#!/usr/bin/perl 

use strict;
use diagnostics;
use lib qw(/usr/lib/libDrakX);
use standalone;

use common;
use ugtk2 qw(:helpers :wrappers :create);
use interactive;

my $in = 'interactive'->vnew('su');
local $_ = join '', @ARGV;

#- vars declaration
my ($level) = chomp_(`cat /etc/sysconfig/msec | grep SECURE_LEVEL= |cut -d= -f2`);
my ($default_perm_level) = "level " . $level;
my %perm_files = ($default_perm_level => '/usr/share/msec/perm.' . $level,
                  'editable' => '/etc/security/msec/perm.local',
                 );

my %perm_l10n = ($default_perm_level => N("System settings"),
                 'editable' => N("Custom settings"),
                 'all' => N("Custom & system settings"),
                );
my %rev_perm_l10n = reverse %perm_l10n;
my ($editable, $modified) = (0, 0);

my @rules;

#- Widget declaration
my $w = ugtk2->new('drakperm');
$w->{rwindow}->set_size_request(620, 400) unless $::isEmbedded;
my $W = $w->{window};
$W->signal_connect(delete_event => sub { ugtk2->exit });
my $model = Gtk2::ListStore->new("Gtk2::Gdk::Pixbuf", ("Glib::String") x 5);
my $permList = Gtk2::TreeView->new_with_model($model);

my $pixbuf = gtkcreate_pixbuf('non-editable');

my @column_sizes = (150, 100, 100, 15, -1);

# TreeView layout is (Editable, Path, User, Group, Permissions, [hidden]index_id)
$permList->append_column(Gtk2::TreeViewColumn->new_with_attributes(N("Editable"), Gtk2::CellRendererPixbuf->new, 'pixbuf' => 0));
each_index {
    my $col = Gtk2::TreeViewColumn->new_with_attributes($_, Gtk2::CellRendererText->new, 'text' => $::i + 1);
    $col->set_min_width($column_sizes[$::i+1]);
    $permList->append_column($col);
} (N("Path"), N("User"), N("Group"), N("Permissions"));

load_perms();

#- widgets settings
my $combo_perm = new Gtk2::OptionMenu;
$combo_perm->set_popdown_strings(sort(values %perm_l10n));

sub add_callback() {
    row_setting_dialog();
    $modified++;
}

sub edit_callback() {
    my (undef, $iter) = $permList->get_selection->get_selected;
    return unless $iter;
    row_setting_dialog($iter);
}

my @buttons;

sub del_callback() {
    my ($tree, $iter) = $permList->get_selection->get_selected;
    my $removed_idx = $tree->get($iter, 5);
    @rules = grep { $_->{index} ne $removed_idx } @rules;
    $tree->remove($iter);
    sensitive_buttons(0);
    $modified++;
}

sub move_callback {
    my ($direction) = @_;
    my ($model, $iter) = $permList->get_selection->get_selected;
    return if !$iter;
    my $path = $model->get_path($iter) or return;
    $direction eq 'up' ? $path->prev : $path->next;
    my $iter2 = $model->get_iter($path);
    return if !$iter2 || $model->get($iter2, 0);
    $model->swap($iter, $iter2);
    $modified = 1;
    hide_up_button_iffirst_item($path);
    hide_down_button_iflast_item($path);
    $permList->get_selection->select_iter($iter);
    $permList->queue_draw;
}

$permList->signal_connect(button_press_event => sub { 
                     return unless $editable;
                     my (undef, $event) = @_;
                     my (undef, $iter) = $permList->get_selection->get_selected;
                     return unless $iter;
                     row_setting_dialog($iter) if $event->type eq '2button-press';
                 });


my $tips = new Gtk2::Tooltips;

