/usr/share/perl5/INetSim/SMTP.pm is in inetsim 1.2.7+dfsg.1-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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#
# INetSim::SMTP - A fake SMTP server
#
# RFC 821/2821 - SIMPLE MAIL TRANSFER PROTOCOL (SMTP)
#
# (c)2007-2014 Matthias Eckert, Thomas Hungenberg
#
# Version 0.90 (2014-05-23)
#
# For history/changelog see bottom of this file.
#
#############################################################
package INetSim::SMTP;
use strict;
use warnings;
use base qw(INetSim::GenericServer);
use MIME::Base64;
use Digest::SHA;
my $SSL = 0;
eval { require IO::Socket::SSL; };
if (! $@) { $SSL = 1; };
# http://www.iana.org/assignments/mail-parameters
my %EXT_AVAIL = ( "HELP" => 1, # RFC 821, 2821
"SEND" => 1, # RFC 821, 2821
"SAML" => 1, # RFC 821, 2821
"SOML" => 1, # RFC 821, 2821
"VRFY" => 1, # RFC 821, 2821
"EXPN" => 1, # RFC 821, 2821
"TURN" => 1, # RFC 821, 2821
"DSN" => 1, # RFC 3461
"ETRN" => 1, # RFC 1985
"VERP" => 1, # http://tools.ietf.org/html/draft-varshavchik-verp-smtpext-00
"MTRK" => 1, # RFC 3885
"SIZE" => 2, # RFC 1870
"AUTH" => 2, # RFC 4954
"8BITMIME" => 1, # RFC 1652
"DELIVERBY" => 2, # RFC 2852
"SUBMITTER" => 1, # RFC 4405
"NO-SOLICITING" => 2, # RFC 3865
"FUTURERELEASE" => 2, # RFC 4865
"ENHANCEDSTATUSCODES" => 1, # RFC 2034
"ATRN" => 1, # RFC 2645
"VERB" => 0, # no RFC available (sendmail specific ?)
"ONEX" => 0, # no RFC available (sendmail specific ?)
"CHUNKING" => 1, # RFC 3030
"BINARYMIME" => 1, # RFC 3030
"CHECKPOINT" => 1, # RFC 1845
"PIPELINING" => 0, # RFC 2920
"STARTTLS" => 1, # RFC 3207 (2487)
"UTF8SMTP" => 0 # RFC 5336
);
# status: 24 of 28 :-)
my %MAIL_AVAIL = ( "DSN" => "RET,ENVID",
"VERP" => "VERP",
"MTRK" => "MTRK,ENVID",
"SIZE" => "SIZE",
"8BITMIME" => "BODY",
"DELIVERBY" => "BY",
"SUBMITTER" => "SUBMITTER",
"NO-SOLICITING" => "SOLICIT",
"FUTURERELEASE" => "HOLDFOR,HOLDUNTIL",
"BINARYMIME" => "BODY",
"CHECKPOINT" => "TRANSID",
"UTF8SMTP" => "ALT-ADDRESS",
"AUTH" => "AUTH"
);
my %RCPT_AVAIL = ( "DSN" => "NOTIFY,ORCPT",
"MTRK" => "ORCPT",
"UTF8SMTP" => "ALT-ADDRESS"
);
my %VRFY_AVAIL = ( "UTF8SMTP" => "UTF8REPLY"
);
my %EXPN_AVAIL = ( "UTF8SMTP" => "UTF8REPLY"
);
my %SMTP_EXT = ();
my @RECIPIENTS = ();
my %MAIL_PARAM = ();
my %RCPT_PARAM = ();
my %VRFY_PARAM = ();
my %EXPN_PARAM = ();
my %status;
sub configure_hook {
my $self = shift;
$self->{server}->{host} = &INetSim::Config::getConfigParameter("Default_BindAddress"); # bind to address
$self->{server}->{proto} = 'tcp'; # TCP protocol
$self->{server}->{user} = &INetSim::Config::getConfigParameter("Default_RunAsUser"); # user to run as
$self->{server}->{group} = &INetSim::Config::getConfigParameter("Default_RunAsGroup"); # group to run as
$self->{server}->{setsid} = 0; # do not daemonize
$self->{server}->{no_client_stdout} = 1; # do not attach client to STDOUT
$self->{server}->{log_level} = 0; # do not log anything
# cert directory
$self->{cert_dir} = &INetSim::Config::getConfigParameter("CertDir");
if (defined $self->{server}->{'SSL'} && $self->{server}->{'SSL'}) {
$self->{servicename} = &INetSim::Config::getConfigParameter("SMTPS_ServiceName");
if (! $SSL) {
&INetSim::Log::MainLog("failed! Library IO::Socket::SSL not installed", $self->{servicename});
exit 1;
}
$self->{ssl_key} = $self->{cert_dir} . (defined &INetSim::Config::getConfigParameter("SMTPS_KeyFileName") ? &INetSim::Config::getConfigParameter("SMTPS_KeyFileName") : &INetSim::Config::getConfigParameter("Default_KeyFileName"));
$self->{ssl_crt} = $self->{cert_dir} . (defined &INetSim::Config::getConfigParameter("SMTPS_CrtFileName") ? &INetSim::Config::getConfigParameter("SMTPS_CrtFileName") : &INetSim::Config::getConfigParameter("Default_CrtFileName"));
$self->{ssl_dh} = (defined &INetSim::Config::getConfigParameter("SMTPS_DHFileName") ? &INetSim::Config::getConfigParameter("SMTPS_DHFileName") : &INetSim::Config::getConfigParameter("Default_DHFileName"));
if (! -f $self->{ssl_key} || ! -r $self->{ssl_key} || ! -f $self->{ssl_crt} || ! -r $self->{ssl_crt} || ! -s $self->{ssl_key} || ! -s $self->{ssl_crt}) {
&INetSim::Log::MainLog("failed! Unable to read SSL certificate files", $self->{servicename});
exit 1;
}
$self->{ssl_enabled} = 1;
$self->{server}->{port} = &INetSim::Config::getConfigParameter("SMTPS_BindPort"); # bind to port
# ESMTP
$self->{ESMTP} = &INetSim::Config::getConfigParameter("SMTPS_Extended_SMTP");
# reversible authentication mechanisms only
$self->{auth_reversible_only} = &INetSim::Config::getConfigParameter("SMTPS_AuthReversibleOnly");
# force authentication
$self->{auth_required} = &INetSim::Config::getConfigParameter("SMTPS_AuthRequired");
# mbox file
$self->{mboxFile} = &INetSim::Config::getConfigParameter("SMTPS_MBOXFileName");
$self->{mboxFile} =~ /^(.*)\z/; # evil untaint!
$self->{mboxFile} = $1;
# smtp banner
$self->{banner} = &INetSim::Config::getConfigParameter("SMTPS_Banner");
# fqdn hostname
$self->{fqdn_hostname} = &INetSim::Config::getConfigParameter("SMTPS_FQDN_Hostname");
# helo/ehlo required
$self->{helo_required} = &INetSim::Config::getConfigParameter("SMTPS_HELO_required");
}
else {
$self->{servicename} = &INetSim::Config::getConfigParameter("SMTP_ServiceName");
$self->{ssl_key} = $self->{cert_dir} . (defined &INetSim::Config::getConfigParameter("SMTP_KeyFileName") ? &INetSim::Config::getConfigParameter("SMTP_KeyFileName") : &INetSim::Config::getConfigParameter("Default_KeyFileName"));
$self->{ssl_crt} = $self->{cert_dir} . (defined &INetSim::Config::getConfigParameter("SMTP_CrtFileName") ? &INetSim::Config::getConfigParameter("SMTP_CrtFileName") : &INetSim::Config::getConfigParameter("Default_CrtFileName"));
$self->{ssl_dh} = (defined &INetSim::Config::getConfigParameter("SMTP_DHFileName") ? &INetSim::Config::getConfigParameter("SMTP_DHFileName") : &INetSim::Config::getConfigParameter("Default_DHFileName"));
$self->{ssl_enabled} = 0;
$self->{server}->{port} = &INetSim::Config::getConfigParameter("SMTP_BindPort"); # bind to port
# ESMTP
$self->{ESMTP} = &INetSim::Config::getConfigParameter("SMTP_Extended_SMTP");
# reversible authentication mechanisms only
$self->{auth_reversible_only} = &INetSim::Config::getConfigParameter("SMTP_AuthReversibleOnly");
# force authentication
$self->{auth_required} = &INetSim::Config::getConfigParameter("SMTP_AuthRequired");
# mbox file
$self->{mboxFile} = &INetSim::Config::getConfigParameter("SMTP_MBOXFileName");
$self->{mboxFile} =~ /^(.*)\z/; # evil untaint!
$self->{mboxFile} = $1;
# smtp banner
$self->{banner} = &INetSim::Config::getConfigParameter("SMTP_Banner");
# fqdn hostname
$self->{fqdn_hostname} = &INetSim::Config::getConfigParameter("SMTP_FQDN_Hostname");
# helo/ehlo required
$self->{helo_required} = &INetSim::Config::getConfigParameter("SMTP_HELO_required");
}
# warn about missing dh file and disable
if (defined $self->{ssl_dh} && $self->{ssl_dh}) {
$self->{ssl_dh} = $self->{cert_dir} . $self->{ssl_dh};
if (! -f $self->{ssl_dh} || ! -r $self->{ssl_dh}) {
&INetSim::Log::MainLog("Warning: Unable to read Diffie-Hellman parameter file '$self->{ssl_dh}'", $self->{servicename});
$self->{ssl_dh} = undef;
}
}
my ($dev, $inode, $mode, $nlink, $uid, $gid, $rdev, $size, $atime, $mtime, $ctime, $blksize, $blocks, $grpname) = undef;
# timeout
$self->{timeout} = &INetSim::Config::getConfigParameter("Default_TimeOut");
# max childs
$self->{maxchilds} = &INetSim::Config::getConfigParameter("Default_MaxChilds");
if (! open (DAT, ">> $self->{mboxFile}")) {
&INetSim::Log::MainLog("Warning: Unable to open SMTP mbox file '$self->{mboxFile}': $!", $self->{servicename});
}
else {
close DAT;
chmod 0660, $self->{mboxFile};
$gid = getgrnam("inetsim");
if (! defined $gid) {
&INetSim::Log::MainLog("Warning: Unable to get GID for group 'inetsim'", $self->{servicename});
}
chown -1, $gid, $self->{mboxFile};
($dev, $inode, $mode, $nlink, $uid, $gid, $rdev, $size, $atime, $mtime, $ctime, $blksize, $blocks) = stat $self->{mboxFile};
$grpname = getgrgid $gid;
# check for group owner 'inetsim'
if ($grpname ne "inetsim") {
&INetSim::Log::MainLog("Warning: Group owner of SMTP mbox file '$self->{mboxFile}' is not 'inetsim' but '$grpname'", $self->{servicename});
}
# check for group r/w permissions
if ((($mode & 0060) >> 3) != 6) {
&INetSim::Log::MainLog("Warning: No group r/w permissions on SMTP mbox file '$self->{mboxFile}'", $self->{servicename});
}
}
# register configured (and available) service extensions and guess the mail transmission type
$self->register_extensions;
# just a gimmick: simple replacing the word xSMTPx in the banner string with the mail transmission type ;-)
if ($self->{banner} =~ /^(|.*\s)xSMTPx(|\s.*)\z/) {
$self->{banner} =~ s/xSMTPx/$self->{mailTransmissionType}/;
}
}
sub pre_loop_hook {
my $self = shift;
$0 = 'inetsim_' . $self->{servicename};
&INetSim::Log::MainLog("started (PID $$)", $self->{servicename});
}
sub pre_server_close_hook {
my $self = shift;
&INetSim::Log::MainLog("stopped (PID $$)", $self->{servicename});
}
sub fatal_hook {
my $self = shift;
&INetSim::Log::MainLog("failed!", $self->{servicename});
exit 1;
}
sub process_request {
my $self = shift;
my $client = $self->{server}->{client};
