Bug 756550: Do not link a bug alias with its bug ID for bugs you cannot see

Bugzilla/Bug.pm

@@ -358,12 +358,14 @@ sub check {
 
     # Bugzilla::Bug throws lots of special errors, so we don't call
     # SUPER::check, we just call our new and do our own checks.
-    my $self = $class->new(trim($id));
-    # For error messages, use the id that was returned by new(), because
-    # it's cleaned up.
-    $id = $self->id;
+    $id = trim($id);
+    my $self = $class->new($id);
 
     if ($self->{error}) {
+        # For error messages, use the id that was returned by new(), because
+        # it's cleaned up.
+        $id = $self->id;
+
         if ($self->{error} eq 'NotFound') {
              ThrowUserError("bug_id_does_not_exist", { bug_id => $id });
         }
@@ -375,7 +377,7 @@ sub check {
     }
 
     unless ($field && $field =~ /^(dependson|blocked|dup_id)$/) {
-        $self->check_is_visible;
+        $self->check_is_visible($id);
     }
     return $self;
 }
@@ -391,16 +393,19 @@ sub check_for_edit {
 }
 
 sub check_is_visible {
-    my $self = shift;
+    my ($self, $input_id) = @_;
+    $input_id ||= $self->id;
     my $user = Bugzilla->user;
 
     if (!$user->can_see_bug($self->id)) {
         # The error the user sees depends on whether or not they are
         # logged in (i.e. $user->id contains the user's positive integer ID).
+        # If we are validating an alias, then use it in the error message
+        # instead of its corresponding bug ID, to not disclose it.
         if ($user->id) {
-            ThrowUserError("bug_access_denied", { bug_id => $self->id });
+            ThrowUserError("bug_access_denied", { bug_id => $input_id });
         } else {
-            ThrowUserError("bug_access_query", { bug_id => $self->id });
+            ThrowUserError("bug_access_query", { bug_id => $input_id });
         }
     }
 }
@@ -1471,9 +1476,7 @@ sub _check_dependencies {
             : split(/[\s,]+/, $deps_in{$type});
         # Eliminate nulls.
         @bug_ids = grep {$_} @bug_ids;
-        # We do this up here to make sure all aliases are converted to IDs.
-        @bug_ids = map { $invocant->check($_, $type)->id } @bug_ids;
-       
+
         my @check_access = @bug_ids;
         # When we're updating a bug, only added or removed bug_ids are 
         # checked for whether or not we can see/edit those bugs.
@@ -1503,7 +1506,8 @@ sub _check_dependencies {
                 }
             }
         }
-        
+        # Replace all aliases by their corresponding bug ID.
+        @bug_ids = map { $_ =~ /^(\d+)$/ ? $1 : $invocant->check($_, $type)->id } @bug_ids;
         $deps_in{$type} = \@bug_ids;
     }
 
@@ -1520,8 +1524,9 @@ sub _check_dependencies {
 sub _check_dup_id {
     my ($self, $dupe_of) = @_;
     my $dbh = Bugzilla->dbh;
-    
-    $dupe_of = trim($dupe_of);
+
+    # Store the bug ID/alias passed by the user for visibility checks.
+    my $orig_dupe_of = $dupe_of = trim($dupe_of);
     $dupe_of || ThrowCodeError('undefined_field', { field => 'dup_id' });
     # Validate the bug ID. The second argument will force check() to only
     # make sure that the bug exists, and convert the alias to the bug ID
@@ -1534,7 +1539,7 @@ sub _check_dup_id {
 
     # If we come here, then the duplicate is new. We have to make sure
     # that we can view/change it (issue A on bug 96085).
-    $dupe_of_bug->check_is_visible;
+    $dupe_of_bug->check_is_visible($orig_dupe_of);
 
