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swaks
executable file
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swaks
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#!/usr/bin/perl
# use 'swaks --help' to view documentation for this program
#
# Homepage: http://jetmore.org/john/code/swaks/
# Online Docs: http://jetmore.org/john/code/swaks/latest/doc/ref.txt
# http://jetmore.org/john/code/swaks/faq.html
# Announce List: send mail to updates-swaks@jetmore.net
# Project RSS: http://jetmore.org/john/blog/c/swaks/feed/
# Twitter: http://www.twitter.com/SwaksSMTP
use strict;
$| = 1;
my($p_name) = $0 =~ m|/?([^/]+)$|;
my $p_version = build_version("DEVRELEASE", '$Id$');
my $p_usage = "Usage: $p_name [--help|--version] (see --help for details)";
my $p_cp = <<'EOM';
Copyright (c) 2003-2008,2010-2019 John Jetmore <jj33@pobox.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA.
EOM
# Get all input provided to our program, via file, env, command line, etc
my %O = %{ load_args() };
# before we do anything else, check for --help and --version
if (get_arg('help', \%O)) {
ext_usage();
exit;
}
if (get_arg('version', \%O)) {
print "$p_name version $p_version\n\n$p_cp\n";
exit;
}
# Get our functional dependencies and then print and exit early if requested
load_dependencies();
if (get_arg('get_support', \%O)) {
test_support();
exit(0);
}
# This 'synthetic' command line used for debug and reference
$G::cmdline = reconstruct_options(\%O);
# We need to fix things up a bit and set a couple of global options
my $opts = process_args(\%O);
if (scalar(keys(%G::dump_args))) {
if (my $running_state = get_running_state($opts, \%G::dump_args)) {
# --dump is intended as a debug tool for swaks internally. Always,
# unconditionally, show the user's auth password if one is given
$running_state =~ s/'%RAW_PASSWORD_STRING%'/shquote($opts->{a_pass})/ge;
print $G::trans_fh_oh $running_state;
}
exit(0);
}
elsif ($G::dump_mail) {
# if the user just wanted to generate an email body, dump it now and exit
$opts->{data} =~ s/\n\.\Z//;
print $G::trans_fh_oh $opts->{data};
exit(0);
}
# we're going to abstract away the actual connection layer from the mail
# process, so move the act of connecting into its own sub. The sub will
# set info in global hash %G::link
# XXX instead of passing raw data, have processs_opts create a link_data
# XXX hash that we can pass verbatim here
open_link();
sendmail($opts->{from}, $opts->{to}, $opts->{helo}, $opts->{data},
$opts->{a_user}, $opts->{a_pass}, $opts->{a_type});
teardown_link();
exit(0);
sub teardown_link {
if ($G::link{type} eq 'socket-inet' || $G::link{type} eq 'socket-unix') {
# XXX need anything special for tls teardown?
close($G::link{sock});
ptrans(11, "Connection closed with remote host.");
} elsif ($G::link{type} eq 'pipe') {
delete($SIG{PIPE});
$SIG{CHLD} = 'IGNORE';
close($G::link{sock}{wr});
close($G::link{sock}{re});
ptrans(11, "Connection closed with child process.");
}
}
sub open_link {
if ($G::link{type} eq 'socket-inet') {
ptrans(11, 'Trying ' . $G::link{server} . ':' . $G::link{port} . '...');
$@ = "";
my @extra_options = ();
push(@extra_options, "LocalAddr", $G::link{lint}) if ($G::link{lint});
push(@extra_options, "LocalPort", $G::link{lport}) if ($G::link{lport});
# INET6 also supports v4, so use it for everything if it's available. That
# allows the module to handle A vs AAAA records on domain lookups where the
# user hasn't set a specific ip version to be used. If INET6 isn't available
# and it's a domain that only has AAAA records, INET will just handle it like
# a bogus record and we just won't be able to connect
if (avail("ipv6")) {
if ($G::link{force_ipv6}) {
push(@extra_options, "Domain", Socket::AF_INET6() );
} elsif ($G::link{force_ipv4}) {
push(@extra_options, "Domain", Socket::AF_INET() );
}
$G::link{sock} = IO::Socket::INET6->new(
PeerAddr => $G::link{server},
PeerPort => $G::link{port},
Proto => 'tcp',
Timeout => $G::link{timeout},
@extra_options
);
} else {
$G::link{sock} = IO::Socket::INET->new(
PeerAddr => $G::link{server},
PeerPort => $G::link{port},
Proto => 'tcp',
Timeout => $G::link{timeout},
@extra_options
);
}
if ($@) {
ptrans(12, "Error connecting" . ($G::link{lint} ? " $G::link{lint}" : '') .
