#!/usr/bin/perl -wT

#----------------------------------------------------------------------
# heading     : Security
# description : User Panel Access
# navigation  : 1000 1300
#
# Copyright (c) 2001 Daniel van Raay <danielvr@caa.org.au>
# Modified (c) 2002 Stephen Noble <stephen@dungog.net>
# Modified (c) 2002 Shad L. Lords <slords@mail.com>
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
#----------------------------------------------------------------------

package esmith;

use strict;
use CGI ':all';
use CGI::Carp qw(fatalsToBrowser);

use esmith::cgi;
use esmith::config;
use esmith::util;
use esmith::db;
use esmith::event;

sub showInitial ($$);
sub genPanels ($$);
sub modifyAccess ($);
sub performModifyAccess ($);

BEGIN
{
    # Clear PATH and related environment variables so that calls to
    # external programs do not cause results to be tainted. See
    # "perlsec" manual page for details.

    $ENV {'PATH'} = '';
    $ENV {'SHELL'} = '/bin/bash';
    delete $ENV {'ENV'};
}

esmith::util::setRealToEffective ();

$CGI::POST_MAX=1024 * 100;  # max 100K posts
$CGI::DISABLE_UPLOADS = 1;  # no uploads

my %conf;
tie %conf, 'esmith::config';

my %accounts;
tie %accounts, 'esmith::config', '/home/e-smith/db/accounts';

#------------------------------------------------------------
# examine state parameter and display the appropriate form
#------------------------------------------------------------

my $q = new CGI;

if (! grep (/^state$/, $q->param))
{
    showInitial ($q, '');
}

elsif ($q->param ('state') eq "modifyAccess")
{
    modifyAccess ($q);
}

elsif ($q->param ('state') eq "performModifyAccess")
{
    performModifyAccess ($q);
}

else
{
    esmith::cgi::genStateError ($q, \%conf);
}

exit (0);

#------------------------------------------------------------
# subroutine to display initial form
#------------------------------------------------------------

sub showInitial ($$)
{
    my ($q, $msg) = @_;

    if ($msg eq '')
    {
    esmith::cgi::genHeaderNonCacheable
        ($q, \%conf, 'Change access to server-manager panels for user accounts');
    }
    else
    {
    esmith::cgi::genHeaderNonCacheable
        ($q, \%conf, 'Operation status report');

    print $q->p ($msg);
    print $q->hr;
    }

    my @userAccounts = ('admin');

    foreach (sort keys %accounts)
    {
      push (@userAccounts, $_) if (db_get_type(\%accounts, $_) eq "user");
    }

    foreach (sort keys %accounts)
    {
      push (@userAccounts, $_) if (db_get_type(\%accounts, $_) eq "group");
    }

    unless (scalar @userAccounts)
    {
      print $q->p ($q->b ('There are no user accounts in the system.'));
    }
    else
    {
      my $description = <<END_TEXT;
You can modify individual users access to the server-manager
panels below by clicking on the link next the account. You can assign
panels to the members of a group with their link. Users or Groups
in red have some form of extra access. You can globally assign
a panel by editing the global account
END_TEXT

      print $q->p ($description);

      print $q->p ($q->b ('Current List of User Accounts'));

      print "<table border=1 cellspacing=1 cellpadding=4>";

      print $q->Tr (esmith::cgi::genSmallCell ($q, $q->b ('Account')),
                esmith::cgi::genSmallCell ($q, $q->b ('Name/Description')),
                $q->td ('&nbsp;'));

      my $user;

      foreach $user (@userAccounts)
      {
          my $name = '';
          if (db_get_type(\%accounts, $user) eq "group")
          {
              $name =db_get_prop(\%accounts, $user, "Description");
          }
          else
          {
              $name =db_get_prop(\%accounts, $user, "FirstName")." ". db_get_prop(\%accounts, $user, "LastName");
          }

          my $AdminPanels = db_get_prop(\%accounts, $user, "AdminPanels");
          $AdminPanels = '' if ! defined ($AdminPanels);

          if ( ! $AdminPanels )
          {
          print $q->Tr (esmith::cgi::genSmallCell ($q, $user),
                    esmith::cgi::genSmallCell ($q, $name),
                    esmith::cgi::genSmallCell ($q,
                  $q->a ({href => $q->url (-absolute => 1)
                           . "?state=modifyAccess&acct="
                           . $user}, 'Change Access...')));