# status, counters ...
$status{success} = 0;
$status{auth_type} = "";
$status{credentials} = "";
$status{count_mails} = 0;
$status{count_bytes} = 0;
$status{count_recipients} = 0;
$status{tls_used} = 0;
$status{tls_cipher} = "";
# flags
$self->{EHLO} = 0;
$self->{auth_given} = 0;
$self->{helo_given} = 0;
$self->{sender_given} = 0;
$self->{recipient_given} = 0;
$self->{transaction} = 0;
$self->{bdat_last} = 0;
$self->{bdat_incomplete} = 0;
$self->{using_tls} = 0;
# other
@RECIPIENTS = ();
$self->{envelope_sender} = undef;
$self->{envelope_recipient} = undef;
$self->{transaction_type} = "";
$self->{body_mime} = "";
$self->{bdat_content} = "";
$self->{size} = 0;
$self->{transid} = "";
if ($self->{ssl_enabled} && ! $self->upgrade_to_ssl()) {
$self->slog_("connect");
$self->slog_("info: Error setting up SSL: $self->{last_ssl_error}");
$self->slog_("disconnect");
}
elsif ($self->{server}->{numchilds} >= $self->{maxchilds}) {
$self->slog_("connect");
$self->send_(421, "Maximum number of connections ($self->{maxchilds}) exceeded.", "4.3.2");
$self->slog_("disconnect");
}
else {
my $line = "";
eval {
local $SIG{'ALRM'} = sub { die "TIMEOUT" };
alarm($self->{timeout});
$self->slog_("connect");
### Server Greeting
$self->send_(220, "$self->{fqdn_hostname} $self->{banner}");
# wait for command
while ($line = <$client>) {
chomp($line);
$line =~ s/\r$//g;
$line =~ s/[\r\n]+//g;
$line =~ s/[\t]/\ /g;
alarm($self->{timeout});
$self->slog_("recv: $line");
### HELO
if ($line =~ /^HELO(|([\s]+)(.*))$/i) {
$self->HELO($3);
}
### EHLO
elsif ($self->{ESMTP} && $line =~ /^EHLO(|([\s]+)(.*))$/i) {
$self->EHLO($3);
}
### MAIL or SEND or SOML or SAML
elsif ($line =~ /^(MAIL|SEND|SOML|SAML)(|([\s]+)(.*))$/i) {
$self->MAIL(uc($1), $4);
}
### RCPT
elsif ($line =~ /^RCPT(|([\s]+)(.*))$/i) {
$self->RCPT($3);
}
### DATA
elsif ($line =~ /^DATA(|([\s]+)(.*))$/i) {
$self->DATA($3);
}
### RSET
elsif ($line =~ /^RSET(|([\s]+)(.*))$/i) {
$self->RSET($3);
}
### NOOP
elsif ($line =~ /^NOOP(|([\s]+)(.*))$/i) {
$self->NOOP($3);
}
### QUIT
elsif ($line =~ /^QUIT(|([\s]+)(.*))$/i) {
$self->QUIT($3);
}
### VRFY
elsif ($line =~ /^VRFY(|([\s]+)(.*))$/i) {
$self->VRFY($3);
}
### EXPN
elsif (defined $SMTP_EXT{EXPN} && $line =~ /^EXPN(|([\s]+)(.*))$/i) {
$self->EXPN($3);
}
### HELP
elsif (defined $SMTP_EXT{HELP} && $line =~ /^HELP(|([\s]+)(.*))$/i) {
$self->HELP($3);
}
### TURN
elsif (defined $SMTP_EXT{TURN} && $line =~ /^TURN(|([\s]+)(.*))$/i) {
$self->TURN("TURN", $3);
}
### ATRN
elsif ($self->{ESMTP} && defined $SMTP_EXT{ATRN} && $line =~ /^ATRN(|([\s]+)(.*))$/i) {
$self->TURN("ATRN", $3);
}
### ETRN
elsif ($self->{ESMTP} && defined $SMTP_EXT{ETRN} && $line =~ /^ETRN(|([\s]+)(.*))$/i) {
$self->ETRN($3);
}
### AUTH
elsif ($self->{ESMTP} && defined $SMTP_EXT{AUTH} && $line =~ /^AUTH(|([\s]+)(.*))$/i) {
$self->AUTH($3);
}
### BDAT
elsif ($self->{ESMTP} && defined $SMTP_EXT{CHUNKING} && $line =~ /^BDAT(|([\s]+)(.*))$/i) {
$self->BDAT($3);
}
### STARTTLS
elsif ($self->{ESMTP} && defined $SMTP_EXT{STARTTLS} && $line =~ /^STARTTLS(|([\s]+)(.*))$/i) {
$self->STARTTLS($3);
}
### unknown
else {
$self->send_(500, "Error: unknown command", "5.5.1");
}
last if ($self->{close_connection});
alarm($self->{timeout});
}
};
alarm(0);
if ($@ =~ /TIMEOUT/) {
$self->send_(421, "Error: timeout exceeded", "4.4.2");
$self->slog_("disconnect (timeout)");
}
else {
if (defined ($self->{timed_out}) && $self->{timed_out}) { # only needed for turn/atrn
$self->slog_("disconnect (timeout)");
}
else {
$self->slog_("disconnect");
}
}
# connection lost ? write incomplete, checkpointed message
if ($self->{transid} && $self->{data_incomplete} && $self->{data_content}) {
$self->write_message($self->{data_content});
}
}
if ($status{success} == 1) {
$status{count_recipients} = @RECIPIENTS; # sum of all recipients !
$self->slog_("stat: $status{success} mails=$status{count_mails} recips=$status{count_recipients} auth=$status{auth_type} creds=$status{credentials} bytes=$status{count_bytes} tls=$status{tls_used} cipher=$status{tls_cipher}");
}
else {
$self->slog_("stat: $status{success}");
}
}
sub slog_ {
my ($self, $msg) = @_;
my $rhost = $self->{server}->{peeraddr};
my $rport = $self->{server}->{peerport};
if (defined ($msg)) {
$msg =~ s/[\r\n]*//;
&INetSim::Log::SubLog("[$rhost:$rport] $msg", $self->{servicename}, $$);
}
}
sub send_ {
my ($self, $code, $msg, $ecode) = @_;
my $client = $self->{server}->{client};
if (defined ($code) && $code ne "" && defined ($msg) && $msg ne "") {
alarm($self->{timeout});
$msg =~ s/[\r\n]*//;
# workaround for non-multiline replies
if ($code =~ /\d$/) {
$code .= " ";
}
if ($self->{ESMTP} && defined ($SMTP_EXT{ENHANCEDSTATUSCODES}) && defined ($ecode) && $ecode ne "" && $ecode =~ /^(2|4|5)/ && substr($code, 0, 1) eq substr($ecode, 0, 1)) {
print $client "$code$ecode $msg\r\n";
$self->slog_("send: $code$ecode $msg");
}
elsif ($code =~ /^000/) {
print $client "$msg\r\n";
$self->slog_("send: $msg");
}
else {
print $client "$code$msg\r\n";
$self->slog_("send: $code$msg");
}
alarm($self->{timeout});
}
}
sub recv_ {
my $self = shift;
my $client = $self->{server}->{client};
my $line;
alarm($self->{timeout});
$line = <$client>;
alarm($self->{timeout});
if (! defined ($line)) {
$line = "";
}
chomp($line);
$line =~ s/\r$//g;
$line =~ s/[\r\n]+//g;
$self->slog_("recv: $line");
return $line;
}
sub HELO {
my ($self, $args) = @_;
if (! defined $args || ! $args || $args =~ /^[\s\t]+\z/) {
$self->syntax("HELO");
return;
}
# (re)set variables
$self->{EHLO} = 0;
$self->{helo_given} = 1;
$self->{sender_given} = 0;
$self->{recipient_given} = 0;
$self->{envelope_sender} = undef;
$self->{envelope_recipient} = undef;
$self->{transaction} = 0;
$self->{transaction_type} = "";
$self->{bdat_last} = 0;
$self->{bdat_content} = "";
$self->{bdat_incomplete} = 0;
$self->{body_mime} = "";
# output
$self->send_(250, $self->{fqdn_hostname});
}
sub EHLO {
my ($self, $args) = @_;
my @out = ();
my $last;
if (! defined $args || ! $args || $args =~ /^[\s\t]+\z/) {
$self->syntax("EHLO");
return;
}
# (re)set variables
$self->{EHLO} = 1;
$self->{helo_given} = 1;
$self->{sender_given} = 0;
$self->{recipient_given} = 0;
$self->{envelope_sender} = undef;
$self->{envelope_recipient} = undef;
$self->{transaction} = 0;
$self->{transaction_type} = "";
$self->{bdat_last} = 0;
$self->{bdat_content} = "";
$self->{bdat_incomplete} = 0;
$self->{body_mime} = "";
# do multiline output
push (@out, $self->{fqdn_hostname});
foreach (keys %SMTP_EXT) {
if ($SMTP_EXT{$_} ne "") {
push (@out, "$_ $SMTP_EXT{$_}");
}
else {
push (@out, "$_");
}
}
$last = pop(@out);
foreach (@out) {
$self->send_("250-", "$_");
}
$self->send_(250, $last);
}
sub MAIL {
my ($self, $cmd, $args) = @_;
if ($cmd ne "MAIL" && ! defined $SMTP_EXT{$cmd}) {
$self->send_(500, "Error: unknown command", "5.5.1");