" to $G::link{server}:$G::link{port}:\n\t$@");
exit(2);
}
ptrans(11, "Connected to $G::link{server}.");
} elsif ($G::link{type} eq 'socket-unix') {
ptrans(11, 'Trying ' . $G::link{sockfile} . '...');
$SIG{PIPE} = 'IGNORE';
$@ = "";
$G::link{sock} = IO::Socket::UNIX->new(Peer => $G::link{sockfile}, Timeout => $G::link{timeout});
if ($@) {
ptrans(12, 'Error connecting to ' . $G::link{sockfile} . ":\n\t$@");
exit(2);
}
ptrans(11, 'Connected to ' . $G::link{sockfile} . '.');
} elsif ($G::link{type} eq 'pipe') {
$SIG{PIPE} = 'IGNORE';
$SIG{CHLD} = 'IGNORE';
ptrans(11, "Trying pipe to $G::link{process}...");
eval{ open2($G::link{sock}{re}, $G::link{sock}{wr}, $G::link{process}); };
if ($@) {
ptrans(12, 'Error connecting to ' . $G::link{process} . ":\n\t$@");
exit(2);
}
select((select($G::link{sock}{wr}), $| = 1)[0]);
select((select($G::link{sock}{re}), $| = 1)[0]);
ptrans(11, 'Connected to ' . $G::link{process} . '.');
} else {
ptrans(12, 'Unknown or unimplemented connection type ' . $G::link{type});
exit(3);
}
}
sub sendmail {
my $from = shift; # envelope-from
my $to = shift; # envelope-to
my $helo = shift; # who am I?
my $data = shift; # body of message (content after DATA command)
my $a_user = shift; # what user to auth with?
my $a_pass = shift; # what pass to auth with
my $a_type = shift; # what kind of auth (this must be set to to attempt)
my $ehlo = {}; # If server is esmtp, save advertised features here
do_smtp_proxy() if ($G::proxy{try});
# start up tls if -tlsc specified
if ($G::tls_on_connect) {
if (start_tls()) {
tls_post_start();
do_smtp_drop() if ($G::drop_after eq 'tls');
do_smtp_quit(1, 0) if ($G::quit_after eq 'tls');
} else {
ptrans(12, "TLS startup failed ($G::link{tls}{res})");
exit(29);
}
}
# read the server's 220 banner.
do_smtp_gen(undef, '220') || do_smtp_quit(1, 21);
do_smtp_drop() if ($G::drop_after eq 'connect');
do_smtp_quit(1, 0) if ($G::quit_after eq 'connect');
# Send a HELO string
$G::drop_before_read = 1 if ($G::drop_after_send eq 'first-helo');
do_smtp_helo($helo, $ehlo, $G::protocol) || do_smtp_quit(1, 22);
do_smtp_drop() if ($G::drop_after eq 'first-helo');
do_smtp_quit(1, 0) if ($G::quit_after eq 'first-helo');
if ($G::xclient{before_tls}) {
xclient_try($helo, $ehlo);
}
# handle TLS here if user has requested it
if ($G::tls) {
# 0 = tls succeeded
# 1 = tls not advertised
# 2 = tls advertised and attempted negotiations failed
# note there's some duplicate logic here (with process_args) but I think
# it's best to do as thorough a job covering the options in both places
# so as to minimize chance of options falling through the cracks
$G::drop_before_read = 1 if ($G::drop_after_send eq 'tls');
my $result = do_smtp_tls($ehlo);
if ($result == 1) {
ptrans(12, "Host did not advertise STARTTLS");
do_smtp_quit(1, 29) if (!$G::tls_optional);
} elsif ($result == 2) {
ptrans(12, "STARTTLS attempted but failed");
exit(29) if ($G::tls_optional != 1);
}
} elsif ($G::tls_optional == 2 && $ehlo->{STARTTLS}) {
ptrans(12, "TLS requested, advertised, and locally unavailable. Exiting");
do_smtp_quit(1, 29);
}
do_smtp_drop() if ($G::drop_after eq 'tls');
do_smtp_quit(1, 0) if ($G::quit_after eq 'tls');
if (!$G::xclient{before_tls}) {
xclient_try($helo, $ehlo);
}
#if ($G::link{tls}{active} && $ehlo->{STARTTLS}) {
if ($G::link{tls}{active} && !$G::tls_on_connect) {
# According to RFC3207, we need to forget state info and re-EHLO here
$ehlo = {};
$G::drop_before_read = 1 if ($G::drop_after_send eq 'helo');
do_smtp_helo($helo, $ehlo, $G::protocol) || do_smtp_quit(1, 32);
}
do_smtp_drop() if ($G::drop_after_send eq 'helo'); # haaaack. Need to use first-helo for this. Just quit here to prevent the mail from being delivered