     # Make sure a loop isn't created when marking this bug
     # as duplicate.

Bugzilla/Search/Quicksearch.pm

@@ -285,9 +285,10 @@ sub _handle_alias {
     if ($searchstring =~ /^([^,\s]+)$/) {
         my $alias = $1;
         # We use this direct SQL because we want quicksearch to be VERY fast.
-        my $is_alias = Bugzilla->dbh->selectrow_array(
-            q{SELECT 1 FROM bugs WHERE alias = ?}, undef, $alias);
-        if ($is_alias) {
+        my $bug_id = Bugzilla->dbh->selectrow_array(
+            q{SELECT bug_id FROM bugs WHERE alias = ?}, undef, $alias);
+        # If the user cannot see the bug, do not resolve its alias.
+        if ($bug_id && Bugzilla->user->can_see_bug($bug_id)) {
             $alias = url_quote($alias);
             print Bugzilla->cgi->redirect(
                 -uri => correct_urlbase() . "show_bug.cgi?id=$alias");

show_bug.cgi

@@ -13,8 +13,7 @@ use lib qw(. lib);
 use Bugzilla;
 use Bugzilla::Constants;
 use Bugzilla::Error;
-use Bugzilla::User;
-use Bugzilla::Keyword;
+use Bugzilla::Util;
 use Bugzilla::Bug;
 
 my $cgi = Bugzilla->cgi;
@@ -38,7 +37,7 @@ if (!$cgi->param('id') && $single) {
 my $format = $template->get_format("bug/show", scalar $cgi->param('format'), 
                                    scalar $cgi->param('ctype'));
 
-my @bugs;
+my (@bugs, @illegal_bugs);
 my %marks;
 
 # If the user isn't logged in, we use data from the shadow DB. If he plans
@@ -64,22 +63,23 @@ if ($single) {
     foreach my $id ($cgi->param('id')) {
         # Be kind enough and accept URLs of the form: id=1,2,3.
         my @ids = split(/,/, $id);
-        foreach (@ids) {
-            my $bug = new Bugzilla::Bug($_);
-            # This is basically a backwards-compatibility hack from when
-            # Bugzilla::Bug->new used to set 'NotPermitted' if you couldn't
-            # see the bug.
-            if (!$bug->{error} && !$user->can_see_bug($bug->bug_id)) {
-                $bug->{error} = 'NotPermitted';
+        foreach my $bug_id (@ids) {
+            next unless $bug_id;
+            my $bug = new Bugzilla::Bug($bug_id);
+            if (!$bug->{error} && $user->can_see_bug($bug->bug_id)) {
+                push(@bugs, $bug);
+            }
+            else {
+                push(@illegal_bugs, { bug_id => trim($bug_id),
+                                      error => $bug->{error} || 'NotPermitted' });
             }
-            push(@bugs, $bug);
         }
     }
 }
 
 Bugzilla::Bug->preload(\@bugs);
 
-$vars->{'bugs'} = \@bugs;
+$vars->{'bugs'} = [@bugs, @illegal_bugs];
 $vars->{'marks'} = \%marks;
 
 my @bugids = map {$_->bug_id} grep {!$_->error} @bugs;

template/en/default/bug/comments.html.tmpl

@@ -85,7 +85,8 @@
   [% count = count + increment %]
 [% END %]
 
-[% IF user.settings.comment_box_position.value == "before_comments" && user.id %]
+[% IF mode == "edit" && user.id
+      && user.settings.comment_box_position.value == "before_comments" %]
   <div class="bz_add_comment">
     <a href="#" 
        onclick="return goto_add_comments();">

template/en/default/global/user-error.html.tmpl

@@ -77,9 +77,13 @@
 
   [% ELSIF error == "alias_in_use" %]
     [% title = "Alias In Use" %]
-    [% terms.Bug %] [%+ bug_id FILTER bug_link(bug_id) FILTER none %]
+    [% IF user.can_see_bug(bug_id) %]
+      [% terms.Bug %] [%+ bug_id FILTER bug_link(bug_id) FILTER none %]
+    [% ELSE %]
+      Another [% terms.bug %]
+    [% END %]
     has already taken the alias <em>[% alias FILTER html %]</em>.
-    Please choose another one.
+    Please choose another alias.
 
   [% ELSIF error == "alias_is_numeric" %]
     [% title = "Alias Is Numeric" %]