1 files changed, 45 insertions, 1 deletions

diff --git a/Bugzilla/Bug.pm b/Bugzilla/Bug.pm
index 32030a7c2..a82df3b69 100755
--- a/Bugzilla/Bug.pm
+++ b/Bugzilla/Bug.pm
@@ -50,7 +50,7 @@ use Bugzilla::Error;
 use base qw(Exporter);
 @Bugzilla::Bug::EXPORT = qw(
     AppendComment ValidateComment
-    bug_alias_to_id ValidateBugAlias
+    bug_alias_to_id ValidateBugAlias ValidateBugID
     RemoveVotes CheckIfVotedConfirmed
 );
 
@@ -1102,6 +1102,50 @@ sub CheckIfVotedConfirmed {
 # Field Validation
 #
 
+# Validates and verifies a bug ID, making sure the number is a 
+# positive integer, that it represents an existing bug in the
+# database, and that the user is authorized to access that bug.
+# We detaint the number here, too.
+sub ValidateBugID {
+    my ($id, $field) = @_;
+    my $dbh = Bugzilla->dbh;
+    my $user = Bugzilla->user;
+
+    # Get rid of white-space around the ID.
+    $id = trim($id);
+    
+    # If the ID isn't a number, it might be an alias, so try to convert it.
+    my $alias = $id;
+    if (!detaint_natural($id)) {
+        $id = bug_alias_to_id($alias);
+        $id || ThrowUserError("invalid_bug_id_or_alias",
+                              {'bug_id' => $alias,
+                               'field'  => $field });
+    }
+    
+    # Modify the calling code's original variable to contain the trimmed,
+    # converted-from-alias ID.
+    $_[0] = $id;
+    
+    # First check that the bug exists
+    $dbh->selectrow_array("SELECT bug_id FROM bugs WHERE bug_id = ?", undef, $id)
+      || ThrowUserError("invalid_bug_id_non_existent", {'bug_id' => $id});
+
+    return if (defined $field && ($field eq "dependson" || $field eq "blocked"));
+    
+    return if $user->can_see_bug($id);
+
+    # The user did not pass any of the authorization tests, which means they
+    # are not authorized to see the bug.  Display an error and stop execution.
+    # The error the user sees depends on whether or not they are logged in
+    # (i.e. $user->id contains the user's positive integer ID).
+    if ($user->id) {
+        ThrowUserError("bug_access_denied", {'bug_id' => $id});
+    } else {
+        ThrowUserError("bug_access_query", {'bug_id' => $id});
+    }
+}
+
 # ValidateBugAlias:
 #   Check that the bug alias is valid and not used by another bug.  If 
 #   curr_id is specified, verify the alias is not used for any other