do_smtp_drop() if ($G::drop_after eq 'helo');
do_smtp_quit(1, 0) if ($G::quit_after eq 'helo');
# handle auth here if user has requested it
if ($a_type) {
# 0 = auth succeeded
# 1 = auth not advertised
# 2 = auth advertised but not attempted, no matching auth types
# 3 = auth advertised but not attempted, auth not supported
# 4 = auth advertised and attempted but no type succeeded
# note there's some duplicate logic here (with process_args) but I think
# it's best to do as thorough a job covering the options in both places
# so as to minimize chance of options falling through the cracks
$G::drop_before_read = 1 if ($G::drop_after_send eq 'auth');
my $result = do_smtp_auth($ehlo, $a_type, $a_user, $a_pass);
if ($result == 1) {
ptrans(12, "Host did not advertise authentication");
do_smtp_quit(1, 28) if (!$G::auth_optional);
} elsif ($result == 2) {
if ($G::auth_type eq 'ANY') {
ptrans(12, "Auth not attempted, no advertised types available");
do_smtp_quit(1, 28) if ($G::auth_optional != 1);
} else {
ptrans(12, "Auth not attempted, requested type not available");
do_smtp_quit(1, 28) if (!$G::auth_optional);
}
} elsif ($result == 3) {
ptrans(12, "Auth advertised but not supported locally");
do_smtp_quit(1, 28) if ($G::auth_optional != 1);
} elsif ($result == 4) {
ptrans(12, "No authentication type succeeded");
do_smtp_quit(1, 28) if ($G::auth_optional != 1);
}
} elsif ($G::auth_optional == 2 && $ehlo->{AUTH}) {
ptrans(12, "Auth requested, advertised, and locally unavailable. Exiting");
do_smtp_quit(1, 28);
}
do_smtp_drop() if ($G::drop_after eq 'auth');
do_smtp_quit(1, 0) if ($G::quit_after eq 'auth');
# send MAIL
# 0 = mail succeeded
# 1 = prdr required but not advertised
$G::drop_before_read = 1 if ($G::drop_after_send eq 'mail');
my $result = do_smtp_mail($ehlo, $from); # failures in this handled by smtp_mail_callback
if ($result == 1) {
ptrans(12, "Host did not advertise PRDR support");
do_smtp_quit(1, 30);
}
do_smtp_drop() if ($G::drop_after eq 'mail');
do_smtp_quit(1, 0) if ($G::quit_after eq 'mail');
# send RCPT (sub handles multiple, comma-delimited recips)
$G::drop_before_read = 1 if ($G::drop_after_send eq 'rcpt');
do_smtp_rcpt($to); # failures in this handled by smtp_rcpt_callback
# note that smtp_rcpt_callback increments
# $G::smtp_rcpt_failures at every failure. This and
# $G::smtp_rcpt_total are used after DATA for LMTP
do_smtp_drop() if ($G::drop_after eq 'rcpt');
do_smtp_quit(1, 0) if ($G::quit_after eq 'rcpt');
# send DATA
$G::drop_before_read = 1 if ($G::drop_after_send eq 'data');
do_smtp_gen('DATA', '354') || do_smtp_quit(1, 25);
do_smtp_drop() if ($G::drop_after eq 'data');
# send the actual data
$G::drop_before_read = 1 if ($G::drop_after_send eq 'dot');
do_smtp_data($data, $G::suppress_data) || do_smtp_quit(1, 26);
do_smtp_drop() if ($G::drop_after eq 'dot');
# send QUIT
do_smtp_quit(0) || do_smtp_quit(1, 27);
}
sub xclient_try {
my $helo = shift;
my $ehlo = shift;
if ($G::xclient{try}) {
# 0 - xclient succeeded normally
# 1 - xclient not advertised
# 2 - xclient advertised but not attempted, mismatch in requested attrs
# 3 - xclient attempted but did not succeed
$G::drop_before_read = 1 if ($G::drop_after_send eq 'xclient');
my $result = do_smtp_xclient($ehlo);
if ($result == 1) {
ptrans(12, "Host did not advertise XCLIENT");
do_smtp_quit(1, 33) if (!$G::xclient{optional});
} elsif ($result == 2) {
ptrans(12, "Host did not advertise requested XCLIENT attributes");
do_smtp_quit(1, 33) if (!$G::xclient{optional});
} elsif ($result == 3) {
ptrans(12, "XCLIENT attempted but failed. Exiting");
do_smtp_quit(1, 33) if ($G::xclient{optional} != 1);
