682 lines
20 KiB
Perl
682 lines
20 KiB
Perl
package Qpsmtpd::SMTP;
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use Qpsmtpd;
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@ISA = qw(Qpsmtpd);
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package Qpsmtpd::SMTP;
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use strict;
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use Carp;
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use Qpsmtpd::Connection;
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use Qpsmtpd::Transaction;
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use Qpsmtpd::Plugin;
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use Qpsmtpd::Constants;
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use Qpsmtpd::Auth;
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use Qpsmtpd::Address ();
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use Qpsmtpd::Command;
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use Mail::Header ();
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#use Data::Dumper;
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use POSIX qw(strftime);
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use Net::DNS;
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# this is only good for forkserver
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# can't set these here, cause forkserver resets them
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#$SIG{ALRM} = sub { respond(421, "Game over pal, game over. You got a timeout; I just can't wait that long..."); exit };
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#$SIG{ALRM} = sub { warn "Connection Timed Out\n"; exit; };
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sub new {
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my $proto = shift;
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my $class = ref($proto) || $proto;
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my %args = @_;
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my $self = bless ({ args => \%args }, $class);
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my (@commands) = qw(ehlo helo rset mail rcpt data help vrfy noop quit);
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my (%commands); @commands{@commands} = ('') x @commands;
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# this list of valid commands should probably be a method or a set of methods
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$self->{_commands} = \%commands;
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$self;
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}
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sub command_counter {
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my $self = shift;
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$self->{_counter} || 0;
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}
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sub dispatch {
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my $self = shift;
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my ($cmd) = lc shift;
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$self->{_counter}++;
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if ($cmd !~ /^(\w{1,12})$/ or !exists $self->{_commands}->{$1}) {
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my ($rc, @msg) = $self->run_hooks("unrecognized_command", $cmd, @_);
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@msg = map { split /\n/ } @msg;
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if ($rc == DENY_DISCONNECT) {
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$self->respond(521, @msg);
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$self->disconnect;
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}
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elsif ($rc == DENY) {
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$self->respond(500, @msg);
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}
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elsif ($rc == DONE) {
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1;
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}
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else {
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$self->respond(500, "Unrecognized command");
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}
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return 1
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}
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$cmd = $1;
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if (1 or $self->{_commands}->{$cmd} and $self->can($cmd)) {
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my ($result) = eval { $self->$cmd(@_) };
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$self->log(LOGERROR, "XX: $@") if $@;
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return $result if defined $result;
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return $self->fault("command '$cmd' failed unexpectedly");
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}
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return;
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}
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sub fault {
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my $self = shift;
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my ($msg) = shift || "program fault - command not performed";
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print STDERR "$0[$$]: $msg ($!)\n";
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return $self->respond(451, "Internal error - try again later - " . $msg);
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}
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sub start_conversation {
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my $self = shift;
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# this should maybe be called something else than "connect", see
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# lib/Qpsmtpd/TcpServer.pm for more confusion.
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my ($rc, @msg) = $self->run_hooks("connect");
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if ($rc == DENY) {
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$msg[0] ||= 'Connection from you denied, bye bye.';
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$self->respond(550, @msg);
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return $rc;
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}
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elsif ($rc == DENYSOFT) {
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$msg[0] ||= 'Connection from you temporarily denied, bye bye.';
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$self->respond(450, @msg);
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return $rc;
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}
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elsif ($rc == DONE) {
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return $rc;
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}
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elsif ($rc != DONE) {
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my $greets = $self->config('smtpgreeting');
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if ( $greets ) {
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$greets .= " ESMTP";
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}
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else {
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$greets = $self->config('me')
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. " ESMTP qpsmtpd "
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. $self->version
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. " ready; send us your mail, but not your spam.";
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}
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$self->respond(220, $greets);
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return DONE;
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}
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}
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sub transaction {
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my $self = shift;
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return $self->{_transaction} || $self->reset_transaction();
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}
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sub reset_transaction {
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my $self = shift;
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$self->run_hooks("reset_transaction") if $self->{_transaction};
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return $self->{_transaction} = Qpsmtpd::Transaction->new();
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}
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sub connection {
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my $self = shift;
