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BackupPC verification helper
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BackupPC-Check/Lib.pm

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#============================================================= -*-perl-*-
#
# BackupPC::CGI::Lib package
#
# DESCRIPTION
#
# This library defines a BackupPC::Lib class and a variety of utility
# functions used by BackupPC.
#
# AUTHOR
# Craig Barratt <cbarratt@users.sourceforge.net>
#
# COPYRIGHT
# Copyright (C) 2003-2019 Craig Barratt
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
#
#========================================================================
#
# Version 4.3.1, released 14 Jul 2019.
#
# See http://backuppc.sourceforge.net.
#
#========================================================================
package BackupPC::CGI::Lib;
use strict;
use BackupPC::Lib;
require Exporter;
use vars qw( @ISA @EXPORT @EXPORT_OK %EXPORT_TAGS );
use vars qw($Cgi %In $MyURL $User %Conf $TopDir $LogDir $BinDir $bpc);
use vars qw(%Status %Info %Jobs @BgQueue @UserQueue @CmdQueue
%QueueLen %StatusHost);
use vars qw($Hosts $HostsMTime $ConfigMTime $PrivAdmin);
use vars qw(%UserEmailInfo $UserEmailInfoMTime %RestoreReq %ArchiveReq);
use vars qw($Lang);
@ISA = qw(Exporter);
@EXPORT = qw( );
@EXPORT_OK = qw(
timeStamp2
HostLink
UserLink
EscHTML
EscURI
ErrorExit
ServerConnect
GetStatusInfo
ReadUserEmailInfo
CheckPermission
GetUserHosts
ConfirmIPAddress
Header
Trailer
NavSectionTitle
NavSectionStart
NavSectionEnd
NavLink
h1
h2
$Cgi %In $MyURL $User %Conf $TopDir $LogDir $BinDir $bpc
%Status %Info %Jobs @BgQueue @UserQueue @CmdQueue
%QueueLen %StatusHost
$Hosts $HostsMTime $ConfigMTime $PrivAdmin
%UserEmailInfo $UserEmailInfoMTime %RestoreReq %ArchiveReq
$Lang
);
%EXPORT_TAGS = (
'all' => [ @EXPORT_OK ],
);
sub NewRequest
{
$Cgi = new CGI;
%In = $Cgi->Vars;
if ( !defined($bpc) ) {
ErrorExit($Lang->{BackupPC__Lib__new_failed__check_apache_error_log})
if ( !($bpc = BackupPC::Lib->new(undef, undef, undef, 1)) );
$TopDir = $bpc->TopDir();
$LogDir = $bpc->LogDir();
$BinDir = $bpc->BinDir();
%Conf = $bpc->Conf();
$Lang = $bpc->Lang();
$ConfigMTime = $bpc->ConfigMTime();
umask($Conf{UmaskMode});
} elsif ( $bpc->ConfigMTime() != $ConfigMTime ) {
$bpc->ConfigRead();
$TopDir = $bpc->TopDir();
$LogDir = $bpc->LogDir();
$BinDir = $bpc->BinDir();
%Conf = $bpc->Conf();
$Lang = $bpc->Lang();
$ConfigMTime = $bpc->ConfigMTime();
umask($Conf{UmaskMode});
}
#
# Default REMOTE_USER so in a miminal installation the user
# has a sensible default.
#
$ENV{REMOTE_USER} = $Conf{BackupPCUser} if ( $ENV{REMOTE_USER} eq "" );
#
# We require that Apache pass in $ENV{SCRIPT_NAME} and $ENV{REMOTE_USER}.
# The latter requires .ht_access style authentication. Replace this
# code if you are using some other type of authentication, and have
# a different way of getting the user name.
#
$MyURL = $ENV{SCRIPT_NAME};
$User = $ENV{REMOTE_USER};
#
# Handle LDAP uid=user when using mod_authz_ldap and otherwise untaint
#
$User = $1 if ( $User =~ /uid=([^,]+)/i || $User =~ /(.*)/ );
#
# Clean up %ENV for taint checking
#
delete @ENV{qw(IFS CDPATH ENV BASH_ENV)};
$ENV{PATH} = $Conf{MyPath};
#
# Verify we are running as the correct user
#
if ( $Conf{BackupPCUserVerify}
&& $> != (my $uid = getpwnam($Conf{BackupPCUser})) ) {
ErrorExit(eval("qq{$Lang->{Wrong_user__my_userid_is___}}"), <<EOF);
This script needs to run as the user specified in \$Conf{BackupPCUser},
which is set to $Conf{BackupPCUser}.