$W->add(gtkpack_(Gtk2::VBox->new(0,5),
                 0, gtkset_property(Gtk2::Label->new(N("Drakperm is used to see files to use in order to fix permissions, owners, and groups via msec.\nYou can also edit your own rules which will owerwrite the default rules.")), 'wrap', 1),
                 1, gtkadd(Gtk2::Frame->new,
                           gtkpack_(Gtk2::VBox->new(0,5),
                                    0, gtkadd(Gtk2::HBox->new(0,5),
                                              Gtk2::Label->new(N("The current security level is %s
Select permissions to see/edit", $level)),
                                              $combo_perm
                              ),
                                    1, create_scrolled_window($permList),
                                    0, my $up_down_box = gtkadd(Gtk2::HBox->new(0, 5), @buttons =
                                                                map {
                                                                    gtkset_tip($tips, 
                                                                               gtksignal_connect(Gtk2::Button->new($_->[0]), clicked => $_->[2]),
                                                                               $_->[1]);
                                                                } ([ N("Up"), N("Move selected rule up one level"), sub { move_callback('up') } ], 
                                                                   [ N("Down"), N("Move selected rule down one level"), sub { move_callback('down') } ], 
                                                                   [ N("Add a rule"), N("Add a new rule at the end"), \&add_callback ],
                                                                   [ N("Delete"), N("Delete selected rule"), \&del_callback ], 
                                                                   [ N("Edit"), N("Edit current rule"), \&edit_callback ])),
                                    0, gtkpack(Gtk2::HButtonBox->new,
                                               gtksignal_connect(Gtk2::Button->new(N("Help")), clicked => 
                                                                 sub { unless (fork()) { exec("drakhelp --id drakperm") } }),
                                               Gtk2::Label->new(""),
                                               gtksignal_connect(Gtk2::Button->new(N("Cancel")), clicked => sub { ugtk2->exit }),
                                               gtksignal_connect(Gtk2::Button->new(N("Ok")), clicked => \&save_perm),
                              )
                       )
                 )
          )
       );
$W->show_all;
$w->{rwindow}->set_position('center') unless $::isEmbedded;

$combo_perm->entry->set_text($perm_l10n{all});
display_perm('all');
my $combo_sig = $combo_perm->entry->signal_connect(changed => sub { display_perm($rev_perm_l10n{$combo_perm->entry->get_text} , @_) });

$permList->get_selection->signal_connect('changed' => sub {
                                               my ($select) = @_;
                                               my (undef, $iter) = $select->get_selected;
                                               return if !$iter;
                                               my $locked = $model->get($iter, 0);
                                               sensitive_buttons($iter ? $editable && !$locked : 0);
                                               return if $locked;
                                               my $curr_path = $model->get_path($iter);
                                               hide_up_button_iffirst_item($curr_path);
                                               hide_down_button_iflast_item($curr_path);
                                           });

$w->main;
ugtk2->exit;


sub hide_up_button_iffirst_item {
    my ($curr_path) = @_;
    my $first_path = $model->get_path($model->get_iter_first);
    $buttons[0]->set_sensitive($first_path && $first_path->compare($curr_path));
}

sub hide_down_button_iflast_item {
    my ($curr_path) = @_;
    $curr_path->next;
    my $next_item = $model->get_iter($curr_path);
    $buttons[1]->set_sensitive($next_item && !$model->get($next_item, 0));
}


sub display_perm {
    my ($perm_level) = @_;
    return unless $perm_level;
    my $show_sys_rules  = $perm_level eq $default_perm_level;
    my $show_user_rules = $perm_level eq 'editable';
    my $show_all_rules  = $perm_level eq 'all';
    # cleaner way: only remove filtered out rules, add those not any more filtered rather than refilling the whole tree
    $model->clear;
    foreach my $rule (@rules) {
        next if !$show_all_rules && ($show_user_rules && $rule->{editable} || $show_sys_rules && !$rule->{editable});
        $model->append_set(map_index { if_(defined $rule->{$_}, $::i => $rule->{$_}) } qw(editable path user group perms index));
    };

    # alter button box behavior
    $editable = $perm_level =~ /^level \d/ ? 0 : 1;
    $up_down_box->set_sensitive($editable);
    sensitive_buttons(0) if $editable;
}

sub save_perm() {
    my $val;
    if ($modified) {
        local *F;
        open F, '>' . $perm_files{editable} or die("Impossible to process \"", $perm_files{editable}, "\"");
        $model->foreach(sub {
                            my ($model, $_path, $iter) = @_;
                            return 0 if $model->get($iter, 0);
                            my $line = $model->get($iter, 1) . "\t" . $model->get($iter, 2) . ($model->get($iter, 3) ? "." . $model->get($iter, 3) : "") . "\t" . $model->get($iter, 4) . "\n";
                            print F $line;
                            return 0;
                        }, $val);
        close F;
    }
    $modified = 0;
    ugtk2->exit;
}