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@_ and $self->{_connection} = shift;
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return $self->{_connection} || ($self->{_connection} = Qpsmtpd::Connection->new());
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}
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sub helo {
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my ($self, $line) = @_;
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my ($rc, @msg) = $self->run_hooks('helo_parse');
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my ($ok, $hello_host, @stuff) = Qpsmtpd::Command->parse('helo', $line, $msg[0]);
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return $self->respond (501,
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"helo requires domain/address - see RFC-2821 4.1.1.1") unless $hello_host;
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my $conn = $self->connection;
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return $self->respond (503, "but you already said HELO ...") if $conn->hello;
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($rc, @msg) = $self->run_hooks("helo", $hello_host, @stuff);
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if ($rc == DONE) {
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# do nothing
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} elsif ($rc == DENY) {
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$self->respond(550, @msg);
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} elsif ($rc == DENYSOFT) {
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$self->respond(450, @msg);
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} elsif ($rc == DENY_DISCONNECT) {
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$self->respond(550, @msg);
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$self->disconnect;
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} elsif ($rc == DENYSOFT_DISCONNECT) {
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$self->respond(450, @msg);
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$self->disconnect;
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} else {
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$conn->hello("helo");
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$conn->hello_host($hello_host);
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$self->transaction;
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$self->respond(250, $self->config('me') ." Hi " . $conn->remote_info . " [" . $conn->remote_ip ."]; I am so happy to meet you.");
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}
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}
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sub ehlo {
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my ($self, $line) = @_;
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my ($rc, @msg) = $self->run_hooks('ehlo_parse');
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my ($ok, $hello_host, @stuff) = Qpsmtpd::Command->parse('ehlo', $line, $msg[0]);
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return $self->respond (501,
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"ehlo requires domain/address - see RFC-2821 4.1.1.1") unless $hello_host;
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my $conn = $self->connection;
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return $self->respond (503, "but you already said HELO ...") if $conn->hello;
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($rc, @msg) = $self->run_hooks("ehlo", $hello_host, @stuff);
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if ($rc == DONE) {
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# do nothing
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} elsif ($rc == DENY) {
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$self->respond(550, @msg);
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} elsif ($rc == DENYSOFT) {
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$self->respond(450, @msg);
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} elsif ($rc == DENY_DISCONNECT) {
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$self->respond(550, @msg);
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$self->disconnect;
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} elsif ($rc == DENYSOFT_DISCONNECT) {
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$self->respond(450, @msg);
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$self->disconnect;
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} else {
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$conn->hello("ehlo");
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$conn->hello_host($hello_host);
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$self->transaction;
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my @capabilities = $self->transaction->notes('capabilities')
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? @{ $self->transaction->notes('capabilities') }
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: ();
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# Check for possible AUTH mechanisms
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my %auth_mechanisms;
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HOOK: foreach my $hook ( keys %{$self->{hooks}} ) {
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if ( $hook =~ m/^auth-?(.+)?$/ ) {
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if ( defined $1 ) {
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$auth_mechanisms{uc($1)} = 1;
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}
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else { # at least one polymorphous auth provider
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%auth_mechanisms = map {$_,1} qw(PLAIN CRAM-MD5 LOGIN);
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last HOOK;
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}
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}
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}
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# Check if we should only offer AUTH after TLS is completed
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my $tls_before_auth = ($self->config('tls_before_auth') ? ($self->config('tls_before_auth'))[0] && $self->transaction->notes('tls_enabled') : 0);
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if ( %auth_mechanisms && !$tls_before_auth) {
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push @capabilities, 'AUTH '.join(" ",keys(%auth_mechanisms));
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$self->{_commands}->{'auth'} = "";
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}
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$self->respond(250,
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$self->config("me") . " Hi " . $conn->remote_info . " [" . $conn->remote_ip ."]",
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"PIPELINING",
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"8BITMIME",
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($self->config('databytes') ? "SIZE ". ($self->config('databytes'))[0] : ()),
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@capabilities,
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);
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}
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}
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sub auth {
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my ($self, $line) = @_;
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my ($rc, $sub) = $self->run_hooks('auth_parse');
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my ($ok, $arg, @stuff) = Qpsmtpd::Command->parse('auth', $line, $sub);
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return $self->respond(501, $arg || "Syntax error in command")
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unless ($ok == OK);
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#they AUTH'd once already
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return $self->respond( 503, "but you already said AUTH ..." )
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if ( defined $self->{_auth}
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and $self->{_auth} == OK );
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return $self->respond( 503, "AUTH not defined for HELO" )
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if ( $self->connection->hello eq "helo" );
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return $self->respond( 503, "SSL/TLS required before AUTH" )
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if ( ($self->config('tls_before_auth'))[0]
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and $self->transaction->notes('tls_enabled') );
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return $self->{_auth} = Qpsmtpd::Auth::SASL( $self, $arg, @stuff );
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}
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sub mail {
