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# Net::SMTP_auth.pm # # alex pleiner 2001, zeitform Internet Dienste # thanks to Graham Barr <gbarr@pobox.com> for Net::SMTP # This program is free software; you can redistribute it and/or # modify it under the same terms as Perl itself. package Net::SMTP_auth; require 5.001; use strict; use vars qw($VERSION @ISA); use Socket 1.3; use Carp; use IO::Socket; use Net::Cmd; use Net::Config; use Net::SMTP; use MIME::Base64; use Digest::HMAC_MD5 qw(hmac_md5_hex); $VERSION = "0.03"; @ISA = qw(Net::SMTP); # all other method taken from Net::SMTP sub auth_types { my $me = shift; if (exists ${*$me}{'net_smtp_esmtp'}) { my $esmtp = ${*$me}{'net_smtp_esmtp'}; if(exists $esmtp->{AUTH}) { return $esmtp->{AUTH}; } } return; } sub auth { my $me = shift; my $auth_type = shift || carp 'Net::SMTP_auth: missing argument "auth_type" to method "a +uth"'; my $user = shift; my $pass = shift; ## go for auth login if (uc($auth_type) eq "LOGIN") { $me->_AUTH("LOGIN"); if ( $me->code() == 334 ) { my $encoded_user = encode_base64($user); chomp $encoded_user; $me->command($encoded_user)->response(); if ( $me->code() == 334 ) { my $encoded_pass = encode_base64($pass); chomp $encoded_pass; $me->command($encoded_pass)->response(); if ( $me->code() == 235 ) { return 1; } } } return; ## go for auth cram-md5 } elsif (uc($auth_type) eq "CRAM-MD5") { $me->_AUTH("CRAM-MD5"); if ( $me->code() == 334 ) { my $stamp = $me->message; my $hmac = hmac_md5_hex(decode_base64($stamp), $pass); my $answer = encode_base64($user . " " . $hmac); $answer =~ s/\n +//g; $me->command($answer)->response(); if ( $me->code() == 235 ) { return 1; } } return; ## go for auth plain } elsif (uc($auth_type) eq "PLAIN") { $me->_AUTH("PLAIN"); if ( $me->code() == 334 ) { my $string = encode_base64("\000$user\000$pass"); $string =~ s/\ +n//g; $me->command($string)->response(); if ( $me->code() == 235 ) { return 1; } } return; ## other auth methods not supported } else { carp "Net::SMTP_auth: authentication type \"$auth_type\" not suppo +rted"; return; } } sub _AUTH { shift->command("AUTH", @_)->response() == CMD_OK } 1; __END__ =head1 NAME Net::SMTP_auth - Simple Mail Transfer Protocol Client with AUTHenticat +ion =head1 SYNOPSIS use Net::SMTP_auth; # Constructors $smtp = Net::SMTP_auth->new('mailhost'); $smtp = Net::SMTP_auth->new('mailhost', Timeout => 60); =head1 DESCRIPTION This module implements a client interface to the SMTP and ESMTP protocol AUTH service extension, enabling a perl5 application to talk to and authenticate against SMTP servers. This documentation assumes that you are familiar with the concepts of the SMTP protocol described + in RFC821 and with the AUTH service extension described in RFC2554. A new Net::SMTP_auth object must be created with the I<new> method. On +ce this has been done, all SMTP commands are accessed through this object +. The Net::SMTP_auth class is a subclass of Net::SMTP, which itself is a subclass of Net::Cmd and IO::Socket::INET. =head1 EXAMPLES This example authenticates via CRAM-MD5 and sends a small message to the postmaster at the SMTP server known as mailhost: #!/usr/bin/perl -w use Net::SMTP_auth; $smtp = Net::SMTP_auth->new('mailhost'); $smtp->auth('CRAM-MD5', 'user', 'password'); $smtp->mail($ENV{USER}); $smtp->to('postmaster'); $smtp->data(); $smtp->datasend("To: postmaster\n"); $smtp->datasend("\n"); $smtp->datasend("A simple test message\n"); $smtp->dataend(); $smtp->quit; =head1 CONSTRUCTOR =over 4 =item new Net::SMTP_auth [ HOST, ] [ OPTIONS ] This is the constructor for a new Net::SMTP_auth object. It is taken from Net::SMTP as all other methods (except I<auth> and I<auth_types>) are, too. =head1 METHODS Unless otherwise stated all methods return either a I<true> or I<false +> value, with I<true> meaning that the operation was a success. When a m +ethod states that it returns a value, failure will be returned as I<undef> o +r an empty list. =over 4 =item auth_types () Returns the AUTH methods supported by the server in a space separated string. This string is exacly the line given by the SMTP server after the C<EHLO> command containing the keyword C<AUTH>. =item auth ( AUTH, USER, PASSWORD ) Authenticates the user C<USER> via the authentication method C<AUTH> and the password C<PASSWORD>. Returns I<true> if successful and I<fals +e> if the authentication failed. Remember that the connection is not clos +ed if the authentication fails. You may issue a different authentication attempt. If you once are successfully authenticated, you cannot send the C<AUTH> command again. =back =head1 SEE ALSO L<Net::SMTP> and L<Net::Cmd> =head1 AUTHOR Alex Pleiner <alex@zeitform.de>, zeitform Internet Dienste. Thanks to Graham Barr <gbarr@pobox.com> for Net::SMTP. =head1 COPYRIGHT Copyright (c) 2001 zeitform Internet Dienste. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. =cut

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