return;
}
return if $self->helo_required;
return if $self->auth_required;
if (! defined $args || ! $args || $args =~ /^[\s\t]+\z/ || $args !~ /^FROM:/i) {
$self->syntax($cmd);
return;
}
$args =~ s/^FROM:([\s\t]+)?//i;
my $sender = $self->get_parameters("MAIL", $args);
# address invalid -> syntax error
if (! defined $sender) {
$self->syntax($cmd);
return;
}
# unknown option/parameter
if ($self->{invalid_keyword}) {
$self->send_(555, "Error: Unsupported option", "5.5.4");
return;
}
# look for body parameter
if (defined ($MAIL_PARAM{BODY}) && $MAIL_PARAM{BODY} =~ /^BINARYMIME/i) {
$self->{body_mime} = "binary";
}
elsif (defined ($MAIL_PARAM{BODY}) && $MAIL_PARAM{BODY} =~ /^7BIT/i) {
$self->{body_mime} = "7bit";
}
elsif (defined ($MAIL_PARAM{BODY}) && $MAIL_PARAM{BODY} =~ /^8BITMIME/i) {
$self->{body_mime} = "8bit";
}
else {
$self->{body_mime} = "";
}
# look for transaction id parameter
if (defined ($MAIL_PARAM{TRANSID}) && $MAIL_PARAM{TRANSID} ne "") {
$self->{transid} = $MAIL_PARAM{TRANSID};
}
else {
$self->{transid} = "";
}
# look for size parameter
if (defined ($MAIL_PARAM{SIZE}) && $MAIL_PARAM{SIZE} =~ /^([\d]+)/) {
$self->{size} = $1;
}
else {
$self->{size} = 0;
}
if ($sender =~ /^\<([\s]+)?\>$/) {
# substitue '<>' with 'MAILER-DAEMON'
$sender = "MAILER-DAEMON";
}
else {
# remove '<' and '>'
$sender =~ s/\<(.*)\>/$1/g;
}
if (defined $self->{size} && $self->{size} && $self->{size} > $self->{max_message_size}) {
$self->send_(552, "Error: Message exceeds maximum size", "5.2.3");
return;
}
if ($self->{transaction_type} eq "bdat") {
$self->send_(503, "Error: bad sequence of commands", "5.5.1");
return;
}
if (! defined $sender || $sender eq "") {
$self->syntax("MAIL");
return;
}
# body=binarymime not allowed without binarymime extension
if (! defined $SMTP_EXT{BINARYMIME} && $self->{body_mime} eq "binary") {
$self->send_(555, "Error: Unsupported option", "5.5.4");
return;
}
$self->{sender_given} = 1;
$self->{envelope_sender} = $sender;
$self->{recipient_given} = 0;
$self->{envelope_recipient} = undef;
$self->{transaction} = 1;
# check for transid parameter
if ($self->{transid}) {
# searching for checkpoint
$self->search_checkpoint($self->{transid}, $sender);
# ok, checkpoint found
if ($self->{checkpoint_found}) {
$self->{recipient_given} = 1;
# send code 355 and the offset
$self->send_(355, "$self->{transaction_offset} is the transaction offset");
return;
}
}
$self->send_(250, "Ok", "2.1.0");
}
sub RCPT {
my ($self, $args) = @_;
return if $self->helo_required;
return if $self->auth_required;
if (! defined $args || ! $args || $args =~ /^[\s\t]+\z/ || $args !~ /^TO:/i) {
$self->syntax("RCPT");
return;
}
if (! $self->{sender_given}) {
$self->send_(503, "Error: need MAIL command", "5.5.1");
return;
}
if ($self->{transaction_type} eq "bdat") {
$self->send_(503, "Error: bad sequence of commands", "5.5.1");
return;
}
$args =~ s/^TO:([\s\t]+)?//i;
my $recipient = $self->get_parameters("RCPT", $args);
# address invalid -> syntax error
if (! defined $recipient) {
$self->syntax("RCPT");
return;
}
# unknown option/parameter
if ($self->{invalid_keyword}) {
$self->send_(555, "Error: Unsupported option", "5.5.4");
return;
}
if ($recipient =~ /^\<([\s]+)?\>$/) {
# substitute '<>' with 'POSTMASTER'
$recipient = "POSTMASTER";
}
else {
# remove '<' and '>'
$recipient =~ s/\<(.*)\>/$1/g;
}
if (! defined $recipient || $recipient eq "") {
$self->syntax("RCPT");
return;
}
if ($self->{transid} && $self->{checkpoint_found}) {
$self->{transid} = "";
}
$self->{recipient_given} = 1;
$self->{envelope_recipient} = $recipient if (! defined $self->{envelope_recipient});
push (@RECIPIENTS, $recipient);
$self->send_(250, "Ok", "2.1.5");
}
sub DATA {
my ($self, $args) = @_;
my $client = $self->{server}->{client};
my $data = "";
my $bytes = 0;
my $queueid;
my $err_size = 0;
return if $self->helo_required;
return if $self->auth_required;
if (defined $args && $args && $args !~ /^[\s\t]+\z/) {
$self->syntax("DATA");
return;
}
if (! $self->{recipient_given}) {
$self->send_(503, "Error: need RCPT command", "5.5.1");
return;
}
if (! $self->{sender_given}) {
$self->send_(503, "Error: need MAIL command", "5.5.1");
return;
}
# check for running bdat transaction
if ($self->{transaction_type} eq "bdat") {
$self->send_(503, "Error: Bad sequence of commands", "5.5.1");
return;
}
# check for BINARYMIME flag, because it cannot be used with DATA
if ($self->{body_mime} eq "binary") {
$self->send_(503, "Error: Bad sequence of commands", "5.5.1");
return;
}
$self->{transaction_type} = "data";
$self->{data_content} = "";
$self->{data_incomplete} = 1;
if ($self->{transid}) {
if ($self->{checkpoint_found}) {
$self->send_(354, "Send previously checkpointed message starting at octet $self->{transaction_offset}");
}
else {
$self->send_(354, "Send checkpointed message, end data with <CR><LF>.<CR><LF>");
}
}
else {
$self->send_(354, "End data with <CR><LF>.<CR><LF>");
}
while (<$client>) {
alarm($self->{timeout});
if(/^\.[\r\n]*$/) {
$bytes = length($self->{data_content});
$status{count_mails}++;
$status{count_bytes} += $bytes;
$self->slog_("recv: <(MESSAGE)> ($bytes bytes)");
$self->slog_("recv: .");
$self->{data_incomplete} = 0;
$queueid = $self->write_message($self->{data_content});
$self->{transaction_type} = "";
$self->{sender_given} = 0;
$self->{recipient_given} = 0;
if ($err_size) {
$self->send_(452, "Error: Message size limit exceeded", "4.2.3");
$self->slog_("info: Message truncated");
return;
}
if (defined ($queueid)) {
$status{success} = 1;
$self->send_(250, "Ok: queued as $queueid", "2.6.0");
}
else {
$self->send_(451, "Error: local error in processing", "4.3.0");
}
return;
}
elsif ($err_size || ($self->{max_message_size} && length($self->{data_content}) > $self->{max_message_size})) {
$err_size = 1;
}
else {
$self->{data_content} .= $_;
}
alarm($self->{timeout});
}
}
sub BDAT {
my ($self, $args) = @_;
my $client = $self->{server}->{client};
my $message_size = 0;
my $chunk_length = 0;
my $bytes = 0;
my $received = "";
my $err_seq = 0;
my $err_size = 0;
my $fileName;
my @message = ();
return if $self->helo_required;
return if $self->auth_required;
if (! defined $args || ! $args || $args =~ /^[\s\t]+\z/) {
$self->syntax("BDAT");
return;
}
if (! $self->{recipient_given}) {
$self->send_(503, "Error: need RCPT command", "5.5.1");
return;
}
if (! $self->{sender_given}) {
$self->send_(503, "Error: need MAIL command", "5.5.1");
return;
}
if ($self->{transaction_type} eq "data") {
$self->send_(503, "Error: Bad sequence of commands", "5.5.1");
return;
}
if ($self->{transid}) {
$self->send_(503, "Error: Bad sequence of commands", "5.5.1");
return;
}
$args =~ s/^[\s]+//;
$args =~ s/[\s]+$//;
if ($args !~ /^([\d]+|LAST|[\d]+[\s]+LAST)$/i) {
$self->send_(501, "Error: invalid parameter syntax", "5.5.4");
return;