<p>
This is an installation problem. If you are using mod_perl then
it appears that Apache is not running as user $Conf{BackupPCUser}.
If you are not using mod_perl, then most like setuid is not working
properly on BackupPC_Admin. Check the permissions on
$Conf{CgiDir}/BackupPC_Admin and look at the documentation.
EOF
}
if ( !defined($Hosts) || $bpc->HostsMTime() != $HostsMTime ) {
$HostsMTime = $bpc->HostsMTime();
$Hosts = $bpc->HostInfoRead();
# turn moreUsers list into a hash for quick lookups
foreach my $host (keys %$Hosts) {
$Hosts->{$host}{moreUsers} =
{map {$_, 1} split(",", $Hosts->{$host}{moreUsers}) }
}
}
#
# Untaint the host name
#
if ( $In{host} =~ /^([\w.\s-]+)$/ ) {
$In{host} = $1;
} else {
delete($In{host});
}
}
sub timeStamp2
{
my $now = $_[0] == 0 ? time : $_[0];
my($sec,$min,$hour,$mday,$mon,$year,$wday,$yday,$isdst)
= localtime($now);
$mon++;
if ( $Conf{CgiDateFormatMMDD} == 2 ) {
$year += 1900;
return sprintf("%04d-%02d-%02d %02d:%02d", $year, $mon, $mday, $hour, $min);
} elsif ( $Conf{CgiDateFormatMMDD} ) {
#
# Add the year if the time is more than 330 days ago
#
if ( time - $now > 330 * 24 * 3600 ) {
$year -= 100;
return sprintf("$mon/$mday/%02d %02d:%02d", $year, $hour, $min);
} else {
return sprintf("$mon/$mday %02d:%02d", $hour, $min);
}
} else {
#
# Add the year if the time is more than 330 days ago
#
if ( time - $now > 330 * 24 * 3600 ) {
$year -= 100;
return sprintf("$mday/$mon/%02d %02d:%02d", $year, $hour, $min);
} else {
return sprintf("$mday/$mon %02d:%02d", $hour, $min);
}
}
}
sub HostLink
{
my($host) = @_;
my($s);
if ( defined($Hosts->{$host}) ) {
$s = "<a href=\"$MyURL?host=${EscURI($host)}\">$host</a>";
} else {
$s = $host;
}
return \$s;
}
sub UserLink
{
my($user) = @_;
my($s);
return \$user if ( $user eq ""
|| $Conf{CgiUserUrlCreate} eq "" );
if ( $Conf{CgiUserHomePageCheck} eq ""
|| -f sprintf($Conf{CgiUserHomePageCheck}, $user, $user, $user) ) {
$s = "<a href=\""
. sprintf($Conf{CgiUserUrlCreate}, $user, $user, $user)
. "\">$user</a>";
} else {
$s = $user;
}
return \$s;
}
sub EscHTML
{
my($s) = @_;
$s =~ s/&/&amp;/g;
$s =~ s/\"/&quot;/g;
$s =~ s/>/&gt;/g;
$s =~ s/</&lt;/g;
### $s =~ s{([^[:print:]])}{sprintf("&\#x%02X;", ord($1));}eg;
return \$s;
}
sub EscURI
{
my($s) = @_;
$s =~ s{([^\w.\/-])}{sprintf("%%%02X", ord($1));}eg;
return \$s;
}
sub ErrorExit
{
my(@mesg) = @_;
my($head) = shift(@mesg);
my($mesg) = join("</p>\n<p>", @mesg);
if ( !defined($ENV{REMOTE_USER}) ) {
$mesg .= <<EOF;
<p>
Note: \$ENV{REMOTE_USER} is not set, which could mean there is an
installation problem. BackupPC_Admin expects Apache to authenticate
the user and pass their user name into this script as the REMOTE_USER
environment variable. See the documentation.
EOF
}
$bpc->ServerMesg("log User $User (host=$In{host}) got CGI error: $head")
if ( defined($bpc) );
if ( !defined($Lang->{Error}) ) {
$mesg = <<EOF if ( !defined($mesg) );
There is some problem with the BackupPC installation.
