/usr/share/popfile/Proxy/POP3.pm is in popfile 1.1.3+dfsg-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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package Proxy::POP3;
use Proxy::Proxy;
use Digest::MD5;
@ISA = ("Proxy::Proxy");
# ----------------------------------------------------------------------------
#
# This module handles proxying the POP3 protocol for POPFile.
#
# Copyright (c) 2001-2011 John Graham-Cumming
#
# This file is part of POPFile
#
# POPFile is free software; you can redistribute it and/or modify it
# under the terms of version 2 of the GNU General Public License as
# published by the Free Software Foundation.
#
# POPFile 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 POPFile; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
#
# Modified by Sam Schinke (sschinke@users.sourceforge.net)
#
# ----------------------------------------------------------------------------
use strict;
use warnings;
use locale;
# A handy variable containing the value of an EOL for networks
my $eol = "\015\012";
#----------------------------------------------------------------------------
# new
#
# Class new() function
#----------------------------------------------------------------------------
sub new
{
my $type = shift;
my $self = Proxy::Proxy->new();
# Must call bless before attempting to call any methods
bless $self, $type;
$self->name( 'pop3' );
$self->{child_} = \&child__;
$self->{connection_timeout_error_} = '-ERR no response from mail server';
$self->{connection_failed_error_} = '-ERR can\'t connect to';
$self->{good_response_} = '^\+OK';
# Client requested APOP
$self->{use_apop__} = 0;
# APOP username
$self->{apop_user__} = '';
# The APOP portion of the banner sent by the POP3 server
$self->{apop_banner__} = undef;
return $self;
}
# ----------------------------------------------------------------------------
#
# initialize
#
# Called to initialize the POP3 proxy module
#
# ----------------------------------------------------------------------------
sub initialize
{
my ( $self ) = @_;
# Enabled by default
$self->config_( 'enabled', 1 );
# By default we don't fork on Windows
$self->config_( 'force_fork', ($^O eq 'MSWin32')?0:1 );
# Default ports for POP3 service and the user interface
$self->config_( 'port', 110 );
# There is no default setting for the secure server
$self->config_( 'secure_server', '' );
$self->config_( 'secure_port', 110 );
# Only accept connections from the local machine for POP3
$self->config_( 'local', 1 );
# Whether to do classification on TOP as well
$self->config_( 'toptoo', 0 );
# The separator within the POP3 username is :
$self->config_( 'separator', ':' );
# The welcome string from the proxy is configurable
$self->config_( 'welcome_string', # PROFILE BLOCK START
"POP3 POPFile ($self->{version_}) server ready" ); # PROFILE BLOCK STOP
return $self->SUPER::initialize();
}
# ----------------------------------------------------------------------------
#
# start
#
# ----------------------------------------------------------------------------
sub start
{
my ( $self ) = @_;
# If we are not enabled then no further work happens in this module
if ( $self->config_( 'enabled' ) == 0 ) {
return 2;
}
# Tell the user interface module that we having a configuration
# item that needs a UI component
$self->register_configuration_item_( 'configuration', # PROFILE BLOCK START
'pop3_configuration',
'pop3-configuration-panel.thtml',
$self ); # PROFILE BLOCK STOP
$self->register_configuration_item_( 'security', # PROFILE BLOCK START
'pop3_security',
'pop3-security-panel.thtml',