}
# quote from RFC:
# "Any BDAT command sent after the BDAT LAST is illegal and
# MUST be replied to with a 503 "Bad sequence of commands" reply code."
if ($self->{bdat_last}) {
$err_seq = 1;
}
$self->{transaction_type} = "bdat";
if ($args =~ /^([\d]+)$/) {
# more chunks follow after this chunk
$chunk_length = $1;
}
elsif ($args =~ /^([\d]+)[\s]+LAST$/i) {
# this is the last chunk, size is given
$self->{bdat_last} = 1;
$chunk_length = $1;
}
elsif ($args =~ /^LAST$/i) {
# this is the last chunk, no size parameter given
$self->{bdat_last} = 1;
$chunk_length = 0;
}
else {
$self->send_(501, "Error: invalid parameter syntax", "5.5.4");
# hmm, could be some kind of DoS -> close connection
$self->{close_connection} = 1;
}
# must receive all data, before return anything
while ($bytes < $chunk_length) {
alarm($self->{timeout});
$received = <$client>;
alarm($self->{timeout});
if (! defined ($received)) {
$received = "";
}
$bytes += length($received);
# if transaction is already completed or content reaches $maxlength, simply discard more data
if (! $err_seq) {
if ($bytes < $self->{max_chunk_length}) {
$self->{bdat_content} .= $received;
}
else {
$err_size = 1;
}
}
}
$self->slog_("recv: <(CHUNK)> ($bytes bytes)");
$message_size = length($self->{bdat_content});
if ($err_seq) {
$self->send_(503, "Error: Bad sequence of commands", "5.5.1");
}
elsif ($err_size) {
$self->send_(452, "Error: Chunk size limit exceeded", "4.2.3");
$self->slog_("info: Chunk truncated");
$self->{bdat_incomplete} = 1;
}
else {
if ($self->{bdat_last}) {
$self->{body_mime} = "";
if ($self->write_message($self->{bdat_content})) {
$status{count_bytes} += $message_size;
$status{count_mails}++;
if ($self->{max_message_size} && $message_size > $self->{max_message_size}) {
$self->send_(452, "Error: Message size limit exceeded", "4.2.3");
}
else {
$self->send_(250, "Message OK, $message_size octets received", "2.6.0");
}
if ($self->{bdat_incomplete}) {
$self->slog_("info: Message incomplete");
$self->{bdat_incomplete} = 0;
}
}
else {
$self->send_(451, "Error: local error in processing", "5.3.0");
}
}
else {
$self->send_(250, "$bytes octets received", "2.6.0");
}
}
}
sub RSET {
my ($self, $args) = @_;
if (defined $args && $args && $args !~ /^[\s\t]+\z/) {
$self->syntax("RSET");
return;
}
# reset variables
$self->{sender_given} = 0;
$self->{recipient_given} = 0;
$self->{envelope_sender} = undef;
$self->{envelope_recipient} = undef;
$self->{transaction} = 0;
$self->{transaction_type} = "";
$self->{bdat_last} = 0;
$self->{bdat_content} = "";
$self->{bdat_incomplete} = 0;
$self->{body_mime} = "";
# reply
$self->send_(250, "Ok", "2.0.0");
}
sub NOOP {
my ($self, $args) = @_;
if (defined $args && $args && $args !~ /^[\s\t]+\z/) {
$self->syntax("NOOP");
return;
}
# reply
$self->send_(250, "Ok", "2.0.0");
}
sub QUIT {
my ($self, $args) = @_;
# if (defined $args && $args && $args !~ /^[\s\t]+\z/) {
# $self->syntax("QUIT");
# return;
# }
$self->{close_connection} = 1;
# reply
$self->send_(221, "closing connection.", "2.0.0");
}
sub VRFY {
my ($self, $args) = @_;
if (! defined $SMTP_EXT{VRFY}) {
if ($self->{ESMTP}) {
$self->send_(502, "Error: command not implemented", "5.5.1");
}
else {
$self->send_(500, "Error: unknown command", "5.5.1");
}
return;
}
return if $self->auth_required;
if ($self->{transaction_type} eq "bdat") {
$self->send_(503, "Error: bad sequence of commands", "5.5.1");
return;
}
if (! defined $args || ! $args || $args =~ /^[\s\t]+\z/) {
$self->syntax("VRFY");
return;
}
my $address = $self->get_parameters("VRFY", $args);
# address invalid -> syntax error
if (! defined $address || $address eq "") {
$self->syntax("VRFY");
return;
}
# unknown option/parameter
if ($self->{invalid_keyword}) {
$self->send_(555, "Error: Unsupported option", "5.5.4");
return;
}
if ($address =~ /\<([\x21-\x7E]+)\>$/ || ($address !~ /[\<\>]/ && $address =~ /^([\x21-\x7E]+)$/)) {
$address = $1;
$address =~ s/[\<\>]//g;
$self->send_(252, $address, "2.0.0");
}
else {
$self->send_(501, "Bad address syntax", "5.1.3");
}
}
sub EXPN {
my ($self, $args) = @_;
return if $self->auth_required;
if ($self->{transaction_type} eq "bdat") {
$self->send_(503, "Error: bad sequence of commands", "5.5.1");
return;
}
if (! defined $args || ! $args || $args =~ /^[\s\t]+\z/) {
$self->syntax("EXPN");
return;
}
my $address = $self->get_parameters("EXPN", $args);
# address invalid -> syntax error
if (! defined $address || $address eq "") {
$self->syntax("EXPN");
return;
}
# unknown option/parameter
if ($self->{invalid_keyword}) {
$self->send_(555, "Error: Unsupported option", "5.5.4");
return;
}
if ($address =~ /([^a-zA-Z0-9\-\.\_\+\=\s])/) {
$self->send_(501, "Error: invalid parameter syntax", "5.5.4");
}
elsif ($address =~ /[\s]/) {
$self->syntax("EXPN");
}
else {
$self->send_("250-", "User foo <foo\@inetsim.org>", "2.0.0");
$self->send_(250, "User bar <bar\@inetsim.org>", "2.0.0");
}
}
sub ETRN {
my ($self, $args) = @_;
return if $self->helo_required;
return if $self->auth_required;
if (! defined $args || ! $args || $args =~ /^[\s\t]+\z/) {
$self->syntax("ETRN");
return;
}
if ($self->{transaction_type} eq "bdat") {
$self->send_(503, "Error: bad sequence of commands", "5.5.1");
return;
}
if ($args =~ /([^a-zA-Z0-9\-\.\s])/) {
$self->send_(501, "Error: invalid parameter syntax", "5.5.4");
}
else {
$self->send_(250, "Queuing started", "2.0.0");
}
}
sub get_credentials {
my ($self, $mech, $enc) = @_;
my ($user, $pass, $other) = "";
my $dec;
(defined $mech && $mech) or return 0;
(defined $enc && $enc) or return 0;
# decode base64
$enc =~ s/([^\x2B-\x7A])//g;
$enc =~ s/([\x2C-\x2E])//g;
$enc =~ s/([\x3A-\x3C])//g;
$enc =~ s/([\x3E-\x40])//g;
$enc =~ s/([\x5B-\x60])//g;
$dec = b64_dec($enc);
(defined $dec && $dec) or return 0;
$dec =~ s/[\r\n]*$//;
$dec =~ s/[\s\t]{2,}/\ /g;
$dec =~ s/^[\s\t]+//;
($dec) or return 0;
# ANONYMOUS: RFC 4505 [2245]
if ($mech eq "anonymous") {
$dec =~ s/[\s\t]+$//;
# check maximum length
(length($dec) <= 1024) or return 0;
# replace non-printable characters with "."
$dec =~ s/([^\x20-\x7e])/\./g;
$user = $dec;
$pass = "";
}
# PLAIN: RFC 4616 [2595]
elsif ($mech eq "plain") {
# check maximum length
(length($dec) <= 1024) or return 0;
($other, $user, $pass) = split(/\x00/, $dec, 3);
(defined $user && $user && defined $pass && $pass) or return 0;
$other = "" if (! defined $other);
$dec =~ s/[\x00]+/\ /g;
$dec =~ s/^\s+//g;
$other =~ s/^\s+//;
$user =~ s/^\s+//;
$user =~ s/\s+$//;
$pass =~ s/^\s+//;
# replace non-printable characters with "."
$dec =~ s/([^\x20-\x7e])/\./g;
$other =~ s/([^\x20-\x7e])/\./g;
$user =~ s/([^\x20-\x7e])/\./g;
$pass =~ s/([^\x20-\x7e])/\./g;
}
# LOGIN: http://tools.ietf.org/html/draft-murchison-sasl-login-00
# check the username for login mechanism
elsif ($mech eq "login_user") {
$dec =~ s/[\s\t]+$//;
# check maximum length
(length($dec) < 64) or return 0;
# replace non-printable characters with "."
$dec =~ s/([^\x20-\x7e])/\./g;
$user = $dec;
}
# check the password for login mechanism
elsif ($mech eq "login_pass") {
# check maximum length
(length($dec) <= 1024) or return 0;
# replace non-printable characters with "."
$dec =~ s/([^\x20-\x7e])/\./g;
$pass = $dec;
}
# CRAM-MD5/SHA1: RFC 2195
elsif ($mech eq "cram-md5" || $mech eq "cram-sha1") {
$dec =~ s/\s+$//;
# replace non-printable characters with "."
$dec =~ s/([^\x20-\x7e])/\./g;
($user, $pass) = split(/\s+/, $dec, 2);
(defined $user && $user && defined $pass && $pass) or return 0;
$user =~ s/\s+$//;
$pass =~ s/^\s+//;
$pass =~ s/\s+$//;
# check maximum length
(length($user) <= 1024) or return 0;
# check for valid md5
if ($mech eq "cram-md5" && $pass !~ /^[[:xdigit:]]{32}$/) {
return 0;
}
# check for valid sha1
if ($mech eq "cram-sha1" && $pass !~ /^[[:xdigit:]]{40}$/) {
return 0;
}
}
return ($dec, $user, $pass, $other);
}
sub AUTH {
my ($self, $args) = @_;
my $client = $self->{server}->{client};
my @methods = split(/[\s\t]+/, $SMTP_EXT{AUTH});
my ($encoded, $decoded);
my ($user, $pass, $other, $dummy);
return if $self->helo_required;
if ($self->{transaction_type} eq "bdat") {
$self->send_(503, "Error: bad sequence of commands", "5.5.1");
return;
}
if ($self->{auth_given}) {
$self->send_(503, "Already authenticated", "5.5.1");
return;
}
if ($self->{transaction}) {
$self->send_(503, "Authentication not allowed in transaction state", "5.5.1");
return;
}
if (! defined $args || $args eq "" || $args =~ /^[\s\t]+\z/) {
$self->syntax("AUTH");
return;
}
my ($mechanism, $string, $more) = split(/[\s\t]+/, $args, 3);
if (defined $more && $more && $more !~ /^[\s\t]+\z/) {
$self->syntax("AUTH");
return;
}
if (! defined $mechanism || ! $mechanism) {
$self->syntax("AUTH");
return;
}
if ($mechanism !~ /^(ANONYMOUS|PLAIN|LOGIN|CRAM-MD5|CRAM-SHA1)$/i) {
$self->send_(504, "Unknown authentication method", "5.7.4");
return;
}
$mechanism = lc($mechanism);
# test for allowed methods
my $found = 0;
foreach (@methods) {
if ($mechanism eq lc($_)) {
$found = 1;
last;
}
}
if (! $found) {
$self->send_(504, "Unknown authentication method", "5.7.4");
return;
}
### ANONYMOUS or PLAIN
if ($mechanism eq "anonymous" || $mechanism eq "plain") {
if (! defined ($string) || $string eq "") {
$self->send_(334, "Go on");
alarm($self->{timeout});
chomp($string = <$client>);
alarm($self->{timeout});
$string =~ s/\r$//g;
$string =~ s/[\r\n]+//g;
# replace non-printable characters with "."
$string =~ s/([^\x20-\x7e])/\./g;
$self->slog_("recv: $string");
}
if (! defined $string || $string eq "") {
$self->send_(535, "Incorrect authentication data", "5.7.8");
return;
}
if ($string =~ /^\*/) {
$self->send_(501, "Authentication cancelled", "5.7.0");
return;
}
($decoded, $user, $pass, $other) = $self->get_credentials($mechanism, $string);
if (! defined $decoded || ! $decoded) {
$self->send_(535, "Incorrect authentication data", "5.7.8");
return;
}
$self->slog_("info: $string --> $decoded");
if (! defined $user || $user eq "") {
$self->send_(535, "Incorrect authentication data", "5.7.8");
return;
}
}
### LOGIN
elsif ($mechanism eq "login") {
if (! defined ($string) || $string eq "") {
# ask for username
$self->send_(334, "VXNlcm5hbWU6");
$self->slog_("info: VXNlcm5hbWU6 --> Username:");
alarm($self->{timeout});
chomp($string = <$client>);
alarm($self->{timeout});
$string =~ s/\r$//g;
$string =~ s/[\r\n]+//g;
# replace non-printable characters with "."
$string =~ s/([^\x20-\x7e])/\./g;
$self->slog_("recv: $string");
}
if (! defined $string || $string eq "") {
$self->send_(535, "Incorrect authentication data", "5.7.8");
return;
}
if ($string =~ /^\*/) {
$self->send_(501, "Authentication cancelled", "5.7.0");
return;
}
($decoded, $user, $dummy, $other) = $self->get_credentials("login_user", $string);
if (! defined $decoded || ! $decoded) {
$self->send_(535, "Incorrect authentication data", "5.7.8");
return;
}
$self->slog_("info: $string --> $decoded");
# ask for password
$self->send_(334, "UGFzc3dvcmQ6");
$self->slog_("info: UGFzc3dvcmQ6 --> Password:");
alarm($self->{timeout});
chomp($string = <$client>);
alarm($self->{timeout});
$string =~ s/\r$//g;
$string =~ s/[\r\n]+//g;
