setup - System Configuration and Setup Files

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#!/usr/bin/perl -T
# This Source Code Form is subject to the terms of the Mozilla Public
# License, v. 2.0. If a copy of the MPL was not distributed with this
# file, You can obtain one at http://mozilla.org/MPL/2.0/.
#
# This Source Code Form is "Incompatible With Secondary Licenses", as
# defined by the Mozilla Public License, v. 2.0.

use 5.10.1;
use strict;
use warnings;

use lib qw(. lib);

use Bugzilla;
use Bugzilla::BugMail;
use Bugzilla::Constants;
use Bugzilla::Error;
use Bugzilla::Flag; 
use Bugzilla::FlagType; 
use Bugzilla::User;
use Bugzilla::Util;
use Bugzilla::Bug;
use Bugzilla::Attachment;
use Bugzilla::Attachment::PatchReader;
use Bugzilla::Token;

use Encode qw(encode find_encoding);
use Encode::MIME::Header; # Required to alter Encode::Encoding{'MIME-Q'}.

# For most scripts we don't make $cgi and $template global variables. But
# when preparing Bugzilla for mod_perl, this script used these
# variables in so many subroutines that it was easier to just
# make them globals.
local our $cgi = Bugzilla->cgi;
local our $template = Bugzilla->template;
local our $vars = {};
local $Bugzilla::CGI::ALLOW_UNSAFE_RESPONSE = 1;

# All calls to this script should contain an "action" variable whose
# value determines what the user wants to do.  The code below checks
# the value of that variable and runs the appropriate code. If none is
# supplied, we default to 'view'.

# Determine whether to use the action specified by the user or the default.
my $action = $cgi->param('action') || 'view';
my $format = $cgi->param('format') || '';

# You must use the appropriate urlbase/sslbase param when doing anything
# but viewing an attachment, or a raw diff.
if ($action ne 'view'
    && (($action !~ /^(?:interdiff|diff)$/) || $format ne 'raw'))
{
    do_ssl_redirect_if_required();
    if ($cgi->url_is_attachment_base) {
        $cgi->redirect_to_urlbase;
    }
    Bugzilla->login();
}

# When viewing an attachment, do not request credentials if we are on
# the alternate host. Let view() decide when to call Bugzilla->login.
if ($action eq "view")
{
    view();
}
elsif ($action eq "interdiff")
{
    interdiff();
}
elsif ($action eq "diff")
{
    diff();
}
elsif ($action eq "viewall") 
{ 
    viewall(); 
}
elsif ($action eq "enter") 
{ 
    Bugzilla->login(LOGIN_REQUIRED);
    enter(); 
}
elsif ($action eq "insert")
{
    Bugzilla->login(LOGIN_REQUIRED);
    insert();
}
elsif ($action eq "edit") 
{ 
    edit(); 
}
elsif ($action eq "update") 
{ 
    Bugzilla->login(LOGIN_REQUIRED);
    update();
}
elsif ($action eq "delete") {
    delete_attachment();
}
else 
{ 
  ThrowUserError('unknown_action', {action => $action});
}

exit;

################################################################################
# Data Validation / Security Authorization
################################################################################

# Validates an attachment ID. Optionally takes a parameter of a form
# variable name that contains the ID to be validated. If not specified,
# uses 'id'.
# If the second parameter is true, the attachment ID will be validated,
# however the current user's access to the attachment will not be checked.
# Will throw an error if 1) attachment ID is not a valid number,
# 2) attachment does not exist, or 3) user isn't allowed to access the
# attachment.
#
# Returns an attachment object.

sub validateID {
    my($param, $dont_validate_access) = @_;
    $param ||= 'id';

    # If we're not doing interdiffs, check if id wasn't specified and
    # prompt them with a page that allows them to choose an attachment.
    # Happens when calling plain attachment.cgi from the urlbar directly
    if ($param eq 'id' && !$cgi->param('id')) {
        print $cgi->header();
        $template->process("attachment/choose.html.tmpl", $vars) ||
            ThrowTemplateError($template->error());
        exit;
    }
    
    my $attach_id = $cgi->param($param);