$self ); # PROFILE BLOCK STOP
$self->register_configuration_item_( 'chain', # PROFILE BLOCK START
'pop3_chain',
'pop3-chain-panel.thtml',
$self ); # PROFILE BLOCK STOP
if ( $self->config_( 'welcome_string' ) =~ # PROFILE BLOCK START
/^POP3 POPFile \(v\d+\.\d+\.\d+\) server ready$/ ) { # PROFILE BLOCK STOP
$self->config_( 'welcome_string', # PROFILE BLOCK START
"POP3 POPFile ($self->{version_}) server ready" ); # PROFILE BLOCK STOP
}
return $self->SUPER::start();
}
# ----------------------------------------------------------------------------
#
# child__
#
# The worker method that is called when we get a good connection from
# a client
#
# $client - an open stream to a POP3 client
# $session - API session key
#
# ----------------------------------------------------------------------------
sub child__
{
my ( $self, $client, $session ) = @_;
# Hash of indexes of downloaded messages mapped to their
# slot IDs
my %downloaded;
# The handle to the real mail server gets stored here
my $mail;
$self->{apop_banner__} = undef;
$self->{use_apop__} = 0;
$self->{apop_user__} = '';
# Tell the client that we are ready for commands and identify our
# version number
$self->tee_( $client, "+OK " . $self->config_( 'welcome_string' ) . # PROFILE BLOCK START
"$eol" ); # PROFILE BLOCK STOP
# Compile some configurable regexp's once
my $s = $self->config_( 'separator' );
$s =~ s/(\$|\@|\[|\]|\(|\)|\||\?|\*|\.|\^|\+)/\\$1/;
my $transparent = "^USER ([^$s]+)\$";
my $user_command = "USER ([^$s]+)($s(\\d{1,5}))?$s([^$s]+)($s([^$s]+))?";
my $apop_command = "APOP ([^$s]+)($s(\\d{1,5}))?$s([^$s]+) (.*?)";
$self->log_( 2, "Regexps: $transparent, $user_command, $apop_command" );
# Retrieve commands from the client and process them until the
# client disconnects or we get a specific QUIT command
while ( <$client> ) {
my $command;
$command = $_;
# Clean up the command so that it has a nice clean $eol at the
# end
$command =~ s/(\015|\012)//g;
$self->log_( 2, "Command: --$command--" );
# The USER command is a special case because we modify the
# syntax of POP3 a little to expect that the username being
# passed is actually of the form host:username where host is
# the actual remote mail server to contact and username is the
# username to pass through to that server and represents the
# account on the remote machine that we will pull email from.
# Doing this means we can act as a proxy for multiple mail
# clients and mail accounts
#
# When the client issues the command "USER host:username:apop"
# POPFile must acknowledge the command and be prepared to
# compute the md5 digest of the user's password and the real
# pop server's banner upon receipt of a PASS command.
#
# When the client issues the command "USER host:username:ssl"
# POPFile will use SSL for the connection to the remote, note
# that the user can say host:username:ssl,apop if both are
# needed
if ( $command =~ /$transparent/i ) {
if ( $self->config_( 'secure_server' ) ne '' ) {
if ( $mail = $self->verify_connected_( $mail, $client, # PROFILE BLOCK START
$self->config_( 'secure_server' ),
$self->config_( 'secure_port' ) ) ) { # PROFILE BLOCK STOP
last if ($self->echo_response_($mail, $client, $command) == 2 );
} else {
next;
}
} else {
$self->tee_( $client, "-ERR Transparent proxying not configured: set secure server/port ( command you sent: '$command' )$eol" );
}
next;
}
if ( $command =~ /$user_command/i ) {
if ( $1 ne '' ) {
my ( $host, $port, $user, $options ) = ($1, $3, $4, $6);
$self->mq_post_( 'LOGIN', $user );
my $ssl = defined( $options ) && ( $options =~ /ssl/i );