# replace non-printable characters with "."
$string =~ s/([^\x20-\x7e])/\./g;
$self->slog_("recv: $string");
if (! defined $string || $string eq "") {
$self->send_(535, "Incorrect authentication data", "5.7.8");
return;
}
if ($string =~ /^\*/) {
$self->send_(501, "Authentication cancelled", "5.7.0");
return;
}
($decoded, $dummy, $pass, $other) = $self->get_credentials("login_pass", $string);
if (! defined $decoded || ! $decoded) {
$self->send_(535, "Incorrect authentication data", "5.7.8");
return;
}
$self->slog_("info: $string --> $decoded");
}
### CRAM-MD5 or CRAM-SHA1
elsif ($mechanism eq "cram-md5" || $mechanism eq "cram-sha1") {
if (defined $string && $string) {
$self->send_(501, "Error: invalid parameter syntax", "5.5.2");
return;
}
my $greeting = "<$$." . &INetSim::FakeTime::get_faketime() . '@' . "$self->{fqdn_hostname}>";
$encoded = encode_base64($greeting);
$encoded =~ s/[\r\n]+$//;
$self->send_(334, "$encoded");
$self->slog_("info: $encoded --> $greeting");
alarm($self->{timeout});
chomp($string = <$client>);
alarm($self->{timeout});
($decoded, $user, $pass, $other) = $self->get_credentials($mechanism, $string);
$string =~ s/\r$//g;
$string =~ s/[\r\n]+//g;
# replace non-printable characters with "."
$string =~ s/([^\x20-\x7e])/\./g;
$self->slog_("recv: $string");
if (! defined $string || $string eq "") {
$self->send_(535, "Incorrect authentication data", "5.7.8");
return;
}
if ($string =~ /^\*/) {
$self->send_(501, "Authentication cancelled", "5.7.0");
return;
}
if (! defined $decoded || ! $decoded) {
$self->send_(535, "Incorrect authentication data", "5.7.8");
return;
}
$self->slog_("info: $string --> $decoded");
}
else {
$self->send_(504, "Unknown authentication method", "5.7.4");
return;
}
### Authentication successful...
$status{auth_type} = "sasl/$mechanism";
$status{credentials} = "$user:$pass";
$self->{auth_given} = 1;
$self->send_(235, "Authentication successful", "2.7.0");
}
sub TURN {
my ($self, $command, $args) = @_;
my $line;
my ($banner, $ehlo, $helo, $mail, $rcpt, $data, $content, $quit) = 0;
return if $self->helo_required;
return if $self->auth_required;
if (defined $args && $args && $args !~ /^[\s\t]+\z/) {
$self->syntax($command);
return;
}
if ($self->{transaction_type} eq "bdat") {
$self->send_(503, "Error: bad sequence of commands", "5.5.1");
return;
}
if ($self->{transaction}) {
$self->send_(503, "Bad sequence of commands", "5.5.1");
return;
}
# additional tests for atrn
if ($self->{ESMTP} && ! $self->{auth_given} && $command eq "ATRN") {
$self->send_(530, "Authentication required", "5.5.1");
return;
}
$self->{close_connection} = 1;
$self->send_(250, "OK now reversing the connection", "2.0.0");
# set up local timeout handler
eval {
local $SIG{'ALRM'} = sub { die "TIMEOUT" };
alarm($self->{timeout});
$line = $self->recv_();
if ($line =~ /^220[\s]+/) {
# try ehlo first
$self->send_("000", "EHLO $self->{fqdn_hostname}");
alarm($self->{timeout});
$line = $self->recv_();
alarm($self->{timeout});
if ($line =~ /^250-/) {
$ehlo = 1;
while ($line =~ /^250-/) {
alarm($self->{timeout});
$line = $self->recv_();
alarm($self->{timeout});
last if ($line =~ /^250\s/);
}
}
elsif ($line =~ /^250\s/) {
$ehlo = 1;
}
elsif ($line =~ /^5\d\d\s/) {
# try helo
$self->send_("000", "HELO $self->{fqdn_hostname}");
alarm($self->{timeout});
$line = $self->recv_();
alarm($self->{timeout});
if ($line =~ /^250-/) {
$helo = 1;
while ($line =~ /^250-/) {
alarm($self->{timeout});
$line = $self->recv_();
alarm($self->{timeout});
last if ($line =~ /^250\s/);
}
}
elsif ($line =~ /^250\s/) {
$helo = 1;
}
else {
# wrong reply to helo
return;
}
}
else {
# wrong status codes -> close the connection
return;
}
# mail from
if ($ehlo || $helo) {
$self->send_("000", "MAIL FROM:<foo\@bar.org>");
alarm($self->{timeout});
$line = $self->recv_();
alarm($self->{timeout});
if ($line =~ /^25\d\s/) {
$mail = 1;
}
else {
return;
}
}
# rcpt to
if (($ehlo || $helo) && $mail) {
$self->send_("000", "RCPT TO:<bar\@foo.org>");
alarm($self->{timeout});
$line = $self->recv_();
alarm($self->{timeout});
if ($line =~ /^25\d\s/) {
$rcpt = 1;
}
else {
return;
}
}
# data
if (($ehlo || $helo) && $mail && $rcpt) {
$self->send_("000", "DATA");
alarm($self->{timeout});
$line = $self->recv_();
alarm($self->{timeout});
if ($line =~ /^354\s/) {
$data = 1;
}
else {
return;
}
}
# content
if (($ehlo || $helo) && $mail && $rcpt && $data) {
$self->send_("000", "Subject: INetSim test mail\r\n");
$self->send_("000", "This is an INetSim test mail...\r\n");
$self->send_("000", "\r\n.\r\n");
alarm($self->{timeout});
$line = $self->recv_();
alarm($self->{timeout});
if ($line =~ /^25\d\s/ || $line =~ /^(4|5)5\d\s/) {
$content = 1;
}
}
else {
return;
}
# quit
if (($ehlo || $helo) && $mail && $rcpt && $data && $content) {
$self->send_("000", "QUIT");
alarm($self->{timeout});
$line = $self->recv_();
alarm($self->{timeout});
if ($line =~ /^221\s/) { # for later use
$quit = 1;
}
}
}
alarm($self->{timeout});
};
alarm(0);
if ($@ =~ /TIMEOUT/) {
$self->{timed_out} = 1;
}
}
sub STARTTLS {
my ($self, $args) = @_;
# RFC 4954 says:
#
# -----------------------------------------------------------------
# "530 5.7.0 Authentication required
#
# This response SHOULD be returned by any command other than AUTH,
# EHLO, HELO, NOOP, RSET, or QUIT..."
# -----------------------------------------------------------------
#
# but this makes no sense for STARTTLS !!!?
#
#return if $self->auth_required;
if (defined $args && $args && $args !~ /^[\s\t]+\z/) {
$self->syntax("STARTTLS");
return;
}
if ($self->{using_tls}) {
$self->send_("454", "TLS not available due to temporary reason");
return;
}
$self->send_("220", "Ready to start TLS");
if ($self->upgrade_to_ssl()) {
# reset variables
$self->{helo_given} = 0;
$self->{sender_given} = 0;
$self->{recipient_given} = 0;
$self->{envelope_sender} = undef;
$self->{envelope_recipient} = undef;
$self->{transaction} = 0;
$self->{transaction_type} = "";
$self->{bdat_last} = 0;
$self->{bdat_content} = "";
$self->{bdat_incomplete} = 0;
$self->{body_mime} = "";
# deleting STARTTLS extension (rfc 2487, section 5.2)
delete $SMTP_EXT{STARTTLS};
# set tls flag
$self->{using_tls} = 1;
$status{tls_used} = 1;
# log success
$self->slog_("info: Connection successfully upgraded to SSL");
}
else {
$self->slog_("info: Upgrade to SSL failed: $self->{last_ssl_error}");
$self->{close_connection} = 1;
}
}
sub HELP {
my ($self, $command) = @_;
my $line = "";
my @verbs = qw/HELO MAIL RCPT DATA RSET NOOP QUIT/; # minimum requirement for smtp
# add optional smtp verbs
foreach my $key (sort keys %SMTP_EXT) {
if ($key =~ /^(HELP|VRFY|EXPN|SEND|SOML|SAML|TURN)$/i) {
push (@verbs, uc($key));
}
}
# add optional esmtp verbs
if ($self->{ESMTP}) {
# add the keyword ehlo
push (@verbs, "EHLO");
foreach my $key (sort keys %SMTP_EXT) {
if ($key =~ /^(ETRN|AUTH|ATRN)$/i) {
push (@verbs, uc($key));
}
}
# add BDAT, if chunking enabled
if (defined $SMTP_EXT{CHUNKING}) {
push (@verbs, "BDAT");
}
# add STARTTLS if enabled
if (defined $SMTP_EXT{STARTTLS}) {
push (@verbs, "STARTTLS");
}
}
# print topic help
if (defined ($command) && $command ne "" && $command =~ /^[A-Za-z0-9\-]{3,16}/) {
$command = uc($command);
foreach (@verbs) {
if ($_ eq $command) {
if ($command eq "HELO" || $command eq "EHLO") {
$self->send_("214-", "$command <hostname>");
$self->send_("214-", " This command is used to identify");
$self->send_("214", " the client to the server.");
return;
}
elsif ($command =~ /^(MAIL|SEND|SOML|SAML)$/) {
$self->send_("214-", "$command FROM: <address>");
$self->send_("214-", " This command is used to initiate");
$self->send_("214", " a mail transaction.");
return;
}
elsif ($command eq "RCPT") {
$self->send_("214-", "RCPT TO: <address>");
$self->send_("214-", " This command is used to identify");
$self->send_("214", " an individual recipient.");
return;
}
elsif ($command eq "DATA") {
$self->send_("214-", "DATA");
$self->send_("214-", " This command causes the mail data to");
$self->send_("214", " be appended to the mail data buffer.");
return;
}
elsif ($command eq "RSET") {
$self->send_("214-", "RSET");
$self->send_("214-", " This command specifies that the current");
$self->send_("214-", " mail transaction will be aborted. All");
$self->send_("214", " buffers and state tables are cleared.");
return;
}
elsif ($command eq "NOOP") {
$self->send_("214-", "NOOP");
$self->send_("214-", " This command has no effect, but it may");
$self->send_("214", " useful to prevent timeouts.");
return;
}
elsif ($command eq "HELP") {
$self->send_("214-", "HELP [<topic>]");
$self->send_("214-", " This command prints helpful information");
$self->send_("214", " about supported commands.");
return;
}
elsif ($command eq "QUIT") {
$self->send_("214-", "QUIT");
$self->send_("214-", " This command closes the");
$self->send_("214", " transmission channel.");
return;
}
elsif ($command eq "VRFY") {
$self->send_("214-", "VRFY <address>");
$self->send_("214-", " This command asks the receiver to");
$self->send_("214-", " confirm that the argument identifies");
$self->send_("214", " a user or mailbox.");
return;
}
elsif ($command eq "EXPN") {
$self->send_("214-", "EXPN <mailing list>");
$self->send_("214-", " This command asks the receiver to");
$self->send_("214-", " confirm that the argument identifies");
$self->send_("214", " a mailing list.");
return;
}
elsif ($command eq "TURN") {
$self->send_("214-", "TURN");
$self->send_("214-", " This command reverses");
$self->send_("214", " the connection.");
return;
}
elsif ($command eq "ETRN") {
$self->send_("214-", "ETRN [<option character>] <domain>]");
$self->send_("214-", " This command starts the remote queue");
$self->send_("214", " processing for the specified domain.");
return;
}
elsif ($command eq "AUTH") {
$self->send_("214-", "AUTH <mechanism> [<initial-response>]");
$self->send_("214-", " The command indicates an authentication");
$self->send_("214", " mechanism to the server.");
return;
}
elsif ($command eq "ATRN") {
$self->send_("214-", "ATRN <domain>");
$self->send_("214-", " This command reverses");
$self->send_("214", " the connection.");
return;
}
elsif ($command eq "BDAT") {
$self->send_("214-", "BDAT <chunk size> [LAST]");
$self->send_("214-", " This command causes the chunk to be");
$self->send_("214", " appended to the mail data buffer.");
return;
}
elsif ($command eq "STARTTLS") {
$self->send_("214-", "STARTTLS");
$self->send_("214-", " This command starts");
$self->send_("214", " the TLS negotiation.");
return;
}
}
}
# special topic not found, so jump to general help now :-)
}
# print general help
$self->send_("214-", "Commands supported:");
while () {
foreach (1..4) {
$line .= shift(@verbs) . " " if (@verbs);
}
if ($line) {
$line =~ s/[\s]+$//;
$self->send_("214-", " $line");
$line = "";
}
last if (! @verbs);
}
$self->send_("214", "For more info use \"HELP <topic>\".");
}
sub helo_required {
my $self = shift;
if ($self->{helo_required} && ! $self->{helo_given}) {
if ($self->{ESMTP}) {
$self->send_(503, "Error: send HELO/EHLO first", "5.5.2");
}
else {
$self->send_(503, "Error: send HELO first");
}
return 1;
}
return 0;
}
sub auth_required {
my $self = shift;
if ($self->{ESMTP} && $self->{auth_required} && ! $self->{auth_given}) {
$self->send_(530, "Authentication required", "5.7.0");
return 1;
}
return 0;
}
sub get_parameters { # only for MAIL/SEND/SOML/SAML/RCPT/VRFY/EXPN !!!