Please check the permissions on BackupPC_Admin.
EOF
my $content = <<EOF;
${h1("Error: Unable to read config.pl or language strings!!")}
<p>$mesg</p>
EOF
Header("BackupPC: Error", $content);
Trailer();
} else {
my $content = eval("qq{$Lang->{Error____head}}");
Header(eval("qq{$Lang->{Error}}"), $content);
Trailer();
}
exit(1);
}
sub ServerConnect
{
#
# Verify that the server connection is ok
#
return if ( $bpc->ServerOK() );
$bpc->ServerDisconnect();
if ( my $err = $bpc->ServerConnect($Conf{ServerHost}, $Conf{ServerPort}) ) {
if ( CheckPermission()
&& -f $Conf{ServerInitdPath}
&& $Conf{ServerInitdStartCmd} ne "" ) {
my $content = eval("qq{$Lang->{Admin_Start_Server}}");
Header(eval("qq{$Lang->{Unable_to_connect_to_BackupPC_server}}"), $content);
Trailer();
exit(1);
} else {
ErrorExit(eval("qq{$Lang->{Unable_to_connect_to_BackupPC_server}}"),
eval("qq{$Lang->{Unable_to_connect_to_BackupPC_server_error_message}}"));
}
}
}
sub GetStatusInfo
{
my($status) = @_;
ServerConnect();
%Status = () if ( $status =~ /\bhosts\b/ );
%StatusHost = () if ( $status =~ /\bhost\(/ );
my $reply = $bpc->ServerMesg("status $status");
$reply = $1 if ( $reply =~ /(.*)/s );
eval($reply);
# ignore status related to admin jobs
if ( $status =~ /\bhosts\b/ ) {
foreach my $host ( grep(/admin/, keys(%Status)) ) {
delete($Status{$host}) if ( $bpc->isAdminJob($host) );
}
delete($Status{$bpc->scgiJob});
}
}
sub ReadUserEmailInfo
{
if ( (stat("$LogDir/UserEmailInfo.pl"))[9] != $UserEmailInfoMTime ) {
do "$LogDir/UserEmailInfo.pl";
$UserEmailInfoMTime = (stat("$LogDir/UserEmailInfo.pl"))[9];
}
}
#
# Check if the user is privileged. A privileged user can access
# any information (backup files, logs, status pages etc).
#
# A user is privileged if they belong to the group
# $Conf{CgiAdminUserGroup}, or they are in $Conf{CgiAdminUsers}
# or they are the user assigned to a host in the host file.
#
sub CheckPermission
{
my($host) = @_;
my $Privileged = 0;
return 0 if ( $User eq "" && $Conf{CgiAdminUsers} ne "*"
|| $host ne "" && !defined($Hosts->{$host}) );
if ( $Conf{CgiAdminUserGroup} ne "" ) {
for ( split(/\s+/, $Conf{CgiAdminUserGroup}) ) {
my ($n, $p, $gid, $mem) = getgrnam($_);
$Privileged ||= ( $mem =~ /\b\Q$User\E\b/ );
last if ( $Privileged );
}
}
if ( $Conf{CgiAdminUsers} ne "" ) {
$Privileged ||= ($Conf{CgiAdminUsers} =~ /\b\Q$User\E\b/);
$Privileged ||= $Conf{CgiAdminUsers} eq "*";
}
$PrivAdmin = $Privileged;
return $Privileged if ( !defined($host) );
$Privileged ||= $User eq $Hosts->{$host}{user};
$Privileged ||= defined($Hosts->{$host}{moreUsers}{$User});
return $Privileged;
}
#
# Returns the list of hosts that should appear in the navigation bar
# for this user. If $getAll is set, the admin gets all the hosts.
# Otherwise, regular users get hosts for which they are the user or
# are listed in the moreUsers column in the hosts file.
#
sub GetUserHosts
{
my($getAll) = @_;
my @hosts;
if ( $getAll && CheckPermission() ) {
@hosts = sort keys %$Hosts;
} else {
@hosts = sort grep { $Hosts->{$_}{user} eq $User ||
defined($Hosts->{$_}{moreUsers}{$User}) } keys(%$Hosts);
}
return @hosts;