# We cannot use the concurrent POP3 connections with SSL on
# Windows because one of SSL support modules (Net::SSLeay) is
# not thread-safe. ActivePerl for Windows emulates fork() by
# multiple threads.
if ( $ssl && ( $^O eq 'MSWin32' ) && $self->config_( 'force_fork' ) ) {
$self->tee_( $client, "-ERR On Windows, SSL support cannot be used with concurrent POP3 connections$eol" );
next;
}
$port = $ssl?995:110 if ( !defined( $port ) );
if ( $mail = $self->verify_connected_( $mail, $client, # PROFILE BLOCK START
$host, $port, $ssl ) ) { # PROFILE BLOCK STOP
if ( defined( $options ) && ( $options =~ /apop/i ) ) {
# We want to make sure the server sent a real
# APOP banner, containing <>'s
$self->{apop_banner__} = $1 if $self->{connect_banner__} =~ /(<[^>]+>)/;
$self->log_( 2, "banner=" . $self->{apop_banner__} ) if defined( $self->{apop_banner__} );
# any apop banner is ok
if ( defined($self->{apop_banner__})) {
$self->{use_apop__} = 1; #
$self->log_( 2, "auth APOP" );
$self->{apop_user__} = $user;
# tell the client that username was
# accepted don't flush_extra, we didn't
# send anything to the real server
$self->tee_( $client, "+OK hello $user$eol" );
next;
} else {
# If the client asked for APOP, and the
# server doesn't have the correct banner,
# give a meaningful error instead of
# whatever error the server might have if
# we try to make up a hash
$self->{use_apop__} = 0;
$self->tee_( $client, "-ERR $host doesn't support APOP, aborting authentication$eol" );
next;
}
} else {
# Pass through the USER command with the
# actual user name for this server, and send
# the reply straight to the client
$self->log_( 2, "auth plaintext" );
$self->{use_apop__} = 0; # signifies a non-apop connection
last if ($self->echo_response_( $mail, $client, 'USER ' . $user ) == 2 );
}
} else {
# If the login fails then we want to continue in
# the unlogged in state so that clients can send
# us the QUIT command
next;
}
}
next;
}
# User is issuing the APOP command to start a session with the
# remote server
if ( ( $command =~ /PASS (.*)/i ) ) {
if ( $self->{use_apop__} ) {
# Authenticate with APOP
my $md5 = Digest::MD5->new;
$md5->add( $self->{apop_banner__}, $1 );
my $md5hex = $md5->hexdigest;
$self->log_( 2, "digest='$md5hex'" );
my ( $response, $ok ) = # PROFILE BLOCK START
$self->get_response_( $mail, $client,
"APOP $self->{apop_user__} $md5hex", 0, 1 ); # PROFILE BLOCK STOP
if ( ( $ok == 1 ) && # PROFILE BLOCK START
( $response =~ /$self->{good_response_}/ ) ) { # PROFILE BLOCK STOP
# authentication OK, toss the hello response and
# return password ok
$self->tee_( $client, "+OK password ok$eol" );
} else {
$self->tee_( $client, $response );
}
} else {
last if ($self->echo_response_($mail, $client, $command) == 2 );
}
next;
}
# User is issuing the APOP command to start a session with the
# remote server. We'd need a copy of the plaintext password to
# support this.
if ( $command =~ /$apop_command/io ) {
$self->tee_( $client, # PROFILE BLOCK START
"-ERR APOP not supported between mail client and POPFile.$eol" ); # PROFILE BLOCK STOP
# TODO: Consider implementing a host:port:username:secret
# hash syntax for proxying the APOP command
next;
}
# Secure authentication
if ( $command =~ /AUTH ([^ ]+)/i ) {
if ( $self->config_( 'secure_server' ) ne '' ) {
if ( $mail = $self->verify_connected_( $mail, $client, # PROFILE BLOCK START
$self->config_( 'secure_server' ),
$self->config_( 'secure_port' ) ) ) { # PROFILE BLOCK STOP
# Loop until we get -ERR or +OK
my ( $response, $ok ) = $self->get_response_( $mail, $client, $command );
while ( ( ! ( $response =~ /\+OK/ ) ) && ( ! ( $response =~ /-ERR/ ) ) ) {
my $auth;
$auth = <$client>;
$auth =~ s/(\015|\012)$//g;
( $response, $ok ) = $self->get_response_( $mail, $client, $auth );
}
} else {
next;
}
} else {
$self->tee_( $client, "-ERR No secure server specified$eol" );
}
next;
}
if ( $command =~ /AUTH/i ) {
if ( $self->config_( 'secure_server' ) ne '' ) {
if ( $mail = $self->verify_connected_( $mail, $client, # PROFILE BLOCK START
$self->config_( 'secure_server' ),
$self->config_( 'secure_port' ) ) ) { # PROFILE BLOCK STOP
my $response = $self->echo_response_($mail, $client, "AUTH" );
last if ( $response == 2 );
if ( $response == 0 ) {
$self->echo_to_dot_( $mail, $client );
}
} else {
next;
}
} else {
$self->tee_( $client, "-ERR No secure server specified$eol" );
}
next;
}
# The client is requesting a LIST/UIDL of the messages
if ( ( $command =~ /LIST ?(.*)?/i ) || # PROFILE BLOCK START
( $command =~ /UIDL ?(.*)?/i ) ) { # PROFILE BLOCK STOP
my $response = $self->echo_response_($mail, $client, $command );
last if ( $response == 2 );
if ( $response == 0 ) {
$self->echo_to_dot_( $mail, $client ) if ( $1 eq '' );
}
next;