} else {
do_smtp_drop() if ($G::drop_after eq 'xclient');
do_smtp_quit(1, 0) if ($G::quit_after eq 'xclient');
# re-helo if the XCLIENT command succeeded
$G::drop_before_read = 1 if ($G::drop_after_send eq 'helo');
do_smtp_helo($helo, $ehlo, $G::protocol) || do_smtp_quit(1, 34);
do_smtp_drop() if ($G::drop_after eq 'helo');
do_smtp_quit(1, 0) if ($G::quit_after eq 'helo');
}
}
}
sub tls_post_start {
ptrans(11, "TLS started with cipher $G::link{tls}{cipher_string}");
if ($G::link{tls}{local_cert_subject}) {
ptrans(11, "TLS local DN=\"$G::link{tls}{local_cert_subject}\"");
} else {
ptrans(11, "TLS no local certificate set");
}
ptrans(11, "TLS peer DN=\"$G::link{tls}{cert_subject}\"");
if ($G::tls_get_peer_cert eq 'STDOUT') {
ptrans(11, $G::link{tls}{cert_x509});
} elsif ($G::tls_get_peer_cert) {
open(CERT, ">$G::tls_get_peer_cert") ||
ptrans(12, "Couldn't open $G::tls_get_peer_cert for writing: $!");
print CERT $G::link{tls}{cert_x509}, "\n";
close(CERT);
}
}
sub start_tls {
my %t = (); # This is a convenience var to access $G::link{tls}{...}
$G::link{tls} = \%t;
Net::SSLeay::load_error_strings();
Net::SSLeay::SSLeay_add_ssl_algorithms();
Net::SSLeay::randomize();
if (!($t{con} = Net::SSLeay::CTX_new())) {
$t{res} = "CTX_new(): " . Net::SSLeay::ERR_error_string(Net::SSLeay::ERR_get_error());
return(0);
}
my $ctx_options = &Net::SSLeay::OP_ALL;
if (scalar(@G::tls_protocols)) {
if ($G::tls_protocols[0] =~ /^no_/i) {
foreach my $p (@G::tls_supported_protocols) {
if (grep /^no_$p$/i, @G::tls_protocols) {
no strict "refs";
$ctx_options |= &{"Net::SSLeay::OP_NO_$p"}();
}
}
} else {
foreach my $p (@G::tls_supported_protocols) {
if (!grep /^$p$/i, @G::tls_protocols) {
no strict "refs";
$ctx_options |= &{"Net::SSLeay::OP_NO_$p"}();
}
}
}
}
Net::SSLeay::CTX_set_options($t{con}, $ctx_options);
Net::SSLeay::CTX_set_verify($t{con}, 0x01, 0) if ($G::tls_verify);
if ($G::tls_ca_path) {
my @args = ('', $G::tls_ca_path);
@args = ($G::tls_ca_path, '') if (-f $G::tls_ca_path);
if (!Net::SSLeay::CTX_load_verify_locations($t{con}, @args)) {
$t{res} = "Unable to set set CA path to (" . join(',', @args) . "): "
. Net::SSLeay::ERR_error_string(Net::SSLeay::ERR_get_error());
return(0);
}
} else {
Net::SSLeay::CTX_set_default_verify_paths($t{con});
}
if ($G::tls_cipher) {
if (!Net::SSLeay::CTX_set_cipher_list($t{con}, $G::tls_cipher)) {
$t{res} = "Unable to set cipher list to $G::tls_cipher: "
. Net::SSLeay::ERR_error_string(Net::SSLeay::ERR_get_error());
return(0);
}
}
if ($G::tls_cert && $G::tls_key) {
if (!Net::SSLeay::CTX_use_certificate_file($t{con}, $G::tls_cert, &Net::SSLeay::FILETYPE_PEM)) {
$t{res} = "Unable to add cert file $G::tls_cert to SSL CTX: "
. Net::SSLeay::ERR_error_string(Net::SSLeay::ERR_get_error());
return(0);
}
if (!Net::SSLeay::CTX_use_PrivateKey_file($t{con}, $G::tls_key, &Net::SSLeay::FILETYPE_PEM)) {
$t{res} = "Unable to add key file $G::tls_key to SSL CTX: "
. Net::SSLeay::ERR_error_string(Net::SSLeay::ERR_get_error());
return(0);
}
}
if (!($t{ssl} = Net::SSLeay::new($t{con}))) {
$t{res} = "new(): " . Net::SSLeay::ERR_error_string(Net::SSLeay::ERR_get_error());
return(0);
}
if ($G::tls_sni_hostname) {
if (!Net::SSLeay::set_tlsext_host_name($t{ssl}, $G::tls_sni_hostname)) {
$t{res} = "Unable to set SNI hostname to $G::tls_sni_hostname: "
. Net::SSLeay::ERR_error_string(Net::SSLeay::ERR_get_error());
return(0);
}
}
if ($G::link{type} eq 'pipe') {
Net::SSLeay::set_wfd($t{ssl}, fileno($G::link{sock}{wr})); # error check?
Net::SSLeay::set_rfd($t{ssl}, fileno($G::link{sock}{re})); # error check?
} else {
Net::SSLeay::set_fd($t{ssl}, fileno($G::link{sock})); # error check?