my ($self, $command, $string) = @_;
my @args = ();
my $address;
return undef if (! defined ($command) || $command eq "" || $command !~ /^(MAIL|SEND|SOML|SAML|RCPT|VRFY|EXPN)$/i);
$command = uc($command);
# clear old parameters
if ($command =~ /^(MAIL|SEND|SOML|SAML)$/) {
%MAIL_PARAM = ();
}
elsif ($command eq "RCPT") {
%RCPT_PARAM = ();
}
elsif ($command eq "VRFY") {
%VRFY_PARAM = ();
}
elsif ($command eq "EXPN") {
%EXPN_PARAM = ();
}
$self->{invalid_keyword} = 0;
if (defined ($string) && $string ne "") {
$string =~ s/[\s]+/\ /g;
$string =~ s/^[\s]+//;
$string =~ s/[\s]+$//;
@args = split (/[\s]+/, $string);
# return undef if empty (error)
return undef if (! @args);
# first argument should be the address
$address = shift (@args);
foreach (@args) {
s/^[\=]+//;
my ($key, $value);
# parameter=value (with one or more values)
if (/^[\x21-\x7E]+\=[\x21-\x7E]+$/) {
($key, $value) = split (/[\=]+/, $_, 2);
}
# parameter (without values)
elsif (/^([\x21-\x7E]+)$/) {
$key = $1;
$value = "";
}
# invalid -> ignore
else {
next;
}
if (defined ($key) && $key ne "") {
$key = uc($key);
if ($command =~ /^(MAIL|SEND|SOML|SAML)$/ && ! defined ($MAIL_PARAM{$key})) {
if ($self->{mail_keywords} !~ $key) {
$self->{invalid_keyword} = 1;
last;
}
$MAIL_PARAM{$key} = $value;
}
elsif ($command eq "RCPT" && ! defined ($RCPT_PARAM{$key})) {
if ($self->{rcpt_keywords} !~ $key) {
$self->{invalid_keyword} = 1;
last;
}
$RCPT_PARAM{$key} = $value;
}
elsif ($command eq "VRFY" && ! defined ($VRFY_PARAM{$key})) {
if ($self->{vrfy_keywords} !~ $key) {
$self->{invalid_keyword} = 1;
last;
}
$VRFY_PARAM{$key} = $value;
}
elsif ($command eq "EXPN" && ! defined ($EXPN_PARAM{$key})) {
if ($self->{expn_keywords} !~ $key) {
$self->{invalid_keyword} = 1;
last;
}
$EXPN_PARAM{$key} = $value;
}
}
}
}
# always give the first argument (address) back - or undef if error
return $address;
}
sub search_checkpoint {
my ($self, $transid, $sender) = @_;
my %checkpoint = ();
my $addr = "";
my $offset = 0;
my $messageid = "";
my $queueid = "";
my $dummy = "";
my $stat = "";
my $search = qr/\sSENDER\=$sender\,\sTRANSID\=$transid/;
$self->{checkpoint_found} = 0;
$self->{transaction_offset} = 0;
$self->{transaction_queueid} = "";
$self->{transaction_messageid} = "";
$self->{transaction_recipient} = "";
if (open(MBOX, "$self->{mboxFile}")) {
alarm($self->{timeout});
while (<MBOX>) {
$stat = "";
$dummy = "";
$queueid = "";
if (/^Delivered-To: (.*)$/) {
$addr = $1;
}
elsif (/^X-INetSim-Id: (.*)$/) {
$messageid = $1;
}
# search for checkpoints
elsif ($search && /^X-Checkpoint: (YES|NO)\, OFFSET\=([\d]+)\, QUEUEID\=(.*?)\, SENDER\=(.*?)\, TRANSID\=(.*)$/) {
$stat = $1;
# add checkpoint
if ($stat eq "YES") {
$checkpoint{$messageid} = "$2:$3:$addr:$4:$5";
}
# delete checkpoint
else {
$dummy = ":$3:$addr:$4:$5";
if (defined ($checkpoint{$messageid}) && $checkpoint{$messageid} =~ /^\d+$dummy$/) {
delete $checkpoint{$messageid};
}
}
}
}
close MBOX;
# if more than one checkpoint, search the last known offset
foreach $messageid (keys %checkpoint) {
($offset, $queueid, $addr, $dummy) = split (/:/, $checkpoint{$messageid}, 4);
if ($offset > $self->{transaction_offset}) {
$self->{checkpoint_found} = 1;
$self->{transaction_offset} = $offset;
$self->{transaction_queueid} = $queueid;
$self->{transaction_messageid} = $messageid;
$self->{transaction_recipient} = $addr;
}
}
}
}
sub write_message {
my ($self, $msg) = @_;
my $rhost = $self->{server}->{peeraddr};
my $line;
my $first = 1;
my $prev;
my $last;
my $header_field = 0;
my $is_body = 0;
my @raw = ();
my @header = ();
my @body = ();
my $size = 0;
my $offset = 0;
my $queueid;
my $message_id;
if (defined ($msg)) {
alarm($self->{timeout});
$size = length($msg);
$msg =~ s/\r\n/\n/g;
$msg =~ s/\r//g;
# my $oldfs = $/;
# $/ = undef;
@raw = split (/\n/, $msg);
# $/ = $oldfs;
# Removing empty lines at the beginning
while (defined ($raw[0]) && $raw[0] =~ /^$/) {
shift (@raw);
}
# Removing empty lines at the end
@raw = reverse (@raw);
while (defined ($raw[0]) && $raw[0] =~ /^$/) {
shift (@raw);
}
@raw = reverse (@raw);
foreach $line (@raw) {
# quote existing 'From ' lines
if ($line =~ /^From\s.*/) {
$line = ">" . $line;
}
# remove '.' from lines beginning with .
elsif ($line =~ /^\..+/) {
$line =~ s/^\.//;
}
# check for typical header syntax
if (! $is_body && $line =~ /^([a-zA-Z])([a-zA-Z0-9-_]+):\s([\x21-\x7E]+).*$/) {
$header_field = 1;
}
# header could be folded
elsif (! $is_body && $header_field && $line =~ /^[\s\t]+[\x21-\x7E]+.*$/) {
# do nothing
}
# may be end of header
elsif (! $is_body && $header_field && $line =~ /^$/) {
$is_body = 1;
$header_field = 0;
}
# check for anything after <CRLF> (but not in the first line), that should be the body
elsif (! $first && $prev =~ /^$/ && length($line)) {
$is_body = 1;
$header_field = 0;
}
# giving up... handle more data as body
else {
$is_body = 1;
$header_field = 0;
}
# push header line
if (! $is_body && $header_field && $line !~ /^$/) {
push (@header, $line);
}
# push body line
else {
push (@body, $line);
}
# delete the first-line-flag :-)
if ($first) { $first = 0; };
$prev = $line;
}
### Removing empty lines at the beginning
while (defined ($body[0]) && $body[0] =~ /^$/) {
shift (@body);
}
### generate queue and message id
if ($self->{transaction_type} eq "data" && $self->{checkpoint_found} && $self->{transaction_queueid}) {
$queueid = $self->{transaction_queueid};
$message_id = $self->{transaction_messageid};
$self->{envelope_recipient} = $self->{transaction_recipient};
}
else {
srand(time() ^($$ + ($$ <<15)));
$queueid = &dec2hex(int(rand(65534) + 1)) . &dec2hex(int(rand(65534) + 1 ));
my $sha = Digest::SHA->new();
$sha->add(int(rand(100000000)));
$sha->add(time());
$message_id = "<$queueid-" . $sha->hexdigest . "\@$self->{fqdn_hostname}>";
}
### some essential message headers
my @hdr = ();
push (@hdr, "From " . $self->{envelope_sender} . " " . scalar localtime(&INetSim::FakeTime::get_faketime()));
if ($self->{envelope_sender} eq "MAILER-DAEMON") {
push (@hdr, "Return-Path: <>");
}
else {
push (@hdr, "Return-Path: <" . $self->{envelope_sender} . ">");
}
push (@hdr, "Envelope-To: " . $self->{envelope_recipient});
# received line
push (@hdr, "Received: from victim ([$rhost])");
push (@hdr, "\tby cheater (INetSim) with $self->{mailTransmissionType} id $queueid");
push (@hdr, "\tfor <$self->{envelope_recipient}>; " . &rfc2822_date(&INetSim::FakeTime::get_faketime()));
# unique message-id
push (@hdr, "X-INetSim-Id: $message_id");
# write additional headers for CHUNKING
if ($self->{transaction_type} eq "bdat") {
if ($self->{bdat_incomplete}) {
push (@hdr, "X-Chunking: YES, INCOMPLETE");
}
else {
push (@hdr, "X-Chunking: YES, COMPLETE");
}
}
# write additional headers for CHECKPOINT/RESTART
if ($self->{transaction_type} eq "data") {
if ($self->{transid}) {
$offset = int($self->{transaction_offset} + $size);
if ($self->{data_incomplete}) {
push (@hdr, "X-Checkpoint: YES, OFFSET=$offset, QUEUEID=$queueid, SENDER=$self->{envelope_sender}, TRANSID=$self->{transid}");
}
else {
push (@hdr, "X-Checkpoint: NO, OFFSET=$offset, QUEUEID=$queueid, SENDER=$self->{envelope_sender}, TRANSID=$self->{transid}");
}
}
}
### Now write contents to mbox-file
if (! open(MBOX, ">>$self->{mboxFile}")) {
return undef;
}
foreach (@hdr) {
print MBOX "$_\n";
}
alarm($self->{timeout});
# message has a header, therefore add content
if (@header) {
foreach (@header) {
next if (/^$/);
print MBOX "$_\n";
}
}
# newline after header
print MBOX "\n";
alarm($self->{timeout});