}
#
# Given a host name tries to find the IP address. For non-dhcp hosts
# we just return the host name. For dhcp hosts we check the address
# the user is using ($ENV{REMOTE_ADDR}) and also the last-known IP
# address for $host. (Later we should replace this with a broadcast
# nmblookup.)
#
sub ConfirmIPAddress
{
my($host) = @_;
my $ipAddr = $host;
if ( defined($Hosts->{$host}) && $Hosts->{$host}{dhcp}
&& $ENV{REMOTE_ADDR} =~ /^(\d+[\.\d]*)$/ ) {
$ipAddr = $1;
my($netBiosHost, $netBiosUser) = $bpc->NetBiosInfoGet($ipAddr);
if ( $netBiosHost ne $host ) {
my($tryIP);
GetStatusInfo("host(${EscURI($host)})");
if ( defined($StatusHost{dhcpHostIP})
&& $StatusHost{dhcpHostIP} ne $ipAddr ) {
$tryIP = eval("qq{$Lang->{tryIP}}");
($netBiosHost, $netBiosUser)
= $bpc->NetBiosInfoGet($StatusHost{dhcpHostIP});
}
if ( $netBiosHost ne $host ) {
ErrorExit(eval("qq{$Lang->{Can_t_find_IP_address_for}}"),
eval("qq{$Lang->{host_is_a_DHCP_host}}"));
}
$ipAddr = $StatusHost{dhcpHostIP};
}
}
return $ipAddr;
}
###########################################################################
# HTML layout subroutines
###########################################################################
sub Header
{
my($title, $content, $noBrowse, $contentSub, $contentPost) = @_;
my @adminLinks = (
{ link => "?action=status", name => $Lang->{Status}},
{ link => "?action=summary", name => $Lang->{PC_Summary}},
{ link => "?action=editConfig", name => $Lang->{CfgEdit_Edit_Config},
priv => 1},
{ link => "?action=editConfig&newMenu=hosts",
name => $Lang->{CfgEdit_Edit_Hosts},
priv => 1},
{ link => "?action=adminOpts", name => $Lang->{Admin_Options},
priv => 1},
{ link => "?action=view&type=LOG", name => $Lang->{LOG_file},
priv => 1},
{ link => "?action=LOGlist", name => $Lang->{Old_LOGs},
priv => 1},
{ link => "?action=emailSummary", name => $Lang->{Email_summary},
priv => 1},
{ link => "?action=queue", name => $Lang->{Current_queues},
priv => 1},
{ link => "?action=check", name => 'Check',
priv => 1},
{ link => "?action=viewcheck", name => 'ViewCheck',
priv => 1},
@{$Conf{CgiNavBarLinks} || []},
);
my $host = $In{host};
binmode(select, ":utf8");
print $Cgi->header(-charset => "utf-8");
print <<EOF;
<!doctype html public "-//W3C//DTD HTML 4.01 Transitional//EN">
<html><head>
<title>$title</title>
<link rel=stylesheet type="text/css" href="$Conf{CgiImageDirURL}/$Conf{CgiCSSFile}" title="CSSFile">
<link rel=icon href="$Conf{CgiImageDirURL}/favicon.ico" type="image/x-icon">
$Conf{CgiHeaders}
<script src="$Conf{CgiImageDirURL}/sorttable.js"></script>
</head><body onLoad="document.getElementById('NavMenu').style.height=document.body.scrollHeight">
<div id="navigation-container">
<div id="logo-container">
<a href="https://backuppc.github.io/backuppc/"><img src="$Conf{CgiImageDirURL}/logo.gif"></a>
</div>
EOF
if ( defined($Hosts) && defined($host) && defined($Hosts->{$host}) ) {
print "<div class=\"NavMenu section-title\">";
NavSectionTitle("${EscHTML($host)}");
print <<EOF;
</div>
<div class="NavMenu host">
EOF
NavLink("?host=${EscURI($host)}",
"$host $Lang->{Home}", " class=\"navbar\"");
NavLink("?action=browse&host=${EscURI($host)}",