}
# TOP handling is rather special because we have three cases
# that we handle
#
# 1. If the client sends TOP x 99999999 then it is most likely
# to be fetchmail and the intent of fetchmail is to
# actually get the message but for its own reasons it does
# not use RETR. We use RETR as the clue to place a message
# in the history, so we have a hack. If the client looks
# like fetchmail then TOP x 99999999 is actually
# implemented using RETR
#
# 2. The toptoo configuration controls whether email
# downloaded using the TOP command is classified or not (It
# may be downloaded and cached for bandwidth efficiency, and
# thus appear in the history). There are two cases:
#
# 2a If toptoo is 0 then POPFile will pass a TOP from the
# client through as a TOP and do no classification on the
# message.
#
# 2b If toptoo is 1 then POPFile first does a RETR on the
# message and saves it in the history so that it can get the
# classification on the message which is stores in $class.
# Then it gets the message again by sending the TOP command
# and passing the result through classify_and_modify passing
# in the $class determined above. This means that the message
# gets the right classification and the client only gets the
# headers requested plus so many lines of body, but they will
# get subject modification, and the XTC and XPL headers add.
# Note that TOP always returns the full headers and then n
# lines of the body so we are guaranteed to be able to do our
# header modifications.
#
# NOTE messages retrieved using TOPTOO are visible in the
# history as they are "cached" to avoid requiring repeated
# downloads if the client issues a RETR for the message in
# the same session
#
# NOTE using toptoo=1 on a slow link could cause
# performance problems, in cases where only the headers,
# but not classification, is required. toptoo=1 is,
# however, appropriate for normal use via a mail client and
# won't significantly increase bandwidth unless the mail
# client is selectively downloading messages based on
# non-classification data in the TOP headers.
if ( $command =~ /TOP (.*) (.*)/i ) {
my $count = $1;
if ( $2 ne '99999999' ) {
if ( $self->config_( 'toptoo' ) == 1 ) {
my $response = # PROFILE BLOCK START
$self->echo_response_( $mail, $client, "RETR $count" ); # PROFILE BLOCK STOP
last if ( $response == 2 );
if ( $response == 0 ) {
# Classify without echoing to client, saving
# file for later RETR's
my ( $class, $slot ) = # PROFILE BLOCK START
$self->{classifier__}->classify_and_modify(
$session, $mail, $client, 0, '', 0, 0 ); # PROFILE BLOCK STOP
$downloaded{$count}{slot} = $slot;
$downloaded{$count}{class} = $class;
# Note that the 1 here indicates that
# echo_response_ does not send the response to
# the client. The +OK has already been sent
# by the RETR
$response = # PROFILE BLOCK START
$self->echo_response_( $mail, $client,
$command, 1 ); # PROFILE BLOCK STOP
last if ( $response == 2 );
if ( $response == 0 ) {
# Classify with pre-defined class, without
# saving, echoing to client
$self->{classifier__}->classify_and_modify( # PROFILE BLOCK START
$session, $mail, $client, 1, $class, $slot, 1 ); # PROFILE BLOCK STOP
}
}
} else {
my $response = # PROFILE BLOCK START
$self->echo_response_( $mail, $client, $command ); # PROFILE BLOCK STOP
last if ( $response == 2 );
if ( $response == 0 ) {
$self->echo_to_dot_( $mail, $client );
}
}
next;
}
# Note the fall through here. Later down the page we look
# for TOP x 99999999 and do a RETR instead
}
# The CAPA command
if ( $command =~ /CAPA/i ) {
if ( $mail || $self->config_( 'secure_server' ) ne '' ) {
if ( $mail || ( $mail = $self->verify_connected_( $mail, $client, # PROFILE BLOCK START
$self->config_( 'secure_server' ),
$self->config_( 'secure_port' ) ) ) ) { # PROFILE BLOCK STOP
my $response = $self->echo_response_($mail, $client, "CAPA" );
last if ( $response == 2 );
if ( $response == 0 ) {
$self->echo_to_dot_( $mail, $client );
}
} else {
next;
}
} else {
$self->tee_( $client, "-ERR No secure server specified$eol" );
}
next;