# add message body, if not empty...
foreach (@body) {
print MBOX "$_\n";
}
alarm($self->{timeout});
# else add a second newline
print MBOX "\n";
# close mbox file
close MBOX;
# log the message id
$self->slog_("info: Message id: $message_id");
# return queue id
return $queueid;
}
return undef;
}
sub syntax {
my ($self, $command) = @_;
if (defined ($command) && $command) {
$command = uc($command);
if ($command =~ /^(HELO|EHLO)$/) {
$self->send_(501, "Syntax: $command hostname");
}
elsif ($command =~ /^(MAIL|SEND|SOML|SAML)$/) {
$self->send_(501, "Syntax: $command FROM:<address>", "5.5.4");
}
elsif ($command eq "RCPT") {
$self->send_(501, "Syntax: RCPT TO:<address>", "5.5.4");
}
elsif ($command =~ /^(RSET|DATA|NOOP|QUIT|TURN|STARTTLS)$/) {
$self->send_(501, "Syntax: $command", "5.5.4");
}
elsif ($command eq "VRFY") {
$self->send_(501, "Syntax: VRFY <address>", "5.5.4");
}
elsif ($command eq "EXPN") {
$self->send_(501, "Syntax: EXPN <mailing list>", "5.5.4");
}
elsif ($command eq "ETRN") {
$self->send_(501, "Syntax: ETRN [<option character>] <domain>", "5.5.4");
}
elsif ($command eq "AUTH") {
$self->send_(501, "Syntax: AUTH <mechanism> [<initial-response>]", "5.5.4");
}
elsif ($command eq "ATRN") {
$self->send_(501, "Syntax: ATRN <domain>", "5.5.4");
}
elsif ($command eq "BDAT") {
$self->send_(501, "Syntax: BDAT <chunk size> [LAST]", "5.5.4");
}
}
}
sub dec2hex {
my $str = uc(sprintf("%lx", shift));
my $padding = 0;
$padding = 2 - length($str) % 2 if length($str) % 2;
return substr('00', 0, $padding) . $str;
}
sub b64_dec {
my $string = shift;
my $length;
my $out;
(defined $string && $string) or return 0;
(length($string) % 4 == 0) or return 0;
($string =~ /^[A-Za-z0-9\+\/]+([\=]{0,2})$/) or return 0;
return decode_base64($string);
}
sub rfc2822_date {
my $timestamp = shift;
my @days=qw/Sun Mon Tue Wed Thu Fri Sat/;
my @months=qw/Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec/;
if (defined ($timestamp) && $timestamp) {
my ($sec,$min,$hour,$mday,$mon,$year,$wday,$yday) = gmtime($timestamp);
$year += 1900;
$hour = substr("0$hour", -2);
$min = substr("0$min", -2);
$sec = substr("0$sec", -2);
return "$days[$wday], $mday $months[$mon] $year $hour:$min:$sec -0000"; # always utc !!
}
return 0;
}
sub register_extensions {
my $self = shift;
my %conf_ext;
if ($self->{ssl_enabled}) {
%conf_ext = &INetSim::Config::getConfigHash("SMTPS_Service_Extensions");
}
else {
%conf_ext = &INetSim::Config::getConfigHash("SMTP_Service_Extensions");
}
$self->{mail_keywords} = "";
$self->{rcpt_keywords} = "";
$self->{vrfy_keywords} = "";
$self->{expn_keywords} = "";
foreach (keys %conf_ext) {
if (defined ($EXT_AVAIL{$_}) && $EXT_AVAIL{$_}) {
if (! defined ($SMTP_EXT{$_})) {
# for compatibility with old option 'smtp_auth_reversibleonly'
if ($_ eq "AUTH" && $self->{auth_reversible_only}) {
$conf_ext{$_} =~ s/CRAM-(MD5|SHA1)([\s]+)?//g;
# do not register without any mechanism
next if ($conf_ext{$_} !~ /[A-Za-z0-9]+/);
}
$conf_ext{$_} =~ s/[\s]+$//;
# parameters are allowed
if ($EXT_AVAIL{$_} == 2) {
$SMTP_EXT{$_} = $conf_ext{$_};
}
# parameters are not allowed
else {
$SMTP_EXT{$_} = "";
}
# register keywords for mail
if (defined($MAIL_AVAIL{$_})) {
$self->{mail_keywords} .= join (",", $MAIL_AVAIL{$_}) . ",";
}
# register keywords for rcpt
if (defined($RCPT_AVAIL{$_})) {
$self->{rcpt_keywords} .= join (",", $RCPT_AVAIL{$_}) . ",";
}
# register keywords for vrfy
if (defined($VRFY_AVAIL{$_})) {
$self->{vrfy_keywords} .= join (",", $VRFY_AVAIL{$_}) . ",";
}
# register keywords for expn
if (defined($EXPN_AVAIL{$_})) {
$self->{expn_keywords} .= join (",", $EXPN_AVAIL{$_}) . ",";
}
}
}
}
$self->{mail_keywords} =~ s/\,$//;
$self->{rcpt_keywords} =~ s/\,$//;
$self->{vrfy_keywords} =~ s/\,$//;
$self->{expn_keywords} =~ s/\,$//;
# resolve possible dependencies below...
# disable ATRN, if AUTH is not set
if (defined $SMTP_EXT{ATRN} && ! defined $SMTP_EXT{AUTH}) {
delete $SMTP_EXT{ATRN};
}
# don't force authentication without AUTH extension ;-)
if (! defined $SMTP_EXT{AUTH}) {
$self->{auth_required} = 0;
}
# disable BINARYMIME, if CHUNKING is not set
if (defined ($SMTP_EXT{BINARYMIME}) && ! defined ($SMTP_EXT{CHUNKING})) {
delete $SMTP_EXT{BINARYMIME};
}
# # according to RFC 2821, section '4.5.1 Minimum Implementation': "...MUST be supported...VRFY..."
# if ($self->{ESMTP} && ! defined ($SMTP_EXT{VRFY})) {
# $SMTP_EXT{VRFY} = "";
# }
# if SIZE is set with value, then set maximum message size (must be >= 1MB)
if (defined ($SMTP_EXT{SIZE}) && $SMTP_EXT{SIZE} && $SMTP_EXT{SIZE} =~ /^([\d]{7,})$/) {
$self->{max_message_size} = $1;
}
else {
# set default maximum size to 10 MB
$self->{max_message_size} = 10485760;
}
# set maximum chunk length for chunking to 25% from max_message_size
$self->{max_chunk_length} = int($self->{max_message_size} / 4);