}
$t{active} = Net::SSLeay::connect($t{ssl}) == 1 ? 1 : 0;
if (!$t{active}) {
$t{res} = "connect(): " . Net::SSLeay::ERR_error_string(Net::SSLeay::ERR_get_error());
return(0);
}
# egrep 'define.*VERSION\b' *.h
# when adding new types here, see also the code that pushes supported values onto tls_supported_protocols
$t{version} = Net::SSLeay::version($t{ssl});
if ($t{version} == 0x0002) {
$t{version} = "SSLv2"; # openssl/ssl2.h
} elsif ($t{version} == 0x0300) {
$t{version} = "SSLv3"; # openssl/ssl3.h
} elsif ($t{version} == 0x0301) {
$t{version} = "TLSv1"; # openssl/tls1.h
} elsif ($t{version} == 0x0302) {
$t{version} = "TLSv1.1"; # openssl/tls1.h
} elsif ($t{version} == 0x0303) {
$t{version} = "TLSv1.2"; # openssl/tls1.h
} elsif ($t{version} == 0x0304) {
$t{version} = "TLSv1.3"; # openssl/tls1.h
} elsif ($t{version} == 0xFEFF) {
$t{version} = "DTLSv1"; # openssl/dtls1.h
} elsif ($t{version} == 0xFEFD) {
$t{version} = "DTLSv1.2"; # openssl/dtls1.h
} else {
$t{version} = sprintf("UNKNOWN(0x%04X)", $t{version});
}
$t{cipher} = Net::SSLeay::get_cipher($t{ssl});
if (!$t{cipher}) {
$t{res} = "empty response from get_cipher()";
return(0);
}
$t{cipher_bits} = Net::SSLeay::get_cipher_bits($t{ssl}, undef);
if (!$t{cipher_bits}) {
$t{res} = "empty response from get_cipher_bits()";
return(0);
}
$t{cipher_string} = sprintf("%s:%s:%s", $t{version}, $t{cipher}, $t{cipher_bits});
$t{cert} = Net::SSLeay::get_peer_certificate($t{ssl});
if (!$t{cert}) {
$t{res} = "error response from get_peer_certificate()";
return(0);
}
chomp($t{cert_x509} = Net::SSLeay::PEM_get_string_X509($t{cert}));
$t{cert_subject} = Net::SSLeay::X509_NAME_oneline(Net::SSLeay::X509_get_subject_name($t{cert}));
if ($G::tls_cert && $G::tls_key) {
$t{local_cert} = Net::SSLeay::get_certificate($t{ssl});
chomp($t{local_cert_x509} = Net::SSLeay::PEM_get_string_X509($t{local_cert}));
$t{local_cert_subject} = Net::SSLeay::X509_NAME_oneline(Net::SSLeay::X509_get_subject_name($t{local_cert}));
}
return($t{active});
}
sub deprecate {
my $message = shift;
ptrans(12, "DEPRECATION WARNING: $message");
}
sub ptrans {
my $c = shift; # transaction flag
my $m = shift; # message to print
my $b = shift; # be brief in what we print
my $a = shift; # return the message in an array ref instead of printing
my $o = $G::trans_fh_oh || \*STDOUT;
my $f = '';
return if (($G::hide_send && int($c/10) == 2) ||
($G::hide_receive && int($c/10) == 3) ||
($G::hide_informational && $c == 11) ||
($G::hide_all));
# global option silent controls what we echo to the terminal
# 0 - print everything
# 1 - don't show anything until you hit an error, then show everything
# received after that (done by setting option to 0 on first error)
# 2 - don't show anything but errors
# >=3 - don't print anything
if ($G::silent > 0) {
return if ($G::silent >= 3);
return if ($G::silent == 2 && $c%2 != 0);
if ($G::silent == 1 && !$G::ptrans_seen_error) {
if ($c%2 != 0) {
return();
} else {
$G::ptrans_seen_error = 1;
}
}
}
# 1x is program messages
# 2x is smtp send
# 3x is smtp recv
# x = 1 is info/normal
# x = 2 is error
# x = 3 dump output
# program info
if ($c == 11) { $f = $G::no_hints_info ? '' : '==='; }
# program error
elsif ($c == 12) { $f = $G::no_hints_info ? '' : '***'; $o = $G::trans_fh_eh || \*STDERR; }
# smtp send info
elsif ($c == 21) { $f = $G::no_hints_send ? '' : ($G::link{tls}{active} ? ' ~>' : ' ->'); }
# smtp send error
elsif ($c == 22) { $f = $G::no_hints_send ? '' : ($G::link{tls}{active} ? '*~>' : '**>'); }
# smtp send dump output
elsif ($c == 23) { $f = $G::no_hints_send ? '' : ' >'; }
# smtp recv info
elsif ($c == 31) { $f = $G::no_hints_recv ? '' : ($G::link{tls}{active} ? '<~ ' : '<- '); }
# smtp recv error
elsif ($c == 32) { $f = $G::no_hints_recv ? '' : ($G::link{tls}{active} ? '<~*' : '<**'); }
# smtp recv dump output
elsif ($c == 33) { $f = $G::no_hints_recv ? '' : '< '; }