}
# The HELO command results in a very simple response from us.
# We just echo that we are ready for commands
if ( $command =~ /HELO/i ) {
$self->tee_( $client, "+OK HELO POPFile Server Ready$eol" );
next;
}
# In the case of PASS, NOOP, XSENDER, STAT, DELE and RSET
# commands we simply pass it through to the real mail server
# for processing and echo the response back to the client
if ( ( $command =~ /NOOP/i ) || # PROFILE BLOCK START
( $command =~ /STAT/i ) ||
( $command =~ /XSENDER (.*)/i ) ||
( $command =~ /DELE (.*)/i ) ||
( $command =~ /RSET/i ) ) { # PROFILE BLOCK STOP
last if ( $self->echo_response_($mail, $client, $command ) == 2 );
next;
}
# The client is requesting a specific message. Note the
# horrible hack here where we detect a command of the form TOP
# x 99999999 this is done so that fetchmail can be used with
# POPFile.
if ( ( $command =~ /RETR (.*)/i ) || ( $command =~ /TOP (.*) 99999999/i ) ) {
my $count = $1;
my $class;
my $file;
if ( defined($downloaded{$count}) && # PROFILE BLOCK START
( $file = $self->{history__}->get_slot_file(
$downloaded{$count}{slot} ) ) &&
( open RETRFILE, "<$file" ) ) { # PROFILE BLOCK STOP
# act like a network stream
binmode RETRFILE;
# File has been fetched and classified already
$self->log_( 1, "Printing message from cache" );
# Give the client an +OK:
$self->tee_( $client, "+OK " . ( -s $file ) . " bytes from POPFile cache$eol" );
# echo file, inserting known classification,
# without saving
( $class, undef ) = $self->{classifier__}->classify_and_modify( # PROFILE BLOCK START
$session, \*RETRFILE, $client, 1,
$downloaded{$count}{class},
$downloaded{$count}{slot} ); # PROFILE BLOCK STOP
print $client ".$eol";
close RETRFILE;
} else {
# Retrieve file directly from the server
# Get the message from the remote server, if there's
# an error then we're done, but if not then we echo
# each line of the message until we hit the . at the
# end
my $response = $self->echo_response_($mail, $client, $command );
last if ( $response == 2 );
if ( $response == 0 ) {
my $slot;
( $class, $slot ) = # PROFILE BLOCK START
$self->{classifier__}->classify_and_modify(
$session, $mail, $client, 0, '', 0 ); # PROFILE BLOCK STOP
# Note locally that file has been retrieved if the
# full thing has been saved to disk
$downloaded{$count}{slot} = $slot;
$downloaded{$count}{class} = $class;
}
}
next;
}
# The mail client wants to stop using the server, so send that
# message through to the real mail server, echo the response
# back up to the client and exit the while. We will close the
# connection immediately
if ( $command =~ /QUIT/i ) {
if ( $mail ) {
last if ( $self->echo_response_( $mail, $client, $command ) == 2 );
close $mail;
} else {
$self->tee_( $client, "+OK goodbye$eol" );
}
last;
}
# Don't know what this is so let's just pass it through and
# hope for the best
if ( $mail && $mail->connected ) {
last if ( $self->echo_response_($mail, $client, $command ) == 2 );
next;
} else {
$self->tee_( $client, "-ERR unknown command or bad syntax$eol" );
next;
}
}
if ( defined( $mail ) ) {
$self->done_slurp_( $mail );
close $mail;
}
close $client;
$self->mq_post_( 'CMPLT', $$ );
$self->log_( 0, "POP3 proxy done" );
}
# ----------------------------------------------------------------------------
#
# configure_item
#
# $name Name of this item
# $templ The loaded template that was passed as a parameter
# when registering
# $language Current language
#
# ----------------------------------------------------------------------------
sub configure_item
