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#!/usr/bin/perl -T
use warnings;
use strict;
use Errno qw/EINTR/;
use Net::SSLeay qw/die_now die_if_ssl_error/;
use Socket qw/INADDR_LOOPBACK AF_INET SOCK_STREAM pack_sockaddr_in
SOL_SOCKET SO_REUSEADDR SHUT_RDWR/;
BEGIN {
Net::SSLeay::load_error_strings();
Net::SSLeay::SSLeay_add_ssl_algorithms();
Net::SSLeay::randomize();
}
socket(my $S, AF_INET, SOCK_STREAM, 0) or die;
setsockopt($S, SOL_SOCKET, SO_REUSEADDR, pack("l", 1)) or die;
bind($S, pack_sockaddr_in(10143, INADDR_LOOPBACK)) or die "bind: $!\n";
listen($S, 1) or die "listen: $!";
my $CONFDIR = $ENV{HOME} =~ /\A(\p{Print}+)\z/ ? "$1/.dovecot/conf.d" : die;
my $CTX = Net::SSLeay::CTX_new() or die_now("SSL_CTX_new");
Net::SSLeay::CTX_set_mode($CTX,
Net::SSLeay::MODE_ENABLE_PARTIAL_WRITE() |
Net::SSLeay::MODE_ACCEPT_MOVING_WRITE_BUFFER() |
Net::SSLeay::MODE_AUTO_RETRY() | # don't fail SSL_read on renegotiation
Net::SSLeay::MODE_RELEASE_BUFFERS() );
Net::SSLeay::CTX_use_PrivateKey_file($CTX, "$CONFDIR/dovecot.key", &Net::SSLeay::FILETYPE_PEM)
or die_if_ssl_error("Can't load private key: $!");
Net::SSLeay::CTX_use_certificate_file($CTX, "$CONFDIR/dovecot.pem", &Net::SSLeay::FILETYPE_PEM)
or die_if_ssl_error("Can't load certificate: $!");
while (1) {
my $sockaddr = accept(my $conn, $S) or do {
next if $! == EINTR;
die "accept: $!";
};
$conn->printflush("* OK IMAP4rev1 Server\r\n");
$conn->getline() =~ /\A(\S+) CAPABILITY\r\n\z/ or die;
$conn->printflush("* CAPABILITY IMAP4rev1 STARTTLS\r\n");
$conn->printflush("$1 OK CAPABILITY completed\r\n");
$conn->getline() =~ /\A(\S+) STARTTLS\r\n\z/ or die;
# These responses preceed the TLS handshake hence are not authenticated!
$conn->print("$1 OK Begin TLS\r\n");
$conn->print("* CAPABILITY IMAP4rev1 LOGINDISABLED X-injected\r\n");
# Note: tag format must match Net::IMAP::InterIMAP->_cmd_init()
$conn->printf("%06d OK CAPABILITY injected\r\n", $1+1);
$conn->flush();
my $ssl = Net::SSLeay::new($CTX) or die_if_ssl_error("SSL_new");
Net::SSLeay::set_fd($ssl, $conn) or die_if_ssl_error("SSL_set_fd");
Net::SSLeay::accept($ssl) and die_if_ssl_error("SSL_accept");
Net::SSLeay::ssl_read_CRLF($ssl) =~ /\A(\S+) CAPABILITY\r\n\z/ or die_now("SSL_read");
Net::SSLeay::ssl_write_CRLF($ssl, "* CAPABILITY IMAP4rev1 AUTH=LOGIN\r\n$1 OK CAPABILITY completed");
Net::SSLeay::ssl_read_CRLF($ssl) =~ /\A(\S+) LOGIN .*\r\n\z/ or die_now("SSL_read");
Net::SSLeay::ssl_write_CRLF($ssl, "$1 OK [CAPABILITY IMAP4rev1] LOGIN completed");
Net::SSLeay::free($ssl);
close($conn);
last;
}
END {
Net::SSLeay::CTX_free($CTX) if defined $CTX;
if (defined $S) {
shutdown($S, SHUT_RDWR) or warn "shutdown: $!";
close($S) or print STDERR "Can't close: $!\n";
}
}
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