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my ($self, $line) = @_;
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# -> from RFC2821
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# The MAIL command (or the obsolete SEND, SOML, or SAML commands)
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# begins a mail transaction. Once started, a mail transaction
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# consists of a transaction beginning command, one or more RCPT
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# commands, and a DATA command, in that order. A mail transaction
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# may be aborted by the RSET (or a new EHLO) command. There may be
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# zero or more transactions in a session. MAIL (or SEND, SOML, or
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# SAML) MUST NOT be sent if a mail transaction is already open,
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# i.e., it should be sent only if no mail transaction had been
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# started in the session, or it the previous one successfully
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# concluded with a successful DATA command, or if the previous one
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# was aborted with a RSET.
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# sendmail (8.11) rejects a second MAIL command.
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# qmail-smtpd (1.03) accepts it and just starts a new transaction.
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# Since we are a qmail-smtpd thing we will do the same.
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$self->reset_transaction;
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unless ($self->connection->hello) {
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return $self->respond(503, "please say hello first ...");
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}
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else {
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$self->log(LOGINFO, "full from_parameter: $line");
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my ($rc, @msg) = $self->run_hooks("mail_parse");
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my ($ok, $from, @params) = Qpsmtpd::Command->parse('mail', $line, $msg[0]);
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return $self->respond(501, $from || "Syntax error in command")
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unless ($ok == OK);
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my %param;
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foreach (@params) {
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my ($k,$v) = split /=/, $_, 2;
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$param{lc $k} = $v;
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}
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# to support addresses without <> we now require a plugin
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# hooking "mail_pre" to
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# return (OK, "<$from>");
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# (...or anything else parseable by Qpsmtpd::Address ;-))
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# see also comment in sub rcpt()
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($rc, @msg) = $self->run_hooks("mail_pre", $from);
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if ($rc == OK) {
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$from = shift @msg;
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}
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$self->log(LOGALERT, "from email address : [$from]");
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return $self->respond(501, "could not parse your mail from command")
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unless $from =~ /^<.*>$/;
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if ($from eq "<>" or $from =~ m/\[undefined\]/ or $from eq "<#@[]>") {
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$from = Qpsmtpd::Address->new("<>");
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}
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else {
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$from = (Qpsmtpd::Address->parse($from))[0];
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}
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return $self->respond(501, "could not parse your mail from command") unless $from;
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($rc, @msg) = $self->run_hooks("mail", $from, %param);
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if ($rc == DONE) {
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return 1;
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}
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elsif ($rc == DENY) {
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$msg[0] ||= $from->format . ', denied';
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$self->log(LOGINFO, "deny mail from " . $from->format . " (@msg)");
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$self->respond(550, @msg);
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}
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elsif ($rc == DENYSOFT) {
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$msg[0] ||= $from->format . ', temporarily denied';
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$self->log(LOGINFO, "denysoft mail from " . $from->format . " (@msg)");
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$self->respond(450, @msg);
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}
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elsif ($rc == DENY_DISCONNECT) {
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$msg[0] ||= $from->format . ', denied';
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$self->log(LOGINFO, "deny mail from " . $from->format . " (@msg)");
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$self->respond(550, @msg);
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$self->disconnect;
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}
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elsif ($rc == DENYSOFT_DISCONNECT) {
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$msg[0] ||= $from->format . ', temporarily denied';
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$self->log(LOGINFO, "denysoft mail from " . $from->format . " (@msg)");
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$self->respond(421, @msg);
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$self->disconnect;
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}
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else { # includes OK
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$self->log(LOGINFO, "getting mail from ".$from->format);
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$self->respond(250, $from->format . ", sender OK - how exciting to get mail from you!");
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$self->transaction->sender($from);
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}
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}
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}
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sub rcpt {
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my ($self, $line) = @_;
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my ($rc, @msg) = $self->run_hooks("rcpt_parse");
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my ($ok, $rcpt, @param) = Qpsmtpd::Command->parse("rcpt", $line, $msg[0]);
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return $self->respond(501, $rcpt || "Syntax error in command")
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unless ($ok == OK);
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return $self->respond(503, "Use MAIL before RCPT") unless $self->transaction->sender;
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my %param;
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foreach (@param) {
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my ($k,$v) = split /=/, $_, 2;
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$param{lc $k} = $v;
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}
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# to support addresses without <> we now require a plugin
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# hooking "rcpt_pre" to
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# return (OK, "<$rcpt>");
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# (... or anything else parseable by Qpsmtpd::Address ;-))
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# this means, a plugin can decide to (pre-)accept
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# addresses like <user@example.com.> or <user@example.com >
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# by removing the trailing "."/" " from this example...