# something went unexpectedly
else { $f = '???'; }
$f .= ' ' if ($f);
if ($b) {
# split to tmp list to prevent -w gripe
my @t = split(/\n/ms, $m); $m = scalar(@t) . " lines sent";
}
$m =~ s/\n/\n$f/msg;
if ($a) {
$m = "$f$m";
return([ split(/\n/, $m) ]);
}
else {
print $o "$f$m\n";
}
}
sub do_smtp_quit {
my $exit = shift;
my $err = shift;
# Ugh. Because PIPELINING allows mail's and rcpt's send to be disconnected,
# and possibly with a QUIT between them, we need to set a global "we have
# told the server we quit already" flag to prevent double-quits
return(1) if ($G::link{quit_sent});
$G::link{quit_sent} = 1;
$G::link{allow_lost_cxn} = 1;
my $r = do_smtp_gen('QUIT', '221');
$G::link{allow_lost_cxn} = 0;
handle_disconnect($err) if ($G::link{lost_cxn});
if ($exit) {
teardown_link();
exit $err;
}
return($r);
}
sub do_smtp_drop {
ptrans(11, "Dropping connection");
exit(0);
}
sub do_smtp_tls {
my $e = shift; # ehlo config hash
# 0 = tls succeeded
# 1 = tls not advertised
# 2 = tls advertised and attempted negotiations failed
if (!$e->{STARTTLS}) {
return(1);
} elsif (!do_smtp_gen("STARTTLS", '220')) {
return(2);
} elsif (!start_tls()) {
ptrans(12, "TLS startup failed ($G::link{tls}{res})");
return(2);
}
tls_post_start();
return(0);
}
sub do_smtp_xclient {
my $e = shift;
# 0 - xclient succeeded normally
# 1 - xclient not advertised
# 2 - xclient advertised but not attempted, mismatch in requested attrs
# 3 - xclient attempted but did not succeed
if (!$e->{XCLIENT}) {
return(1);
}
my @parts = ();
foreach my $attr (keys %{$G::xclient{attr}}) {
if (!$e->{XCLIENT}{$attr}) {
return(2) if (!$G::xclient{no_verify});
}
}
foreach my $string (@{$G::xclient{strings}}) {
my $str = "XCLIENT " . $string;
do_smtp_gen($str, '220') || return(3);
}
return(0);
}
# see xtext encoding in http://tools.ietf.org/html/rfc1891
sub to_xtext {
my $string = shift;
return join('', map { ($_ == 0x2b || $_ == 0x3d || $_ <= 0x20 || $_ >= 0xff)
? sprintf("+%02X", $_)
: chr($_)
} (unpack("C*", $string)));
}
sub do_smtp_auth {
my $e = shift; # ehlo config hash
my $at = shift; # auth type
my $au = shift; # auth user
my $ap = shift; # auth password
return(1) if (!$e->{AUTH});
return(3) if ($G::auth_unavailable);
my $auth_attempted = 0; # set to true if we ever attempt auth
foreach my $btype (@$at) {
# if server doesn't support, skip type (may change in future)
next if (!$e->{AUTH}{$btype});
foreach my $type (@{$G::auth_map_t{'CRAM-MD5'}}) {
if ($btype eq $type) {
return(0) if (do_smtp_auth_cram($au, $ap, $type));
$auth_attempted = 1;
}
}
foreach my $type (@{$G::auth_map_t{'CRAM-SHA1'}}) {
if ($btype eq $type) {
return(0) if (do_smtp_auth_cram($au, $ap, $type));
$auth_attempted = 1;
}
}
foreach my $type (@{$G::auth_map_t{'DIGEST-MD5'}}) {
if ($btype eq $type) {
return(0) if (do_smtp_auth_digest($au, $ap, $type));
$auth_attempted = 1;
}
}
foreach my $type (@{$G::auth_map_t{'NTLM'}}) {
if ($btype eq $type) {
return(0) if (do_smtp_auth_ntlm($au, $ap, $type));
$auth_attempted = 1;
}
}
foreach my $type (@{$G::auth_map_t{'PLAIN'}}) {
if ($btype eq $type) {
return(0) if (do_smtp_auth_plain($au, $ap, $type));
$auth_attempted = 1;
}
}
foreach my $type (@{$G::auth_map_t{'LOGIN'}}) {
if ($btype eq $type) {
return(0) if (do_smtp_auth_login($au, $ap, $type));
$auth_attempted = 1;
}
}
}
return $auth_attempted ? 4 : 2;
}
sub do_smtp_auth_ntlm {
my $u = shift; # auth user
my $p = shift; # auth password
my $as = shift; # auth type (since NTLM might be SPA or MSN)
my $r = ''; # will store smtp response
my $auth_string = "AUTH $as";
do_smtp_gen($auth_string, '334') || return(0);
my $d = db64(Authen::NTLM::ntlm());
$auth_string = eb64($d);
do_smtp_gen($auth_string, '334', \$r, '',
$G::auth_showpt ? "$d" : '',
$G::auth_showpt ? \&unencode_smtp : '') || return(0);
$r =~ s/^....//; # maybe something a little better here?