          }
          else
          {
          print $q->Tr (esmith::cgi::genSmallRedCell ($q, $user),
                    esmith::cgi::genSmallRedCell ($q, $name),
                    esmith::cgi::genSmallCell ($q,
                  $q->a ({href => $q->url (-absolute => 1)
                           . "?state=modifyAccess&acct="
                           . $user}, 'Change Access...')));

          }

      }

      #global setting
      if ( ! db_get( \%accounts, 'globalUP') )
      {
          db_set(\%accounts, 'globalUP', 'userpanelglobal', { FirstName => 'global user', LastName => 'panel access' });
      }

      my $AdminPanels = db_get_prop(\%accounts, 'globalUP', "AdminPanels");
      $AdminPanels = '' if ! defined ($AdminPanels);

      if ( ! $AdminPanels )
      {
        print $q->Tr (esmith::cgi::genSmallCell ($q, 'Global'),
                esmith::cgi::genSmallCell ($q, 'every user'),
                esmith::cgi::genSmallCell ($q,
              $q->a ({href => $q->url (-absolute => 1)
                       . "?state=modifyAccess&acct="
                       . 'globalUP'}, 'Change Access...')));

      }
      else
      {
        print $q->Tr (esmith::cgi::genSmallRedCell ($q, 'Global'),
                esmith::cgi::genSmallRedCell ($q, 'every user'),
                esmith::cgi::genSmallCell ($q,
              $q->a ({href => $q->url (-absolute => 1)
                       . "?state=modifyAccess&acct="
                       . 'globalUP'}, 'Change Access...')));

      }

      print '</table>';
    }

    esmith::cgi::genFooter ($q);
}

sub genPanels ($$)
{
    my ($q, $user) = @_;

    my %panelshash =  ();
    my @selected =    ();
    my @globalselected =    ();

    my @panels;
    opendir (DIR, "/etc/e-smith/web/functions")
        || die "Can't open /etc/e-smith/web/functions directory.\n";
    push (@panels, sort (grep (!/^(\.|userpanel-initial|userpanel-navigation|userpanel-noframes|pleasewait|index\.cgi|initial\.cgi|navigation|noframes)/, readdir(DIR))));
    closedir (DIR);

    my $panel;
    foreach $panel (@panels)
    {
        $panelshash{$panel} = "Unknown";

        unless (open (RD, "/etc/e-smith/web/functions/$panel"))
        {
            warn "Can't open file /etc/e-smith/web/functions/$panel: $!\n";
            next;
        }

        while (<RD>)
        {
            if (/^\s*#\s*description\s*:\s*(.+?)\s*$/)
            {
                $panelshash{$panel} = $1;
            }

            last if ( $panelshash{$panel} ne "Unknown" );
        }
        close RD;
    }

    my $userAdminPanels = db_get_prop(\%accounts, $user, 'AdminPanels');
    $userAdminPanels = '' if ! defined ($userAdminPanels);
    @selected = split (/,/, $userAdminPanels);

    my $globalAdminPanels = db_get_prop(\%accounts, 'globalUP', 'AdminPanels');
    $globalAdminPanels = '' if ! defined ($globalAdminPanels);
    @globalselected = split (/,/, $globalAdminPanels);

    @panels = sort @panels;
    my $count = scalar @panels;

    my $out = '';

    if ($count > 0)
    {
    $out .= '<table border=1 cellspacing=1 cellpadding=4>';