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($rc, @msg) = $self->run_hooks("rcpt_pre", $rcpt);
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if ($rc == OK) {
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$rcpt = shift @msg;
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}
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$self->log(LOGALERT, "to email address : [$rcpt]");
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return $self->respond(501, "could not parse recipient")
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unless $rcpt =~ /^<.*>$/;
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$rcpt = (Qpsmtpd::Address->parse($rcpt))[0];
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return $self->respond(501, "could not parse recipient")
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if (!$rcpt or ($rcpt->format eq '<>'));
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($rc, @msg) = $self->run_hooks("rcpt", $rcpt, %param);
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if ($rc == DONE) {
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return 1;
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}
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elsif ($rc == DENY) {
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$msg[0] ||= 'relaying denied';
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$self->respond(550, @msg);
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}
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elsif ($rc == DENYSOFT) {
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$msg[0] ||= 'relaying denied';
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return $self->respond(450, @msg);
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}
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elsif ($rc == DENY_DISCONNECT) {
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$msg[0] ||= 'delivery denied';
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$self->log(LOGINFO, "delivery denied (@msg)");
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$self->respond(550, @msg);
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$self->disconnect;
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}
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elsif ($rc == DENYSOFT_DISCONNECT) {
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$msg[0] ||= 'relaying denied';
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$self->log(LOGINFO, "delivery denied (@msg)");
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$self->respond(421, @msg);
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$self->disconnect;
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}
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elsif ($rc == OK) {
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$self->respond(250, $rcpt->format . ", recipient ok");
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return $self->transaction->add_recipient($rcpt);
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}
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else {
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return $self->respond(450, "No plugin decided if relaying is allowed");
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}
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return 0;
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}
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sub help {
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my $self = shift;
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$self->respond(214,
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"This is qpsmtpd " .
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($self->config('smtpgreeting') ? '' : $self->version),
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"See http://smtpd.develooper.com/",
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'To report bugs or send comments, mail to <ask@develooper.com>.');
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}
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sub noop {
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my $self = shift;
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$self->respond(250, "OK");
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}
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sub vrfy {
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my $self = shift;
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# Note, this doesn't support the multiple ambiguous results
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# documented in RFC2821#3.5.1
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# I also don't think it provides all the proper result codes.