Authen::NTLM::ntlm_domain($G::auth_extras{DOMAIN});
Authen::NTLM::ntlm_user($u);
Authen::NTLM::ntlm_password($p);
$d = db64(Authen::NTLM::ntlm($r));
$auth_string = eb64($d);
do_smtp_gen($auth_string, '235', \$r, '', $G::auth_showpt ? "$d" : '') || return(0);
return(1);
}
sub do_smtp_auth_digest {
my $u = shift; # auth user
my $p = shift; # auth password
my $as = shift; # auth string
my $r = ''; # will store smtp response
my $e = ''; # will store Authen::SASL errors
my @digest_uri = ();
if (exists($G::auth_extras{"DMD5-SERV-TYPE"})) {
$digest_uri[0] = $G::auth_extras{"DMD5-SERV-TYPE"};
} else {
$digest_uri[0] = 'smtp';
}
if (exists($G::auth_extras{"DMD5-HOST"})) {
$digest_uri[1] = $G::auth_extras{"DMD5-HOST"};
} else {
if ($G::link{type} eq 'socket-unix') {
$digest_uri[1] = $G::link{sockfile};
$digest_uri[1] =~ s|[^a-zA-Z0-9\.\-]|-|g;
} elsif ($G::link{type} eq 'pipe') {
$digest_uri[1] = $G::link{process};
$digest_uri[1] =~ s|[^a-zA-Z0-9\.\-]|-|g;
} else {
$digest_uri[1] = $G::link{server};
}
}
if (exists($G::auth_extras{"DMD5-SERV-NAME"})) {
# There seems to be a hole in the Authen::SASL interface where there's
# no option to directory provide the digest-uri serv-name. But we can
# trick it into using the value we want by tacking it onto the end of host
$digest_uri[1] .= '/' . $G::auth_extras{"DMD5-SERV-NAME"};
}
my $auth_string = "AUTH $as";
do_smtp_gen($auth_string, '334', \$r, '', '', $G::auth_showpt ? \&unencode_smtp : '')
|| return(0);
$r =~ s/^....//; # maybe something a little better here?
$r = db64($r);
my $callbacks = { user => $u, pass => $p };
if (exists($G::auth_extras{REALM})) {
$callbacks->{realm} = $G::auth_extras{REALM};
}
my $sasl = Authen::SASL->new(
debug => 1,
mechanism => 'DIGEST-MD5',
callback => $callbacks,
);
my $sasl_client = $sasl->client_new(@digest_uri);
# Force the DIGEST-MD5 session to use qop=auth. I'm open to exposing this setting
# via some swaks options, but I don't know enough about the protocol to just guess
# here. I do know that letting it auto-negotiate didn't work in my reference
# environment. sendmail advertised auth,auth-int,auth-conf, but when Authen::SASL
# chose auth-int the session would fail (server would say auth succeeded, but then
# immediately terminate my session when I sent MAIL). My reference client
# (Mulberry) always sent auth, and indeed forcing swaks to auth also seems to work.
# If anyone out there knows more about this please let me know.
$sasl_client->property('maxssf' => 0);
$auth_string = $sasl_client->client_step($r);
if ($e = $sasl_client->error()) {
ptrans('12', "Error received from Authen::SASL sub-system: $e");
return(0);
}
do_smtp_gen(eb64($auth_string), '334', \$r, '',
$G::auth_showpt ? "$auth_string" : '',
$G::auth_showpt ? \&unencode_smtp : '')
|| return(0);
$r =~ s/^....//; # maybe something a little better here?
$r = db64($r);
$auth_string = $sasl_client->client_step($r);
if ($e = $sasl_client->error()) {
ptrans('12', "Canceling SASL exchange, error received from Authen::SASL sub-system: $e");
$auth_string = '*';
}
#do_smtp_gen(eb64($auth_string), '235', \$r, '', $G::auth_showpt ? "$auth_string" : '')
do_smtp_gen($auth_string, '235', \$r, '', $auth_string)
|| return(0);
if ($e = $sasl_client->error()) {
ptrans('12', "Error received from Authen::SASL sub-system: $e");
return(0);
}
return(0) if (!$sasl_client->is_success());
return(1);
}
# This can handle both CRAM-MD5 and CRAM-SHA1
sub do_smtp_auth_cram {
my $u = shift; # auth user
my $p = shift; # auth password
my $as = shift; # auth string
my $r = ''; # will store smtp response
my $auth_string = "AUTH $as";
do_smtp_gen($auth_string, '334', \$r, '', '', $G::auth_showpt ? \&unencode_smtp : '')
|| return(0);
$r =~ s/^....//; # maybe something a little better here?