{
my ( $self, $name, $templ, $language ) = @_;
if ( $name eq 'pop3_configuration' ) {
$templ->param( 'POP3_Configuration_If_Force_Fork' => ( $self->config_( 'force_fork' ) == 0 ) );
$templ->param( 'POP3_Configuration_Port' => $self->config_( 'port' ) );
$templ->param( 'POP3_Configuration_Separator' => $self->config_( 'separator' ) );
} else {
if ( $name eq 'pop3_security' ) {
$templ->param( 'POP3_Security_Local' => ( $self->config_( 'local' ) == 1 ) );
} else {
if ( $name eq 'pop3_chain' ) {
$templ->param( 'POP3_Chain_Secure_Server' => $self->config_( 'secure_server' ) );
$templ->param( 'POP3_Chain_Secure_Port' => $self->config_( 'secure_port' ) );
} else {
$self->SUPER::configure_item( $name, $templ, $language );
}
}
}
}
# ----------------------------------------------------------------------------
#
# validate_item
#
# $name The name of the item being configured, was passed in by the call
# to register_configuration_item
# $templ The loaded template
# $language The language currently in use
# $form Hash containing all form items
#
# ----------------------------------------------------------------------------
sub validate_item
{
my ( $self, $name, $templ, $language, $form ) = @_;
if ( $name eq 'pop3_configuration' ) {
if ( defined($$form{pop3_port}) ) {
if ( ( $$form{pop3_port} >= 1 ) && ( $$form{pop3_port} < 65536 ) && ( $self->module_config_( 'html', 'port' ) ne $$form{pop3_port} ) ) {
$self->config_( 'port', $$form{pop3_port} );
$templ->param( 'POP3_Configuration_If_Port_Updated' => 1 );
$templ->param( 'POP3_Configuration_Port_Updated' => sprintf( $$language{Configuration_POP3Update}, $self->config_( 'port' ) ) );
} else {
if ( ( $self->module_config_( 'html', 'port' ) ne $$form{pop3_port} ) ) {
$templ->param( 'POP3_Configuration_If_Port_Error' => 1 );
} else {
$templ->param( 'POP3_Configuration_If_UI_Port_Error' => 1 );
}
}
}
if ( defined($$form{pop3_separator}) ) {
if ( length($$form{pop3_separator}) == 1 ) {
$self->config_( 'separator', $$form{pop3_separator} );
$templ->param( 'POP3_Configuration_If_Sep_Updated' => 1 );
$templ->param( 'POP3_Configuration_Sep_Updated' => sprintf( $$language{Configuration_POP3SepUpdate}, $self->config_( 'separator' ) ) );
} else {
$templ->param( 'POP3_Configuration_If_Sep_Error' => 1 );
}
}
if ( defined($$form{pop3_force_fork}) ) {
$self->config_( 'force_fork', $$form{pop3_force_fork} );
}
return;
}
if ( $name eq 'pop3_security' ) {
$self->config_( 'local', $$form{pop3_local}-1 ) if ( defined($$form{pop3_local}) );
return;
}
if ( $name eq 'pop3_chain' ) {
if ( defined( $$form{server} ) ) {
$self->config_( 'secure_server', $$form{server} );
$templ->param( 'POP3_Chain_If_Server_Updated' => 1 );
$templ->param( 'POP3_Chain_Server_Updated' => sprintf( $$language{Security_SecureServerUpdate}, $self->config_( 'secure_server' ) ) );
}
if ( defined($$form{sport}) ) {
if ( ( $$form{sport} >= 1 ) && ( $$form{sport} < 65536 ) ) {
$self->config_( 'secure_port', $$form{sport} );
$templ->param( 'POP3_Chain_If_Port_Updated' => 1 );
$templ->param( 'POP3_Chain_Port_Updated' => sprintf( $$language{Security_SecurePortUpdate}, $self->config_( 'secure_port' ) ) );
} else {
$templ->param( 'POP3_Chain_If_Port_Error' => 1 );
}
}
return;
}
$self->SUPER::validate_item( $name, $templ, $language, $form );
}
1;
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