CGI, attachment, passwordauth: harden against repeated parameters

[git.ikiwiki.info.git] / IkiWiki / Plugin / remove.pm

diff --git a/IkiWiki/Plugin/remove.pm b/IkiWiki/Plugin/remove.pm
index 95f148183cba558be65a95a9687992293d122839..6875844a32fc61a67a7d6eae82c4ed684e2681df 100644 (file)
--- a/IkiWiki/Plugin/remove.pm
+++ b/IkiWiki/Plugin/remove.pm
@@ -22,6 +22,14 @@ sub getsetup () {
                },
 }
 
+sub allowed_dirs {
+       no warnings 'once';
+       return grep { defined $_ } (
+               $config{srcdir},
+               $IkiWiki::Plugin::transient::transientdir,
+       );
+}
+
 sub check_canremove ($$$) {
        my $page=shift;
        my $q=shift;
@@ -33,23 +41,30 @@ sub check_canremove ($$$) {
                        htmllink("", "", $page, noimageinline => 1)));
        }
 
-       # Must exist on disk, and be a regular file.
+       # Must exist in either the srcdir or a suitable underlay (e.g.
+       # transient underlay), and be a regular file.
        my $file=$pagesources{$page};
-       if (! -e "$config{srcdir}/$file") {
+       my $dir;
+
+       foreach my $srcdir (allowed_dirs()) {
+               if (-e "$srcdir/$file") {
+                       $dir = $srcdir;
+                       last;
+               }
+       }
+
+       if (! defined $dir) {
                error(sprintf(gettext("%s is not in the srcdir, so it cannot be deleted"), $file));
        }
-       elsif (-l "$config{srcdir}/$file" && ! -f _) {
+       elsif (-l "$dir/$file" && ! -f _) {
                error(sprintf(gettext("%s is not a file"), $file));
        }
        
-       # Must be editable.
-       IkiWiki::check_canedit($page, $q, $session);
-
        # If a user can't upload an attachment, don't let them delete it.
        # This is sorta overkill, but better safe than sorry.
        if (! defined pagetype($pagesources{$page})) {
                if (IkiWiki::Plugin::attachment->can("check_canattach")) {
-                       IkiWiki::Plugin::attachment::check_canattach($session, $page, "$config{srcdir}/$file");
+                       IkiWiki::Plugin::attachment::check_canattach($session, $page, "$dir/$file");
                }
                else {
                        error("removal of attachments is not allowed");
@@ -74,6 +89,7 @@ sub check_canremove ($$$) {
                        }
                }
        });
+       return defined $canremove ? $canremove : 1;
 }
 
 sub formbuilder_setup (@) {
@@ -102,7 +118,7 @@ sub confirmation_form ($$) {
                method => 'POST',
                javascript => 0,
                params => $q,
-               action => $config{cgiurl},
+               action => IkiWiki::cgiurl(),
                stylesheet => 1,
                fields => [qw{do page}],
        );
@@ -119,12 +135,26 @@ sub removal_confirm ($$@) {
        my $session=shift;
        my $attachment=shift;
        my @pages=@_;
+               
+       # Special case for unsaved attachments.
+       foreach my $page (@pages) {
+               if ($attachment && IkiWiki::Plugin::attachment->can("is_held_attachment")) {
+                       my $f=IkiWiki::Plugin::attachment::is_held_attachment($page);
+                       if (defined $f) {
+                               require IkiWiki::Render;
+                               IkiWiki::prune($f, "$config{wikistatedir}/attachments");
+                       }
+               }
+       }
+       @pages=grep { exists $pagesources{$_} } @pages;
+       return unless @pages;
 
        foreach my $page (@pages) {
+               IkiWiki::check_canedit($page, $q, $session);
                check_canremove($page, $q, $session);
        }
 
-       # Save current form state to allow returning to it later
+       # Save current form state to allow returning to it later
        # without losing any edits.
        # (But don't save what button was submitted, to avoid
        # looping back to here.)
@@ -179,10 +209,10 @@ sub formbuilder (@) {
 }
 
 sub sessioncgi ($$) {
-        my $q=shift;
+       my $q=shift;
 
        if ($q->param("do") eq 'remove') {
-               my $session=shift;
+               my $session=shift;
                my ($form, $buttons)=confirmation_form($q, $session);
                IkiWiki::decode_form_utf8($form);
 
@@ -190,14 +220,15 @@ sub sessioncgi ($$) {
                        postremove($session);
                }
                elsif ($form->submitted eq 'Remove' && $form->validate) {
-                       IkiWiki::checksessionexpiry($q, $session, $q->param('sid'));
+                       IkiWiki::checksessionexpiry($q, $session);
 
                        my @pages=$form->field("page");
-       
+                       
                        # Validate removal by checking that the page exists,
                        # and that the user is allowed to edit(/remove) it.
                        my @files;
                        foreach my $page (@pages) {
+                               IkiWiki::check_canedit($page, $q, $session);
                                check_canremove($page, $q, $session);
                                
                                # This untaint is safe because of the
@@ -210,21 +241,34 @@ sub sessioncgi ($$) {
                        require IkiWiki::Render;
                        if ($config{rcs}) {
                                IkiWiki::disable_commit_hook();
-                               foreach my $file (@files) {
-                                       IkiWiki::rcs_remove($file);
+                       }
+                       my $rcs_removed = 1;
+
+                       foreach my $file (@files) {
+                               foreach my $srcdir (allowed_dirs()) {
+                                       if (-e "$srcdir/$file") {
+                                               if ($srcdir eq $config{srcdir} && $config{rcs}) {
+                                                       IkiWiki::rcs_remove($file);
+                                                       $rcs_removed = 1;
+                                               }
+                                               else {
+                                                       IkiWiki::prune("$srcdir/$file", $srcdir);
+                                               }
+                                       }
                                }
-                               IkiWiki::rcs_commit_staged(
-                                       message => gettext("removed"),
-                                       session => $session,
-                               );
-                               IkiWiki::enable_commit_hook();
-                               IkiWiki::rcs_update();
                        }
-                       else {
-                               foreach my $file (@files) {
-                                       IkiWiki::prune("$config{srcdir}/$file");
+
+                       if ($config{rcs}) {
+                               if ($rcs_removed) {
+                                       IkiWiki::rcs_commit_staged(
+                                               message => gettext("removed"),
+                                               session => $session,
+                                       );
                                }
+                               IkiWiki::enable_commit_hook();
+                               IkiWiki::rcs_update();
                        }
+
                        IkiWiki::refresh();
                        IkiWiki::saveindex();
 
@@ -240,7 +284,7 @@ sub sessioncgi ($$) {
                                if (! exists $pagesources{$parent}) {
                                        $parent="index";
                                }
-                               IkiWiki::redirect($q, urlto($parent, '/', 1));
+                               IkiWiki::redirect($q, urlto($parent));
                        }
                }
                else {