    # Validate the specified attachment id. detaint kills $attach_id if
    # non-natural, so use the original value from $cgi in our exception
    # message here.
    detaint_natural($attach_id)
        || ThrowUserError("invalid_attach_id",
                          { attach_id => scalar $cgi->param($param) });
  
    # Make sure the attachment exists in the database.
    my $attachment = new Bugzilla::Attachment({ id => $attach_id, cache => 1 })
        || ThrowUserError("invalid_attach_id", { attach_id => $attach_id });

    return $attachment if ($dont_validate_access || check_can_access($attachment));
}

# Make sure the current user has access to the specified attachment.
sub check_can_access {
    my $attachment = shift;
    my $user = Bugzilla->user;

    # Make sure the user is authorized to access this attachment's bug.
    Bugzilla::Bug->check({ id => $attachment->bug_id, cache => 1 });
    if ($attachment->isprivate && $user->id != $attachment->attacher->id 
        && !$user->is_insider) 
    {
        ThrowUserError('auth_failure', {action => 'access',
                                        object => 'attachment',
                                        attach_id => $attachment->id});
    }
    return 1;
}

# Determines if the attachment is public -- that is, if users who are
# not logged in have access to the attachment
sub attachmentIsPublic {
    my $attachment = shift;

    return 0 if Bugzilla->params->{'requirelogin'};
    return 0 if $attachment->isprivate;

    my $anon_user = new Bugzilla::User;
    return $anon_user->can_see_bug($attachment->bug_id);
}

# Validates format of a diff/interdiff. Takes a list as an parameter, which
# defines the valid format values. Will throw an error if the format is not
# in the list. Returns either the user selected or default format.
sub validateFormat {
  # receives a list of legal formats; first item is a default
  my $format = $cgi->param('format') || $_[0];
  if (not grep($_ eq $format, @_)) {
     ThrowUserError("invalid_format", { format  => $format, formats => \@_ });
  }

  return $format;
}

# Gets the attachment object(s) generated by validateID, while ensuring
# attachbase and token authentication is used when required.
sub get_attachment {
    my @field_names = @_ ? @_ : qw(id);

    my %attachments;

    if (use_attachbase()) {
        # Load each attachment, and ensure they are all from the same bug
        my $bug_id = 0;
        foreach my $field_name (@field_names) {
            my $attachment = validateID($field_name, 1);
            if (!$bug_id) {
                $bug_id = $attachment->bug_id;
            } elsif ($attachment->bug_id != $bug_id) {
                ThrowUserError('attachment_bug_id_mismatch');
            }
            $attachments{$field_name} = $attachment;
        }
        my @args = map { $_ . '=' . $attachments{$_}->id } @field_names;
        my $cgi_params = $cgi->canonicalise_query(@field_names, 't',
            'Bugzilla_login', 'Bugzilla_password');
        push(@args, $cgi_params) if $cgi_params;
        my $path = 'attachment.cgi?' . join('&', @args);