    $out .= $q->Tr ($q->td ('&nbsp;'),
                esmith::cgi::genSmallCell ($q, $q->b ('Panel')),
                esmith::cgi::genSmallCell ($q, $q->b ('Description')));

    my $panel;
    foreach $panel (@panels)
    {
        my $checked = "";
        if (grep (/^$panel$/, @selected) || grep (/^$panel$/, @globalselected))
        {
          $checked = "checked";
        }

        if (grep (/^$panel$/, @globalselected) && ($user ne 'globalUP'))
        {
            $out .=
            $q->Tr (
                $q->td (
                    "<input type=\"checkbox\""
                    . " name=\"panelAccess\""
                    . " $checked value=\"$panel\">"
                    ),
                    esmith::cgi::genSmallRedCell ($q, $panel),
                    esmith::cgi::genSmallRedCell (
                    $q, $panelshash{$panel} . ' (Global)'));
        } else {
            $out .=
            $q->Tr (
                $q->td (
                    "<input type=\"checkbox\""
                    . " name=\"panelAccess\""
                    . " $checked value=\"$panel\">"
                    ),
                    esmith::cgi::genSmallCell ($q, $panel),
                    esmith::cgi::genSmallCell (
                    $q, $panelshash{$panel}));
        }
    }

    $out .= '</table>';
    }

    return $out;
}


sub modifyAccess ($)
{
    my ($q) = @_;

    esmith::cgi::genHeaderNonCacheable ($q, \%conf, 'Modify user-manager access');

    print
    $q->startform (-method => 'POST', -action => $q->url (-absolute => 1));

    my $acct = $q->param ('acct');

    my $username = '';
    if (db_get_type(\%accounts, $acct) eq "group")
    {
        $username =db_get_prop(\%accounts, $acct, "Description");
    }
    else
    {
        $username =db_get_prop(\%accounts, $acct, "FirstName")." ". db_get_prop(\%accounts, $acct, "LastName");
    }

    if (db_get(\%accounts, $acct))
    {

       print $q->table ({border => 0, cellspacing => 0, cellpadding => 4},

            $q->Tr (esmith::cgi::genCell ($q, "Account name:"),
                esmith::cgi::genCell ($q, $acct)),

            $q->Tr (esmith::cgi::genCell ($q, "Name/Description:"),
                esmith::cgi::genCell ($q, "$username")),

            $q->Tr (esmith::cgi::genCell ($q, "Accessible Panels:"),
                esmith::cgi::genCell ($q, genPanels ($q, $acct))),

            esmith::cgi::genButtonRow ($q,
                                   $q->submit (-name => 'action',
                                               -value => 'Modify')));

       print $q->hidden (-name => 'acct',
              -override => 1,
              -default => $acct);

       print $q->hidden (-name => 'state',
              -override => 1,
              -default => 'performModifyAccess');

    }

    print $q->endform;
    esmith::cgi::genFooter ($q);
    return;
}


sub performModifyAccess ($)
{
    my ($q) = @_;
    my $acct = $q->param ('acct');

    my @adminPanels = $q->param ('panelAccess');
    my @userPanels = ();

    my $globalAdminPanels = db_get_prop(\%accounts, 'globalUP', 'AdminPanels');
    $globalAdminPanels = '' if ! defined ($globalAdminPanels);
    my @globalselected = split (/,/, $globalAdminPanels);

    foreach my $panel (@adminPanels)
    {
        if ( ! grep (/^$panel$/, @globalselected) || ($acct eq 'globalUP'))
        {
            push(@userPanels, $panel);
        }
    }

    my $adminPanels = join (',', @userPanels);

    db_set_prop(\%accounts, $acct, 'AdminPanels', $adminPanels);

    system ("/sbin/e-smith/signal-event", "conf-userpanel") == 0
       or die ("Error occurred while updating userpanel configuration.\n");

    showInitial ($q, "Successfully modified user account $acct.");
}