# check FUTURERELEASE options (required !)
if (defined ($SMTP_EXT{FUTURERELEASE}) && (! $SMTP_EXT{FUTURERELEASE} || $SMTP_EXT{FUTURERELEASE} !~ /^([\d]+)\s([\d]+)$/)) {
# set 'max-future-release-interval' to two weeks and 'max-future-release-date-time' to faketime_max
my $max_date = &INetSim::Config::getConfigParameter("Faketime_Max");
$max_date = 999999999 if (! $max_date || $max_date > 999999999); # check maximum allowed value
$SMTP_EXT{FUTURERELEASE} = "1209600 $max_date";
}
# disable STARTTLS, if SSL library not found or certfile/keyfile not found/not readable/empty
if (! $SSL || ! -f $self->{ssl_key} || ! -r $self->{ssl_key} || ! -f $self->{ssl_crt} || ! -r $self->{ssl_crt} || ! -s $self->{ssl_key} || ! -s $self->{ssl_crt}) {
delete $SMTP_EXT{STARTTLS};
}
# warn about missing dh file and disable
if (defined $self->{ssl_dh} && (! -f $self->{ssl_dh} || ! -r $self->{ssl_dh} || ! -s $self->{ssl_dh})) {
&INetSim::Log::MainLog("Warning: Unable to read Diffie-Hellman parameter file '$self->{ssl_dh}'", $self->{servicename});
$self->{ssl_dh} = undef;
}
# disable STARTTLS, if already using SSL
if ($self->{ssl_enabled}) {
delete $SMTP_EXT{STARTTLS};
}
# set mail transmission type
$self->{mailTransmissionType} = "SMTP";
if ($self->{ESMTP}) {
if (defined $SMTP_EXT{STARTTLS}) {
$self->{mailTransmissionType} .= "S";
}
if (defined $SMTP_EXT{AUTH} && $SMTP_EXT{AUTH} ne "") {
$self->{mailTransmissionType} .= "A";
}
if (defined $SMTP_EXT{UTF8SMTP}) {
$self->{mailTransmissionType} = "UTF8" . $self->{mailTransmissionType};
}
else {
$self->{mailTransmissionType} = "E" . $self->{mailTransmissionType};
}
}
}
sub upgrade_to_ssl {
my $self = shift;
my %ssl_params = ( SSL_version => "SSLv23",
SSL_cipher_list => "ALL",
SSL_server => 1,
SSL_use_cert => 1,
SSL_key_file => $self->{ssl_key},
SSL_cert_file => $self->{ssl_crt} );
$self->{last_ssl_error} = "";
if (defined $self->{ssl_dh} && $self->{ssl_dh}) {
$ssl_params{'SSL_dh_file'} = $self->{ssl_dh};
}
my $result = IO::Socket::SSL::socket_to_SSL( $self->{server}->{client}, %ssl_params );
if (defined $result) {
$status{tls_cipher} = lc($result->get_cipher());
return 1;
}
else {
$self->{last_ssl_error} = IO::Socket::SSL::errstr();
return 0;
}
}
sub error_exit {
my ($self, $msg) = @_;
my $rhost = $self->{server}->{peeraddr};
my $rport = $self->{server}->{peerport};
if (! defined $msg) {
$msg = "Unknown error";
}
&INetSim::Log::MainLog("$msg. Closing connection.", $self->{servicename});
&INetSim::Log::SubLog("[$rhost:$rport] error: $msg. Closing connection.", $self->{servicename}, $$);
&INetSim::Log::SubLog("[$rhost:$rport] disconnect", $self->{servicename}, $$);
exit 1;
}
1;
#############################################################
#
# History:
#
# Version 0.90 (2014-05-23) th
# - changed SSL_version to "SSLv23"
#
# Version 0.89 (2010-04-12) me
# - do not filter non-printable characters because it's already
# implemented in the log module
#
# Version 0.88 (2009-12-19) me
# - added new configuration variable 'CertDir'
#
# Version 0.87 (2009-12-17) me
# - added STARTTLS to HELP topic
#
# Version 0.86 (2009-10-27) me
# - bugfix: added AUTH as keyword to the MAIL command
# - added STARTTLS in mail transmission type
#
# Version 0.85 (2009-10-09) me
# - added generic decoder/parser function get_credentials() and
# fixed some bugs in the authentication part - i believe, it
# should be bullet-proof now :-)
#
# Version 0.84 (2009-10-07) me
# - fixed a bug with spaces in user/pw combo in function AUTH()
# - changed some code parts
#
# Version 0.83 (2009-10-06) me
# - added new optional config parameter 'SMTP[S]_DHFileName'
# - changed function upgrade_to_ssl() to work with Diffie-Hellman
# parameters and added 'ALL' available ciphers to the SSL
# options (except 'eNULL')
# - added information about TLS and SSL cipher to the status line
# - added new optional config parameter 'SMTP[S]_AuthRequired'
# - added support for required (forced) authentication
#
# Version 0.82 (2009-09-25) me
# - added check for SSL library and cert files
#
# Version 0.81 (2009-09-07) me
# - fixed: SMTP extensions should not end with space character
# in EHLO reply
#
# Version 0.80 (2009-09-04) me
# - small fixes with variables
# - added SSL protocol version 2
#
# Version 0.79 (2009-09-03) me
# - added support for SSL (smtps)
# - added check for empty certs
# - added generic function upgrade_to_ssl()
#
# Version 0.78 (2009-09-02) me
# - added support for STARTTLS (RFC 3207 [2487])
#
# Version 0.77 (2009-09-01) me
# - fixed 'Return-Path' for mails from '<>'
#
# Version 0.76 (2009-08-27) me
# - replaced 'Delivered-To' with 'Envelope-To'
#
# Version 0.75 (2008-10-02) me
# - bugfix: don't touch variable 'helo_given' on RSET command
#
# Version 0.74 (2008-09-26) me
# - disabled force of VRFY extension in ESMTP mode (Note: this
# violates the specification in RFC 2821, section '4.5.1')
# - changed error response for (disabled) VRFY command to code 502
# (not implemented) instead of 500 (unknown command) - ESMTP only!
#
# Version 0.73 (2008-09-25) me
# - added generic function 'get_parameters()'
# - added checks for allowed parameter keywords
# - added handling of 'mail' parameter SIZE
# - changed handling of 'mail' parameter BODY
# - added check for required FUTURERELEASE options
# - added support for CHECKPOINT (RFC 1845)
# - fixed handling for helo/ehlo
# - added function helo_required()
# - fixed a small typo in function register_extensions()
#
# Version 0.72 (2008-09-23) me
# - added generic function 'write_message()'
# - improved and cleaned up the DATA function
# - moved VRFY declaration to function register_extensions(),
# because it is only needed for ESMTP
# - added variable 'max_message_size' for size limits, so we can
# discard more data (default just set to 10mb)
# - added support for CHUNKING and BINARYMIME (RFC 3030),
# therefore added new command/function BDAT
# - added 'Mail Transmission Type' for replacing the keyword
# 'xSMTPx' in the banner string and for the received header
#
# Version 0.71 (2008-09-22) me
# - added generic function 'recv_()'
# - added support for TURN (RFC 821) and ATRN (RFC 2645)
# - improved function HELP(), now only prints enabled commands
# - improved dependencies for some SMTP commands when ESMTP is
# turned off but their extension is enabled (SEND, SOML, SAML,
# HELP, VRFY, EXPN, TURN)
#
# Version 0.70 (2008-09-21) me
# - added new configuration variable 'SMTP_Extended_SMTP' for
# switching between SMTP and ESMTP
# - changed some if-statements, so only works with ESMTP and if
# configured
# - added new function 'register_extensions()' (see below)
# - added new configuration hash 'SMTP_Service_Extensions', so
# every extension can now be configured
# - added support for authentication mechanism CRAM-SHA1
# - added support for commands SEND, SOML and SAML
# - added support for SMTP extensions MTRK (RFC 3885),
# DELIVERBY (RFC 2852), SUBMITTER (RFC 4405), NO-SOLICITING
# (RFC 3865) and FUTURERELEASE (RFC 4865)
# - changed some functions to work correctly in SMTP or ESMTP mode
# - removed useless configuration variable 'SMTP_EnhancedStatusCodes'
# - added check for allowed (configured) authentication mechanisms
# in function 'AUTH()'
# - changed 'Received:' line to write now SMTP or ESMTP
#
# Version 0.69 (2008-09-20) me
# - added generic functions 'send_()' and 'slog_()' for sending
# data to the client and logging
# - added authentication support for ANONYMOUS mechanism (RFC 2245)
# - added new header field with message id to messages ('X-INetSim-Id')
# - added support for SMTP extension 'Enhanced Error Codes', defined
# in RFC 2034 and 3463
# - substituted use of error_exit() in function 'DATA()' with an
# regular SMTP error response
# - substituted message for maximum connections with an regular SMTP
# error response
# - added syntax checks for most commands in function 'syntax()'
# - code cleanup
#
# Version 0.68 (2008-09-19) me
# - complete rewrite (oo-style)
# - changed regular expression for commands
# - changed handling of AUTH while transaction state
# - enhanced support for HELP
# - fixed option parsing for ETRN
# - removing '.' at the beginning of lines in a mail body (according
# to RFC 821/2821, section 'TRANSPARENCY')
#
# Version 0.67 (2008-08-27) me
# - added logging of process id
#
# Version 0.66 (2008-08-21) me
# - added byte counter for received data
#
# Version 0.65 (2008-08-06) me
# - changed HELO reply
#
# Version 0.64 (2008-08-02) th
# - fixed typo in SMTP mbox file write test error message
#
# Version 0.63 (2008-06-26) me
# - fixed problem with uninitialized variables
#
# Version 0.62 (2008-06-15) me
# - changed logging of received messages
# - improved handling of messages without body
# - added quoting of lines beginning with 'From '
#
# Version 0.61 (2008-06-15) me
# - bugfix: endless loop caused by an empty message
#
# Version 0.60 (2008-06-08) me
# - changed queue id mechanism for a bit more randomness
#
# Version 0.59 (2008-05-28) me
# - changed mbox format - 'Received:' line added
#
# Version 0.58 (2008-03-25) me
# - changed timeout handling a bit
#
# Version 0.57 (2008-03-19) me
# - added timeout after inactivity of n seconds, using new
# config parameter Default_TimeOut
#
# Version 0.56 (2007-12-31) th
# - change process name
#
# Version 0.55 (2007-12-09) me
# - changed authentication mechanism support for use with new
# ConfigParameter "SMTP_AuthReversibleOnly"
#
# Version 0.54 (2007-12-07) me
# - added syntax checks for ETRN
# - added syntax checks for EXPN
# - added syntax checks for VRFY
#
# Version 0.53 (2007-11-07) me
# - added pseudo-support for DSN (RFC 3461)
# - added pseudo-support for VERP (Variable Envelope Return Path)
# - added support for ETRN (RFC 1985)
# - added support for HELP
# - added support for EXPN
# - removed ENHANCEDSTATUSCODES (RFC 2034) from listed extensions
# - added VRFY and EXPN to listed extensions
#
# Version 0.52 (2007-09-16) me
# - added details about authentication to the status line
# - added regex for removing spaces in authentication strings
#
# Version 0.51 (2007-09-15) me
# - fixed a typo with decoded base64 strings
#
# Version 0.50 (2007-09-15) me
# - added checks for valid base64 data (not implemented in MIME::Base64)
# - added authentication mechanism CRAM-MD5
#
# Version 0.49 (2007-09-14) me
# - added authentication support (RFC 2554) for PLAIN and LOGIN
# mechanism (very poor, so it needs work !)
#
# Version 0.48 (2007-09-03) me
# - creating smtp.mbox if it doesn't exist
#
# Version 0.47 (2007-05-08) th
# - replace non-printable characters with "." while processing commands
#
# Version 0.46 (2007-04-26) th
# - use getConfigParameter
#
# Version 0.45 (2007-04-24) th
# - added function error_exit()
# - replaced die() calls with error_exit()
#
# Version 0.44 (2007-04-21) me
# - added logging of status for use with &INetSim::Report::GenReport()
#
# Version 0.43 (2007-04-20) me
# - substituted return with last in "QUIT" loop
#
# Version 0.42 (2007-04-10) th
# - get fake time via &INetSim::FakeTime::get_faketime()
# instead of accessing $INetSim::Config::FakeTimeDelta
#
# Version 0.41 (2007-04-05) th
# - changed check for MaxChilds, BindAddress, RunAsUser and
# RunAsGroup
#
# Version 0.4 (2007-03-26) th
# - rewrote module to use INetSim::GenericServer
# - added syntax checks for VRFY and QUIT
# - added configuration option $INetSim::Config::SMTP_HELO_required
# - added logging of refused connections
# - added configuration option $INetSim::Config::SMTP_MBOXFileName
#
# Version 0.33 (2007-03-21) th
# - fixed bug if mailbody only contains single line of data
#
# Version 0.32 (2007-03-20) th
# - fixed typo with $INetSim::Config::FakeTimeDelta
#
# Version 0.31 (2007-03-18) th
# - bug fix with variable
# - added configuration options
# $INetSim::Config::SMTP_FQDN_Hostname and $INetSim::Config::SMTP_Banner
#
# Version 0.3 (2007-03-15) me
# - added a fix for dynamic queue-ids (poor !)
# - fix: now sends an error, if rcpt before mail is given
#
# Version 0.2 (2007-03-11) me
# - now we can write a mbox-file :-)
#
#############################################################
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