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my ($rc, @msg) = $self->run_hooks("vrfy");
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if ($rc == DONE) {
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return 1;
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}
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elsif ($rc == DENY) {
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$msg[0] ||= "Access Denied";
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$self->respond(554, @msg);
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$self->reset_transaction();
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return 1;
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}
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elsif ($rc == OK) {
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$msg[0] ||= "User OK";
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$self->respond(250, @msg);
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return 1;
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}
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else { # $rc == DECLINED or anything else
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$self->respond(252, "Just try sending a mail and we'll see how it turns out ...");
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return 1;
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}
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}
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sub rset {
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my $self = shift;
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$self->reset_transaction;
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$self->respond(250, "OK");
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}
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sub quit {
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my $self = shift;
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my ($rc, @msg) = $self->run_hooks("quit");
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if ($rc != DONE) {
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$msg[0] ||= $self->config('me') . " closing connection. Have a wonderful day.";
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$self->respond(221, @msg);
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}
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$self->disconnect();
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}
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sub disconnect {
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my $self = shift;
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$self->run_hooks("disconnect");
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$self->reset_transaction;
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}
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sub data {
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my $self = shift;
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my ($rc, @msg) = $self->run_hooks("data");
|
|
if ($rc == DONE) {
|
|
return 1;
|
|
}
|
|
elsif ($rc == DENY) {
|
|
$msg[0] ||= "Message denied";
|
|
$self->respond(554, @msg);
|
|
$self->reset_transaction();
|
|
return 1;
|
|
}
|
|
elsif ($rc == DENYSOFT) {
|
|
$msg[0] ||= "Message denied temporarily";
|
|
$self->respond(451, @msg);
|
|
$self->reset_transaction();
|
|
return 1;
|
|
}
|
|
elsif ($rc == DENY_DISCONNECT) {
|
|
$msg[0] ||= "Message denied";
|
|
$self->respond(554, @msg);
|
|
$self->disconnect;
|
|
return 1;
|
|
}
|
|
elsif ($rc == DENYSOFT_DISCONNECT) {
|
|
$msg[0] ||= "Message denied temporarily";
|
|
$self->respond(421, @msg);
|
|
$self->disconnect;
|
|
return 1;
|
|
}
|
|
$self->respond(503, "MAIL first"), return 1 unless $self->transaction->sender;
|
|
$self->respond(503, "RCPT first"), return 1 unless $self->transaction->recipients;
|
|
$self->respond(354, "go ahead");
|
|
|
|
my $buffer = '';
|
|
my $size = 0;
|
|
my $i = 0;
|
|
my $max_size = ($self->config('databytes'))[0] || 0; # this should work in scalar context
|
|
my $blocked = "";
|
|
my %matches;
|
|
my $in_header = 1;
|
|
my $complete = 0;
|
|
|
|
$self->log(LOGDEBUG, "max_size: $max_size / size: $size");
|
|
|
|
my $header = Mail::Header->new(Modify => 0, MailFrom => "COERCE");
|
|
|
|
my $timeout = $self->config('timeout');
|
|
while (defined($_ = $self->getline($timeout))) {
|
|
$complete++, last if $_ eq ".\r\n";
|
|
$i++;
|
|
|
|
# should probably use \012 and \015 in these checks instead of \r and \n ...
|
|
|
|
# Reject messages that have either bare LF or CR. rjkaes noticed a
|
|
# lot of spam that is malformed in the header.
|
|
|
|
($_ eq ".\n" or $_ eq ".\r")
|
|
and $self->respond(421, "See http://smtpd.develooper.com/barelf.html")
|
|
and return $self->disconnect;
|
|
|
|
# add a transaction->blocked check back here when we have line by line plugin access...
|
|
unless (($max_size and $size > $max_size)) {
|
|
s/\r\n$/\n/;
|
|
s/^\.\./\./;
|
|
if ($in_header and m/^\s*$/) {
|
|
$in_header = 0;
|
|
my @headers = split /^/m, $buffer;
|
|
|
|
# ... need to check that we don't reformat any of the received lines.
|
|
#
|
|
# 3.8.2 Received Lines in Gatewaying
|
|
# When forwarding a message into or out of the Internet environment, a
|
|
# gateway MUST prepend a Received: line, but it MUST NOT alter in any
|
|
# way a Received: line that is already in the header.
|
|
|
|
$header->extract(\@headers);
|
|
#$header->add("X-SMTPD", "qpsmtpd/".$self->version.", http://smtpd.develooper.com/");
|
|
|
|
$buffer = "";
|
|
|
|
# FIXME - call plugins to work on just the header here; can
|
|
# save us buffering the mail content.
|
|
|
|
# Save the start of just the body itself
|
|
$self->transaction->set_body_start();
|
|
|
|
}
|
|
|
|
# grab a copy of all of the header lines
|
|
if ($in_header) {
|
|
$buffer .= $_;
|
|
}
|
|
|
|
# copy all lines into the spool file, including the headers
|
|
# we will create a new header later before sending onwards
|
|
$self->transaction->body_write($_);
|
|
$size += length $_;
|
|
}
|
|
#$self->log(LOGDEBUG, "size is at $size\n") unless ($i % 300);
|
|
}
|
|
|
|
$self->log(LOGDEBUG, "max_size: $max_size / size: $size");
|
|
|
|
$self->transaction->header($header);
|
|
|
|
my $smtp = $self->connection->hello eq "ehlo" ? "ESMTP" : "SMTP";
|
|
my $sslheader = (defined $self->connection->notes('tls_enabled') and $self->connection->notes('tls_enabled')) ?