# specify which type of digest we need based on $as
my $d = get_digest($p, $r, ($as =~ /-SHA1$/ ? 'sha1' : 'md5'));
$auth_string = eb64("$u $d");
do_smtp_gen($auth_string, '235', undef, '', $G::auth_showpt ? "$u $d" : '') || return(0);
return(1);
}
sub do_smtp_auth_login {
my $u = shift; # auth user
my $p = shift; # auth password
my $as = shift; # auth string
do_smtp_gen("AUTH $as", '334', undef, '', '', $G::auth_showpt ? \&unencode_smtp : '')
|| return(0);
do_smtp_gen(eb64($u), '334', undef, '', $G::auth_showpt ? $u : '', $G::auth_showpt ? \&unencode_smtp : '')
|| return(0);
do_smtp_gen(eb64($p), '235', undef, '',
$G::auth_showpt ? ($G::auth_hidepw || $p) : eb64($G::auth_hidepw || $p))
|| return(0);
return(1);
}
sub do_smtp_auth_plain {
my $u = shift; # auth user
my $p = shift; # auth password
my $as = shift; # auth string
return(do_smtp_gen("AUTH $as " . eb64("\0$u\0$p"), '235', undef, '',
$G::auth_showpt ? "AUTH $as \\0$u\\0" . ($G::auth_hidepw || $p)
: "AUTH $as " . eb64("\0$u\0" . ($G::auth_hidepw || $p))));
}
sub do_smtp_helo {
my $h = shift; # helo string to use
my $e = shift; # this is a hashref that will be populated w/ server options
my $p = shift; # protocol for the transaction
my $r = ''; # this'll be populated by do_smtp_gen
if ($p eq 'esmtp' || $p eq 'lmtp') {
my $l = $p eq 'lmtp' ? "LHLO" : "EHLO";
if (do_smtp_gen("$l $h", '250', \$r)) {
# There's not a standard structure for the $e hashref, each
# key is stored in the manner that makes the most sense
foreach my $l (split(/\n/, $r)) {
$l =~ s/^....//;
if ($l =~ /^AUTH=?(.*)$/) {
map { $e->{AUTH}{uc($_)} = 1 } (split(' ', $1));
} elsif ($l =~ /^XCLIENT\s*(.*?)$/) {
$e->{XCLIENT} = {}; # prime the pump in case no attributes were advertised
map { $e->{XCLIENT}{uc($_)} = 1 } (split(' ', $1));
} elsif ($l =~ /^STARTTLS$/) {
$e->{STARTTLS} = 1;
} elsif ($l =~ /^PIPELINING$/) {
$e->{PIPELINING} = 1;
$G::pipeline_adv = 1;
} elsif ($l =~ /^PRDR$/) {
$e->{PRDR} = 1;
}
}
return(1);
}
}
if ($p eq 'esmtp' || $p eq 'smtp') {
return(do_smtp_gen("HELO $h", '250'));
}
return(0);
}
sub do_smtp_mail {
my $e = shift; # ehlo response
my $a = shift; # from address
my $m = "MAIL FROM:<$a>";
if ($G::prdr) {
if (!$e->{PRDR}) {
return(1); # PRDR was required but was not advertised. Return error and let caller handle it
} else {
$m .= " PRDR";
}
}
transact(cxn_string => $m, expect => '250', defer => 1, fail_callback => \&smtp_mail_callback);
return(0); # the callback handles failures, so just return here
}
# this only really needs to exist until I figure out a clever way of making
# do_smtp_quit the callback while still preserving the exit codes
sub smtp_mail_callback {
do_smtp_quit(1, 23);
}
sub do_smtp_rcpt {
my $m = shift; # string of comma separated recipients
my $f = 0; # The number of failures we've experienced
my @a = split(/,/, $m);
$G::smtp_rcpt_total = scalar(@a);
foreach my $addr (@a) {
transact(cxn_string => 'RCPT TO:<' . $addr . '>', expect => '250', defer => 1,
fail_callback => \&smtp_rcpt_callback);
}
return(1); # the callback handles failures, so just return here
}
sub smtp_rcpt_callback {
# record that a failure occurred
$G::smtp_rcpt_failures++;
# if the number of failures is the same as the total rcpts (if every rcpt rejected), quit.
if ($G::smtp_rcpt_failures == $G::smtp_rcpt_total) {
do_smtp_quit(1, 24);
}
}
sub do_smtp_data {
my $m = shift; # string to send
my $b = shift; # be brief in the data we send
my $r = ''; # will store smtp response
my $e = $G::prdr ? '(250|353)' : '250';
my $calls = $G::smtp_rcpt_total - $G::smtp_rcpt_failures;
my $ok = transact(cxn_string => $m, expect => $e, summarize_output => $b, return_text => \$r);
# now be a little messy - lmtp is not a lockstep after data - we need to
# listen for as many calls as we had accepted recipients