sub load_perms() {
    my $index = 0;
    foreach my $file (@perm_files{($default_perm_level, 'editable')}) {
        local *F;
        open F, $file;
        
        my @editable = if_($file ne $perm_files{editable}, editable => $pixbuf);
        local $_;
        while (<F>) {
            next if /^#/;
            # Editable, Path, User, Group, Permissions
            if (m/^(\S+)\s+([^.\s]+)\.(\S+)?\s+(\d+)/) {
                push @rules, { @editable, path => $1, user => $2, group => $3, perms => $4, index => $index };
            } elsif (m/^(\S+)\s+current?\s+(\d+)/) {
                push @rules, { @editable, path => $1, user => 'current', group => '', perms => $2, index => $index };
            } else {
                warn "unparsable \"$_\"line";
            }
            $index++;
        }
        close F;
    }
}

sub row_setting_dialog {
    my ($iter) = @_;
    
    my $dlg         = new Gtk2::Dialog();
    $dlg->set_transient_for($w->{rwindow}) unless $::isEmbedded;
    $dlg->set_modal(1);
#    $dlg->set_resizable(0);
    my $ok          = Gtk2::Button->new(N("Ok"));
    my $cancel      = Gtk2::Button->new(N("Cancel"));
    my $browse = new Gtk2::Button(N("browse"));
    my $file        = new Gtk2::Entry;
    my ($other, $group, $user, $s) = reverse(split(//, $model->get($iter, 4))) if $iter;
    my @bits = qw(sticky gid suid);
    my @rights = qw(read write execute);
    my @owners = qw(user group other);
    
    my %rights = (user => $user, group => $group, other => $other);
    my %rights_labels = (user => N("User"), group => N("Group"), other => N("Other"));
    my %checks = ('read' => {
                             label => N("Read"),
                             tip => { map { $_ => N("Enable \"%s\" to read the file", $_) } keys %rights },
                            },
                  'write' => {
                              label => N("Write"),
                              tip => { map { $_ => N("Enable \"%s\" to write the file", $_) } keys %rights },
                             },
                  'execute' => {
                                label => N("Execute"),
                                tip => { map { $_ => N("Enable \"%s\" to execute the file", $_) } keys %rights },
                               },
                  sticky => { label => N("Sticky-bit"), tip => N("Used for directory:\n only owner of directory or file in this directory can delete it") },
                  suid => { label => N("Set-UID"), tip => N("Use owner id for execution") },
                  gid => { label => N("Set-GID"), tip => N("Use group id for execution") },
                 );

    #- dlg widgets settings
    my %s_right = get_right($s);
     
    $file->set_text($model->get($iter, 1)) if $iter;

    my $users  = Gtk2::OptionMenu->new;
    $users->set_popdown_strings(&get_user_or_group('users'));
    $users->entry->set_text($model->get($iter, 2)) if $iter;
     
    my $groups = Gtk2::OptionMenu->new;
    $groups->set_popdown_strings(&get_user_or_group);
    $groups->entry->set_text($model->get($iter, 3)) if $iter;

    my $id_box = gtkadd(Gtk2::HBox->new(0,5),
                        Gtk2::Label->new(N("User :")),
                        $users,
                        Gtk2::Label->new(N("Group :")),
                        $groups,
                       );

    my $usr_check = gtksignal_connect(gtkset_tip($tips, Gtk2::CheckButton->new(N("Current user")),
                                                 N("When checked, owner and group won't be changed")),
                                      clicked => sub { $id_box->set_sensitive($_[0]->get_active) });
     
    if ($iter && $model->get($iter, 2) eq 'current') {
     $usr_check->set_active(1);
     $groups->set_sensitive(0);
     $users->set_sensitive(0);
    }
     