$Lang->{Browse}, " class=\"navbar\"") if ( !$noBrowse );
NavLink("?action=view&type=LOG&host=${EscURI($host)}",
$Lang->{LOG_file}, " class=\"navbar\"");
NavLink("?action=LOGlist&host=${EscURI($host)}",
$Lang->{LOG_files}, " class=\"navbar\"");
if ( -f "$TopDir/pc/$host/SmbLOG.bad"
|| -f "$TopDir/pc/$host/SmbLOG.bad.z"
|| -f "$TopDir/pc/$host/XferLOG.bad"
|| -f "$TopDir/pc/$host/XferLOG.bad.z" ) {
NavLink("?action=view&type=XferLOGbad&host=${EscURI($host)}",
$Lang->{Last_bad_XferLOG}, " class=\"navbar\"");
NavLink("?action=view&type=XferErrbad&host=${EscURI($host)}",
$Lang->{Last_bad_XferLOG_errors_only},
" class=\"navbar\"");
}
if ( $Conf{CgiUserConfigEditEnable} || $PrivAdmin ) {
NavLink("?action=editConfig&host=${EscURI($host)}",
$Lang->{CfgEdit_Edit_Config}, " class=\"navbar\"");
} elsif ( -f "$TopDir/pc/$host/config.pl"
|| ($host ne "config" && -f "$TopDir/conf/$host.pl") ) {
NavLink("?action=view&type=config&host=${EscURI($host)}",
$Lang->{Config_file}, " class=\"navbar\"");
}
print "</div>\n";
}
print <<EOF;
<div class="NavMenu" id="NavMenu">
EOF
my $hostSelectbox = "<option value=\"#\">$Lang->{Select_a_host}</option>";
my @hosts = GetUserHosts($Conf{CgiNavBarAdminAllHosts});
NavSectionTitle($Lang->{Hosts});
if ( defined($Hosts) && %$Hosts > 0 && @hosts ) {
foreach my $host ( @hosts ) {
NavLink("?host=${EscURI($host)}", $host)
if ( @hosts < $Conf{CgiNavBarAdminAllHosts} );
my $sel = " selected" if ( $host eq $In{host} );
$hostSelectbox .= "<option value=\"?host=${EscURI($host)}\"$sel>"
. "$host</option>";
}
}
if ( @hosts >= $Conf{CgiNavBarAdminAllHosts} ) {
print <<EOF;
<select onChange="document.location=this.value">
$hostSelectbox
</select>
EOF
}
if ( $Conf{CgiSearchBoxEnable} ) {
print <<EOF;
<form action="$MyURL" method="get">
<input type="text" name="host" size="14" maxlength="64">
<input type="hidden" name="action" value="hostInfo"><input type="submit" value="$Lang->{Go}" name="ignore">
</form>
EOF
}
NavSectionTitle($Lang->{NavSectionTitle_});
foreach my $l ( @adminLinks ) {
if ( $PrivAdmin || !$l->{priv} ) {
my $txt = $l->{lname} ne "" ? $Lang->{$l->{lname}} : $l->{name};
NavLink($l->{link}, $txt);
}
}
print <<EOF;
</div>
</div> <!-- end #navigation-container -->
EOF
print("<div id=\"Content\">\n$content\n");
if ( defined($contentSub) && ref($contentSub) eq "CODE" ) {
while ( (my $s = &$contentSub()) ne "" ) {
print($s);
}
}
print($contentPost) if ( defined($contentPost) );
}
sub Trailer
{
print <<EOF;
</body></html>
EOF
}
sub NavSectionTitle
{
my($head) = @_;
print <<EOF;
<h2 class="NavTitle">$head</h2>
EOF
}
sub NavSectionStart
{
}
sub NavSectionEnd
{
}
sub NavLink
{
my($link, $text) = @_;
if ( defined($link) ) {
my($class);
$class = " class=\"NavCurrent\""
if ( length($link) && $ENV{REQUEST_URI} =~ /\Q$link\E$/
|| length($link) && $link =~ /\&host=/ && $ENV{REQUEST_URI} =~ /\Q$link\E/
|| $link eq "" && $ENV{REQUEST_URI} !~ /\?/ );
$link = "$MyURL$link" if ( $link eq "" || $link =~ /^\?/ );
print <<EOF;
<a href="$link"$class>$text</a>
EOF
} else {
print <<EOF;
$text<br>
EOF
}
}
sub h1
{
my($str) = @_;
return \<<EOF;
<h1>$str</h1>
EOF
}
sub h2
{
my($str) = @_;
return \<<EOF;
<h2>$str</h2>
EOF
}