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# ==== # SSL/STARTTLS extention for G.Barr's Net::SMTP. # plus, enable arbitrary SMTP auth mechanism selection. # IO::Socket::SSL (also Net::SSLeay openssl), # Authen::SASL, MIME::Base64 should be installed. # package Net::SMTPS; use vars qw ( $VERSION @ISA ); $VERSION = '0.10'; use strict; use base qw ( Net::SMTP ); use Net::Cmd; # import CMD_OK, CMD_MORE, ... use Net::Config; eval { require IO::Socket::IP and unshift @ISA, 'IO::Socket::IP'; } or eval { require IO::Socket::INET6 and unshift @ISA, 'IO::Socket::INET6'; } or do { require IO::Socket::INET and unshift @ISA, 'IO::Socket::INET'; }; # Override to support SSL/TLS. sub new { my $self = shift; my $type = ref($self) || $self; my ($host, %arg); if (@_ % 2) { $host = shift; %arg = @_; } else { %arg = @_; $host = delete $arg{Host}; } my $ssl = delete $arg{doSSL}; if ($ssl =~ /ssl/i) { $arg{Port} ||= 465; } my $hosts = defined $host ? $host : $NetConfig{smtp_hosts}; my $obj; # eliminate IO::Socket::SSL from @ISA for multiple call of new. @ISA = grep { !/IO::Socket::SSL/ } @ISA; my %_args = map { +"$_" => $arg{$_} } grep {! /^SSL/} keys %arg; my $h; $_args{PeerPort} = $_args{Port} || 'smtp(25)'; $_args{Proto} = 'tcp'; $_args{Timeout} = defined $_args{Timeout} ? $_args{Timeout} : 120; foreach $h (@{ref($hosts) ? $hosts : [$hosts]}) { $_args{PeerAddr} = ($host = $h); #if ($_args{Debug}) { # foreach my $i (keys %_args) { # print STDERR "$type>>> arg $i: $_args{$i}\n"; # } #} $obj = $type->SUPER::new( %_args ) and last; } return undef unless defined $obj; $obj->autoflush(1); $obj->debug(exists $arg{Debug} ? $arg{Debug} : undef); ${*$obj}{'net_smtp_arg'} = \%arg; # OverSSL if (defined($ssl) && $ssl =~ /ssl/i) { $obj->ssl_start() or do { $obj->set_status(500, ["Cannot start SSL"]); $obj->close; return undef; }; } unless ($obj->response() == CMD_OK) { $obj->close(); return undef; } ${*$obj}{'net_smtp_exact_addr'} = $arg{ExactAddresses}; ${*$obj}{'net_smtp_host'} = $host; (${*$obj}{'net_smtp_banner'}) = $obj->message; (${*$obj}{'net_smtp_domain'}) = $obj->message =~ /\A\s*(\S+)/; unless ($obj->hello($arg{Hello} || "")) { $obj->close(); return undef; } # STARTTLS if (defined($ssl) && $ssl =~ /starttls/i && defined($obj->supports('STARTTLS')) ) { #123006 $obj->supports('STARTTLS') returns '' issue. unless ($obj->starttls()) { return undef; } $obj->hello($arg{Hello} || ""); } $obj; } sub ssl_start { my $self = shift; my $type = ref($self); my %arg = %{ ${*$self}{'net_smtp_arg'} }; my %ssl_args = map { +"$_" => $arg{$_} } grep {/^SSL/} keys %arg; eval { require IO::Socket::SSL; } or do { $self->set_status(500, ["Need working IO::Socket::SSL"]); $self->close; return undef; }; my $ssl_debug = (exists $arg{Debug} ? $arg{Debug} : undef); $ssl_debug = (exists $arg{Debug_SSL} ? $arg{Debug_SSL} : $ssl_debug); local $IO::Socket::SSL::DEBUG = $ssl_debug; (unshift @ISA, 'IO::Socket::SSL' and IO::Socket::SSL->start_SSL($self, %ssl_args, @_) and $self->isa('IO::Socket::SSL') and bless $self, $type # re-bless 'cause IO::Socket::SSL blesses himself. ) or return undef; } sub starttls { my $self = shift; ( $self->_STARTTLS() and $self->ssl_start(@_) ) or do { $self->set_status(500, ["Cannot