|
|
"(".$self->connection->notes('tls_socket')->get_cipher()." encrypted) " : "";
|
|
my $authheader = (defined $self->{_auth} and $self->{_auth} == OK) ?
|
|
"(smtp-auth username $self->{_auth_user}, mechanism $self->{_auth_mechanism})\n" : "";
|
|
|
|
$header->add("Received", "from ".$self->connection->remote_info
|
|
." (HELO ".$self->connection->hello_host . ") (".$self->connection->remote_ip
|
|
. ")\n $authheader by ".$self->config('me')." (qpsmtpd/".$self->version
|
|
.") with $sslheader$smtp; ". (strftime('%a, %d %b %Y %H:%M:%S %z', localtime)),
|
|
0);
|
|
|
|
# if we get here without seeing a terminator, the connection is
|
|
# probably dead.
|
|
$self->respond(451, "Incomplete DATA"), return 1 unless $complete;
|
|
|
|
#$self->respond(550, $self->transaction->blocked),return 1 if ($self->transaction->blocked);
|
|
$self->respond(552, "Message too big!"),return 1 if $max_size and $size > $max_size;
|
|
|
|
($rc, @msg) = $self->run_hooks("data_post");
|
|
if ($rc == DONE) {
|
|
return 1;
|
|
}
|
|
elsif ($rc == DENY) {
|
|
$msg[0] ||= "Message denied";
|
|
$self->respond(552, @msg);
|
|
}
|
|
elsif ($rc == DENYSOFT) {
|
|
$msg[0] ||= "Message denied temporarily";
|
|
$self->respond(452, @msg);
|
|
}
|
|
else {
|
|
$self->queue($self->transaction);
|
|
}
|
|
|
|
# DATA is always the end of a "transaction"
|
|
return $self->reset_transaction;
|
|
|
|
}
|
|
|
|
sub getline {
|
|
my ($self, $timeout) = @_;
|
|
|
|
alarm $timeout;
|
|
my $line = <STDIN>; # default implementation
|
|
alarm 0;
|
|
return $line;
|
|
}
|
|
|
|
sub queue {
|
|
my ($self, $transaction) = @_;
|
|
|
|
# First fire any queue_pre hooks
|
|
my ($rc, @msg) = $self->run_hooks("queue_pre");
|
|
if ($rc == DONE) {
|
|
return 1;
|
|
}
|
|
elsif ($rc != OK and $rc != DECLINED and $rc != 0 ) {
|
|
return $self->log(LOGERROR, "pre plugin returned illegal value");
|
|
return 0;
|
|
}
|
|
|
|
# If we got this far, run the queue hooks
|
|
($rc, @msg) = $self->run_hooks("queue");
|
|
if ($rc == DONE) {
|
|
return 1;
|
|
}
|
|
elsif ($rc == OK) {
|
|
$msg[0] ||= 'Queued';
|
|
$self->respond(250, @msg);
|
|
}
|
|
elsif ($rc == DENY) {
|
|
$msg[0] ||= 'Message denied';
|
|
$self->respond(552, @msg);
|
|
}
|
|
elsif ($rc == DENYSOFT) {
|
|
$msg[0] ||= 'Message denied temporarily';
|
|
$self->respond(452, @msg);
|
|
}
|
|
else {
|
|
$msg[0] ||= 'Queuing declined or disabled; try again later';
|
|
$self->respond(451, @msg);
|
|
}
|
|
|
|
# And finally run any queue_post hooks
|
|
($rc, @msg) = $self->run_hooks("queue_post");
|
|
$self->log(LOGERROR, @msg) unless ($rc == OK or $rc == 0);
|
|
}
|
|
|
|
|
|
1;
|