Bug 1261538 - Bugzilla is unable to access attachment.cgi when ssl_redirect = true and using Plack

Bugzilla.pm

@@ -131,11 +131,6 @@ sub init_page {
 
     my $script = basename($0);
 
-    # Because of attachment_base, attachment.cgi handles this itself.
-    if ($script ne 'attachment.cgi') {
-        do_ssl_redirect_if_required();
-    }
-
     # If Bugzilla is shut down, do not allow anything to run, just display a
     # message to the user about the downtime and log out.  Scripts listed in 
     # SHUTDOWNHTML_EXEMPT are exempt from this message.

Bugzilla/CGI.pm

@@ -53,10 +53,18 @@ sub new {
     # Make sure our outgoing cookie list is empty on each invocation
     $self->{Bugzilla_cookie_list} = [];
 
+    my $script = basename($0);
+
+    # attachment.cgi handles this itself.
+    if ($script ne 'attachment.cgi') {
+        $self->do_ssl_redirect_if_required();
+        $self->redirect_to_urlbase if $self->url_is_attachment_base;
+    }
+
+
     # Path-Info is of no use for Bugzilla and interacts badly with IIS.
     # Moreover, it causes unexpected behaviors, such as totally breaking
     # the rendering of pages.
-    my $script = basename($0);
     if (my $path_info = $self->path_info) {
         my @whitelist = ("rest.cgi");
         Bugzilla::Hook::process('path_info_whitelist', { whitelist => \@whitelist });
@@ -75,11 +83,6 @@ sub new {
     # Send appropriate charset
     $self->charset('UTF-8');
 
-    # Redirect to urlbase/sslbase if we are not viewing an attachment.
-    if ($self->url_is_attachment_base and $script ne 'attachment.cgi') {
-        $self->redirect_to_urlbase();
-    }
-
     # Check for errors
     # All of the Bugzilla code wants to do this, so do it here instead of
     # in each script
@@ -539,7 +542,7 @@ sub redirect_to_urlbase {
 
 sub url_is_attachment_base {
     my ($self, $id) = @_;
-    return 0 if !use_attachbase() or !i_am_cgi();
+    return 0 unless use_attachbase() && i_am_cgi();
     my $attach_base = Bugzilla->params->{'attachment_base'};
     # If we're passed an id, we only want one specific attachment base
     # for a particular bug. If we're not passed an ID, we just want to
@@ -556,7 +559,20 @@ sub url_is_attachment_base {
         $regex =~ s/\\\%bugid\\\%/\\d+/;
     }
     $regex = "^$regex";
-    return ($self->url =~ $regex) ? 1 : 0;
+
+    my $url = $self->url;
+
+    # If we are behind a reverse proxy, we need to determine the original
+    # URL, else the comparison with the attachment_base URL will fail.
+    if (Bugzilla->params->{'inbound_proxies'}) {
+        # X-Forwarded-Proto is defined in RFC 7239.
+        my $protocol = $ENV{HTTP_X_FORWARDED_PROTO} || $self->protocol;
+        my $host = $self->virtual_host;
+        # X-Forwarded-URI is not standard.
+        my $uri = $ENV{HTTP_X_FORWARDED_URI} || $self->request_uri || '';
+        $url = "$protocol://$host$uri";
+    }
+    return ($url =~ $regex) ? 1 : 0;
 }
 
 sub set_dated_content_disp {

Bugzilla/Util.pm

@@ -250,29 +250,36 @@ sub i_am_webservice {
 sub do_ssl_redirect_if_required {
     return if !i_am_cgi();
     return if !Bugzilla->params->{'ssl_redirect'};
+    return if !Bugzilla->params->{'sslbase'};
 
-    my $sslbase = Bugzilla->params->{'sslbase'};
-    
     # If we're already running under SSL, never redirect.
+    if (Bugzilla->params->{'inbound_proxies'}
+        && uc($ENV{HTTP_X_FORWARDED_PROTO} || '') eq 'HTTPS') {
+        return;
+    }
     return if uc($ENV{HTTPS} || '') eq 'ON';
-    # Never redirect if there isn't an sslbase.
-    return if !$sslbase;
-    Bugzilla->cgi->redirect_to_https();
+
+    # If called from Bugzilla::CGI->new itself, use the newly created
+    # CGI object, to avoid deep recursions.
+    my $cgi = shift || Bugzilla->cgi;
+    $cgi->redirect_to_https();
 }
 
 sub correct_urlbase {
-    my $ssl = Bugzilla->params->{'ssl_redirect'};
     my $urlbase = Bugzilla->params->{'urlbase'};
     my $sslbase = Bugzilla->params->{'sslbase'};
 
     if (!$sslbase) {
         return $urlbase;
     }
-    elsif ($ssl) {
+    elsif (Bugzilla->params->{'ssl_redirect'}) {
         return $sslbase;
     }
+    # Return what the user currently uses.
+    elsif (Bugzilla->params->{'inbound_proxies'}) {
+        return (uc($ENV{HTTP_X_FORWARDED_PROTO} || '') eq 'HTTPS') ? $sslbase : $urlbase;
+    }
     else {
-        # Return what the user currently uses.
         return (uc($ENV{HTTPS} || '') eq 'ON') ? $sslbase : $urlbase;
     }
 }