start SSL session"]); $self->close(); return undef; }; } # Override to specify a certain auth mechanism. sub auth { my ($self, $username, $password, $mech) = @_; if ($mech) { $self->debug_print(1, "AUTH-my favorite: ". $mech . "\n") if $self->debug; my @cl_mech = split /\s+/, $mech; my @matched = (); if (exists ${*$self}{'net_smtp_esmtp'}->{'AUTH'}) { my $sv = ${*$self}{'net_smtp_esmtp'}->{'AUTH'}; $self->debug_print(1, "AUTH-server offerred: ". $sv . "\n") if $self->debug; foreach my $i (@cl_mech) { if (index($sv, $i) >= 0 && !grep(/$i/i, @matched)) { push @matched, uc($i); } } } if (@matched) { ## override AUTH mech as specified. ## if multiple mechs are specified, priority is still up to Authen::SASL module. ${*$self}{'net_smtp_esmtp'}->{'AUTH'} = join " ", @matched; $self->debug_print(1, "AUTH-negotiated: ". ${*$self}{'net_smtp_esmtp'}->{'AUTH'} . "\n") if $self->debug; } } $self->SUPER::auth($username, $password); } # Fix #121006 no timeout issue. sub getline { my $self = shift; $self->Net::Cmd::getline(@_); } sub _STARTTLS { shift->command("STARTTLS")->response() == CMD_OK } 1; __END__ =head1 NAME Net::SMTPS - SSL/STARTTLS support for Net::SMTP =head1 SYNOPSYS use Net::SMTPS; my $ssl = 'starttls'; # 'ssl' / 'starttls' / undef my $smtp = Net::SMTPS->new("smtp.example.com", Port => 587, doSSL => $ssl); =head1 DESCRIPTION This module implements a wrapper for Net::SMTP, enabling over-SSL/STARTTLS support. This module inherits most of all the methods from Net::SMTP(2.X). You may use all the friendly options that came bundled with Net::SMTP. You can control the SSL usage with the options of new() constructor method. 'doSSL' option is the switch, and, If you would like to control detailed SSL settings, you can set SSL_* options that are brought from IO::Socket::SSL. Please see the document of IO::Socket::SSL about these options detail. Just one method difference from the Net::SMTP, you can select SMTP AUTH mechanism as the third option of auth() method. As of Version 3.10 of Net::SMTP(libnet) includes SSL/STARTTLS capabilities, so this wrapper module's significance disappareing. =head1 CONSTRUCTOR =over 4 =item new ( [ HOST ] [, OPTIONS ] ) A few options added to Net::SMTP(2.X). B<doSSL> { C<ssl> | C<starttls> | undef } - to specify SSL connection type. C<ssl> makes connection wrapped with SSL, C<starttls> uses SMTP command C<STARTTLS>. =back =head1 METHODS Most of all methods of Net::SMTP are inherited as is, except auth(). =over 4 =item auth ( USERNAME, PASSWORD [, AUTHMETHOD]) Attempt SASL authentication through Authen::SASL module. AUTHMETHOD is your required method of authentication, like 'CRAM-MD5', 'LOGIN', ... etc. If your selection does not match the server-offerred AUTH mechanism, authentication negotiation may fail. =item starttls ( SSLARGS ) Upgrade existing plain connection to SSL. =back =head1 BUGS Constructor option 'Debug => (N)' (for Net::Cmd) also sets $IO::Socket::SSL::DEBUG when SSL is enabled. You can set 'Debug_SSL => {0-3}' separately. =head1 SEE ALSO L<Net::SMTP>, L<IO::Socket::SSL>, L<Authen::SASL> =head1 AUTHOR Tomo.M <tomo at cpan.org> =head1 COPYRIGHT Copyright (c) 2020 Tomo.M All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. =cut