     
    $cancel->signal_connect(clicked => sub { $dlg->destroy });
    $browse->signal_connect(clicked => sub {
                     my $file_dlg = new Gtk2::FileSelection(N("Path selection"));
                     $file_dlg->set_modal(1);
                     $file_dlg->set_transient_for($dlg);
                     $file_dlg->show;
                     $file_dlg->set_filename($file->get_text);
                     $file_dlg->cancel_button->signal_connect(clicked => sub { $file_dlg->destroy });
                     $file_dlg->ok_button->signal_connect(clicked => sub {
                                                $file->set_text($file_dlg->get_filename);
                                                $file_dlg->destroy;
                                               });
                    });
    my %perms;
    $ok->signal_connect(clicked => sub {
                            # create new item if needed (that is when adding a new one) at end of list
                            $iter ||= $model->append;
                            $model->set($iter, 1 => $file->get_text);
                            if ($usr_check->get_active) {
                                $model->set($iter, 2 => 'current');
                                $model->set($iter, 3 => '');
                            } else {
                                $model->set($iter, 2 => $users->entry->get_text);
                                $model->set($iter, 3 => $groups->entry->get_text);
                            }
                            $model->set($iter, 4 => sprintf("%o", eval(join('', "0b",
                                                                            (map { $perms{$_}->get_active || 0 } reverse @bits),
                                                                            (map { my $owner = $_;map_index { $perms{$owner}{$_}->get_active || 0 } @rights } @owners)))));
                            $dlg->destroy;
                            $modified++;
                        });

    gtkpack_($dlg->vbox,
             0, gtkadd(Gtk2::Frame->new(N("Path")),
                       gtkpack_(Gtk2::HBox->new(0,5),
                                1, $file,
                                0, $browse
                               )
                      ),
             0, gtkadd(Gtk2::Frame->new(N("Property")),
                       gtkadd(Gtk2::VBox->new(0,5),
                              $usr_check,
                              $id_box,
                             ),
                      ),
             1, gtkadd(Gtk2::Frame->new(N("Permissions")),
                       gtkpack(Gtk2::HBox->new(0,15),
                               gtkadd(Gtk2::VBox->new(0,15),
                                      Gtk2::Label->new(""),
                                      map { gtkset_tip($tips, Gtk2::Label->new($checks{$_}{label}), $checks{$_}{tip}) } @rights,
                                     ),
                               (map {
                                   my $owner = $_;
                                   $perms{$owner} = { get_right($rights{$owner}) };
                                   my $vbox = gtkadd(Gtk2::VBox->new(0,5), 
                                                     Gtk2::Label->new($rights_labels{$owner}),
                                                     map {
                                                         my $c = $_;
                                                         my $active = $perms{$owner}{$c};
                                                         $perms{$owner}{$c} = Gtk2::CheckButton->new;
                                                         $tips->set_tip($perms{$owner}{$c},
                                                                        $checks{$c}{tip}{$owner},
                                                                       );
                                                         gtkset_active($perms{$owner}{$c}, $active);
                                                     } @rights,
                                                    );
                                   
                                   $vbox;
                               } @owners),
                               gtkpack(Gtk2::VBox->new(0,5),
                                       Gtk2::Label->new(' '),
                                       map { $perms{$_} = gtkset_tip($tips, Gtk2::CheckButton->new($checks{$_}{label}), $checks{$_}{tip}) } @bits,
                                      ),
                              ),
                      ),
            );
    $perms{sticky}->set_active($s_right{execute});
    $perms{gid}->set_active($s_right{write});
    $perms{suid}->set_active($s_right{read});

    gtkadd($dlg->action_area,
           $cancel,
           $ok
          );
     
    $dlg->show_all;

}

sub get_user_or_group {
    my $what = @_;
    my @users;
    local *F;
    open F, $what eq 'users' ? '/etc/passwd' : '/etc/group';
     
    local $_;
    while (<F>) {
     m/^([^#:]+):[^:]+:[^:]+:/ or next;
     push @users, $1;
    }
    close F;
    return sort(@users);
}

sub get_right {
    my ($right) = @_;
    my %rght   = ('read' => 0, 'write' => 0, 'execute' => 0);
    $right - 4 >= 0 and $rght{read}=1 and $right = $right-4;
    $right - 2 >= 0 and $rght{write}=1 and $right = $right-2;
    $right - 1 >= 0 and $rght{execute}=1 and $right = $right-1;
    return %rght;
}

sub sensitive_buttons {
    foreach my $i (0, 1, 3, 4) {
        $buttons[$i]->set_sensitive($_[0]);
    }
}