
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my $session = int(rand(99999999)) . crypt(time*rand(999),"YT") . $add . |
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crypt(rand(730300334) * rand(31443),"EP"); |
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return $session; |
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} |
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################################################################################ |
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# FUNCTION: DatabaseQuery($dbh,$SQL) |
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# DESCRIPTION: Allows for a query to the database, for a general query |
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# If they didn't send a where clause, we have to ignore it |
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# Returns a sth handle so that the user can define what the sth |
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# fetchrow_array should return |
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################################################################################ |
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sub DatabaseQuery |
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{ |
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my ($dbh,$SQL) = @_; |
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my $sth = $dbh->prepare($SQL) || ErrorMessage($SQL); |
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$sth->execute() || ErrorMessage($SQL); |
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return $sth; |
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} |
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129
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################################################################################ |
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# FUNCTION: ErrorMessage |
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# DESCRIPTION: When something fails should print the error message that is |
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# passed and we also output to a log. Then we call Cleanup and |
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# exit the program |
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################################################################################ |
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135
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sub ErrorMessage |
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{ |
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my $message = shift; |
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print qq|$message\n$DBI::err ($DBI::errstr)|; |
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Cleanup(); |
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} |
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142
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################################################################################ |
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143
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# FUNCTION: GetSessionCookie |
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144
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# DESCRIPTION: gets info in cookies |
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145
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################################################################################ |
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146
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sub GetSessionCookie |
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147
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{ |
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148
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use CGI qw/:standard/; |
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149
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use CGI::Cookie; |
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150
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# fetch existing cookies |
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my %cookies = fetch CGI::Cookie; |
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my ($session,$id); |
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if ($cookies{'session'}) { $session = $cookies{'session'}->value; } |
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if ($cookies{'id'}) { $id = $cookies{'id'}->value; } |
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return ($session,$id); |
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156
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} |
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158
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################################################################################ |
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159
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# FUNCTION: Login($dsn,$sql_username,$sql_password,$sql_table,$username,$password) |
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# DESCRIPTION: The user will log in, sending the username and password |
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################################################################################ |
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162
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sub Login |
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{ |
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164
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my ($dsn,$sql_username,$sql_password,$sql_table,$username,$password) = @_; |
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165
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my $SQL = qq| select id from $sql_table where user_name = "$username" and |
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password = "$password" |; |
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$dbh = Connect($dsn,$sql_username,$sql_password); |
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my $sth = DatabaseQuery($dbh,$SQL); |
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169
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my ($uid) = $sth->fetchrow_array(); |
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170
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171
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# if we pass this condition, the user has logged in, so retrieve information |
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if (!$uid) { |
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173
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$dbh->disconnect(); |
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174
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return 0; |
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175
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} |
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176
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else { |
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$dbh->disconnect(); |
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178
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LoginTheUser($dsn,$sql_username,$sql_password,$sql_table,$uid); |
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} |
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} |
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182
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################################################################################ |
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183
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# FUNCTION: LoginTheUser |
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184
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# DESCRIPTION: process screen |
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185
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################################################################################ |
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186
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sub LoginTheUser |
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187
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{ |
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188
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my ($dsn,$sql_username,$sql_password,$sql_table,$uid) = @_; |
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189
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my $session = CreateSession(); |
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190
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$dbh = Connect($dsn,$sql_username,$sql_password); |
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191
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my $SQL = qq| update $sql_table set session="$session" where id = "$uid" |; |
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192
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my $sth = DatabaseQuery($dbh,$SQL); |
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193
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SetSessionCookie($session,$uid); |
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194
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$dbh->disconnect(); |
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195
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return 1; |
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196
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} |
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197
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198
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################################################################################ |
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199
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# FUNCTION: Logout($dsn,$sql_username,$sql_password,$sql_table,$session,$uid) |
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200
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# DESCRIPTION: The user will be logged out deleting the session value in the DB |
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201
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################################################################################ |
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202
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sub Logout |
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203
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{ |
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204
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my ($dsn,$sql_username,$sql_password,$sql_table,$session,$uid) = @_; |
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205
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my $SQL = qq| SELECT session FROM $sql_table WHERE session = "$session" AND |
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206
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id = "$uid" |; |
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207
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$dbh = Connect($dsn,$sql_username,$sql_password); |
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208
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my $sth = DatabaseQuery($dbh,$SQL); |
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209
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my ($db_session) = $sth->fetchrow_array(); |
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210
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if (!$db_session) { |
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211
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$dbh->disconnect(); |
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212
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return 0; |
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213
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} |
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214
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else { |
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215
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my $SQL = qq| update $sql_table set session="NULL" where session = "$session" |
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216
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|
and id = "$uid" |; |
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217
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218
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|
my $sth = DatabaseQuery($dbh,$SQL); |
|
219
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|
$dbh->disconnect(); |
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220
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} |
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221
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} |
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222
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|
223
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|
|
################################################################################ |
|
224
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|
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|
|
# FUNCTION: SetSessionCookie |
|
225
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|
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|
|
# DESCRIPTION: sets session of admin with a cookie |
|
226
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|
|
################################################################################ |
|
227
|
|
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|
|
sub SetSessionCookie |
|
228
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|
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|
|
{ |
|
229
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|
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|
|
my ($session,$id) = @_; |
|
230
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|
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|
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|
|
use CGI qw/:standard/; |
|
231
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|
|
use CGI::Cookie; |
|
232
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|
|
my $cookie1 = new CGI::Cookie(-name=>'session',-value=>$session); |
|
233
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|
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|
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|
|
my $cookie2 = new CGI::Cookie(-name=>'id',-value=>$id); |
|
234
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|
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|
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|
235
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|
|
|
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|
|
print header(-Cookie=>[$cookie1,$cookie2],-type=>"text/html"); |
|
236
|
|
|
|
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|
|
} |
|
237
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|
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|
238
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|
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|
|
1; |
|
239
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|
|
__END__ |