        # Make sure the attachment is served from the correct server.
        if ($cgi->url_is_attachment_base($bug_id)) {
            # No need to validate the token for public attachments. We cannot request
            # credentials as we are on the alternate host.
            if (!all_attachments_are_public(\%attachments)) {
                my $token = $cgi->param('t');
                my ($userid, undef, $token_data) = Bugzilla::Token::GetTokenData($token);
                my %token_data = unpack_token_data($token_data);
                my $valid_token = 1;
                foreach my $field_name (@field_names) {
                    my $token_id = $token_data{$field_name};
                    if (!$token_id
                        || !detaint_natural($token_id)
                        || $attachments{$field_name}->id != $token_id)
                    {
                        $valid_token = 0;
                        last;
                    }
                }
                unless ($userid && $valid_token) {
                    # Not a valid token.
                    print $cgi->redirect('-location' => correct_urlbase() . $path);
                    exit;
                }
                # Change current user without creating cookies.
                Bugzilla->set_user(new Bugzilla::User($userid));
                # Tokens are single use only, delete it.
                delete_token($token);
            }
        }
        elsif ($cgi->url_is_attachment_base) {
            # If we come here, this means that each bug has its own host
            # for attachments, and that we are trying to view one attachment
            # using another bug's host. That's not desired.
            $cgi->redirect_to_urlbase;
        }
        else {
            # We couldn't call Bugzilla->login earlier as we first had to
            # make sure we were not going to request credentials on the
            # alternate host.
            Bugzilla->login();
            my $attachbase = Bugzilla->params->{'attachment_base'};
            # Replace %bugid% by the ID of the bug the attachment 
            # belongs to, if present.
            $attachbase =~ s/\%bugid\%/$bug_id/;
            if (all_attachments_are_public(\%attachments)) {
                # No need for a token; redirect to attachment base.
                print $cgi->redirect(-location => $attachbase . $path);
                exit;
            } else {
                # Make sure the user can view the attachment.
                foreach my $field_name (@field_names) {
                    check_can_access($attachments{$field_name});
                }
                # Create a token and redirect.
                my $token = url_quote(issue_session_token(pack_token_data(\%attachments)));
                print $cgi->redirect(-location => $attachbase . "$path&t=$token");
                exit;
            }
        }
    } else {
        do_ssl_redirect_if_required();
        # No alternate host is used. Request credentials if required.
        Bugzilla->login();
        foreach my $field_name (@field_names) {
            $attachments{$field_name} = validateID($field_name);
        }
    }

    return wantarray
        ? map { $attachments{$_} } @field_names
        : $attachments{$field_names[0]};
}

sub all_attachments_are_public {
    my $attachments = shift;
    foreach my $field_name (keys %$attachments) {
        if (!attachmentIsPublic($attachments->{$field_name})) {
            return 0;
        }
    }
    return 1;
}

sub pack_token_data {
    my $attachments = shift;
    return join(' ', map { $_ . '=' . $attachments->{$_}->id } keys %$attachments);
}

sub unpack_token_data {
    my @token_data = split(/ /, shift || '');
    my %data;
    foreach my $token (@token_data) {
        my ($field_name, $attach_id) = split('=', $token);
        $data{$field_name} = $attach_id;
    }
    return %data;
}

################################################################################
# Functions
################################################################################

# Display an attachment.
sub view {
    my $attachment = get_attachment();

    # At this point, Bugzilla->login has been called if it had to.
    my $contenttype = $attachment->contenttype;
    my $filename = $attachment->filename;

    # Bug 111522: allow overriding content-type manually in the posted form
    # params.
    if (defined $cgi->param('content_type')) {
        $contenttype = $attachment->_check_content_type($cgi->param('content_type'));
    }

    # Return the appropriate HTTP response headers.
    $attachment->datasize || ThrowUserError("attachment_removed");

    $filename =~ s/^.*[\/\\]//;
    # escape quotes and backslashes in the filename, per RFCs 2045/822
    $filename =~ s/\\/\\\\/g; # escape backslashes
    $filename =~ s/"/\\"/g; # escape quotes

    # Avoid line wrapping done by Encode, which we don't need for HTTP
    # headers. See discussion in bug 328628 for details.
    local $Encode::Encoding{'MIME-Q'}->{'bpl'} = 10000;
    $filename = encode('MIME-Q', $filename);

    my $disposition = Bugzilla->params->{'allow_attachment_display'} ? 'inline' : 'attachment';

    # Don't send a charset header with attachments--they might not be UTF-8.
    # However, we do allow people to explicitly specify a charset if they
    # want.
    if ($contenttype !~ /\bcharset=/i) {
        # In order to prevent Apache from adding a charset, we have to send a
        # charset that's a single space.
        $cgi->charset(' ');
        if (Bugzilla->feature('detect_charset') && $contenttype =~ /^text\//) {
            my $encoding = detect_encoding($attachment->data);
            if ($encoding) {
                $cgi->charset(find_encoding($encoding)->mime_name);
            }
        }
    }
    print $cgi->header(-type=>"$contenttype; name=\"$filename\"",
                       -content_disposition=> "$disposition; filename=\"$filename\"",
                       -content_length => $attachment->datasize);
    disable_utf8();
    print $attachment->data;
}

sub interdiff {
    # Retrieve and validate parameters
    my $format = validateFormat('html', 'raw');


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