]>
git.proxmox.com Git - pmg-api.git/blob - src/PMG/DKIMSign.pm
5 use Mail
::DKIM
::Signer
;
6 use Mail
::DKIM
::TextWrap
;
7 use Crypt
::OpenSSL
::RSA
;
15 use base
qw(Mail::DKIM::Signer);
18 my ($class, $selector, $sign_all) = @_;
20 die "no selector provided\n" if ! $selector;
23 Algorithm
=> 'rsa-sha256',
24 Method
=> 'relaxed/relaxed',
25 Selector
=> $selector,
26 KeyFile
=> "/etc/pmg/dkim/$selector.private",
29 my $self = $class->SUPER::new
(%opts);
31 $self->{sign_all
} = $sign_all;
36 # MIME::Entity can output to all objects responding to 'print' (and does so in
37 # chunks) Mail::DKIM::Signer has a 'PRINT' method and expects each line
38 # terminated with "\r\n"
42 my ($self, $chunk) = @_;
43 $chunk =~ s/\012/\015\012/g;
47 sub create_signature
{
51 return $self->signature->as_string();
54 #determines which domain should be used for signing based on the e-mailaddress
56 my ($self, $sender_email) = @_;
58 my @parts = split('@', $sender_email);
59 die "no domain in sender e-mail\n" if scalar(@parts) < 2;
60 my $input_domain = $parts[-1];
62 if ($self->{sign_all
}) {
63 $self->domain($input_domain) if $self->{sign_all
};
67 # check that input_domain is in/a subdomain of in the
68 # dkimdomains, falling back to the relay domains.
69 my $dkimdomains = PVE
::INotify
::read_file
('dkimdomains');
70 $dkimdomains = PVE
::INotify
::read_file
('domains') if !scalar(%$dkimdomains);
72 # Sort domains by length first, so if we have both a sub domain and its parent
73 # the correct one will be returned
74 foreach my $domain (sort { length($b) <=> length($a) || $a cmp $b} keys %$dkimdomains) {
75 if ( $input_domain =~ /\Q$domain\E$/i ) {
76 $self->domain($domain);
81 syslog
('info', "not DKIM signing mail from $sender_email");
88 my ($entity, $selector, $sender, $sign_all) = @_;
90 die "no selector provided\n" if ! $selector;
92 #oversign certain headers
93 my @oversign_headers = (
105 push(@oversign_headers, grep { $entity->head->mime_attr($_) } @cond_headers);
107 my $extended_headers = { map { $_ => '+' } @oversign_headers };
109 my $signer = __PACKAGE__-
>new($selector, $sign_all);
111 $signer->extended_headers($extended_headers);
113 if ($signer->signing_domain($sender)) {
114 $entity->print($signer);
115 my $signature = $signer->create_signature();
116 $entity->head->add('DKIM-Signature', $signature, 0);
123 # key-handling and utility methods
124 sub get_selector_info
{
127 die "no selector provided\n" if !defined($selector);
130 my $privkeytext = PVE
::Tools
::file_get_contents
("/etc/pmg/dkim/$selector.private");
131 my $privkey = Crypt
::OpenSSL
::RSA-
>new_private_key($privkeytext);
132 $size = $privkey->size() * 8;
134 $pubkey = $privkey->get_public_key_x509_string();
138 $pubkey =~ s/-----(?:BEGIN|END) PUBLIC KEY-----//g;
141 # split record into 250 byte chunks for DNS-server compatibility
142 # see opendkim-genkey
143 my $record = qq{$selector._domainkey\tIN\tTXT\t( "v=DKIM1; h=sha256; k=rsa; "\n\t "p=};
144 my $len = length($pubkey);
148 $record .= substr($pubkey, $cur);
151 $record .= substr($pubkey, $cur, 250) . qq{"\n\t "};
156 $record .= qq{" ) ; ----- DKIM key $selector};
158 return ($record, $size);
162 my ($selector, $keysize, $force) = @_;
164 die "no selector provided\n" if !defined($selector);
165 die "no keysize provided\n" if !defined($keysize);
166 die "invalid keysize\n" if ($keysize < 1024);
167 my $privkey_file = "/etc/pmg/dkim/$selector.private";
170 my $genkey = $force || (! -e
$privkey_file);
172 my ($privkey, $cursize);
174 my $privkeytext = PVE
::Tools
::file_get_contents
($privkey_file);
175 $privkey = Crypt
::OpenSSL
::RSA-
>new_private_key($privkeytext);
176 $cursize = $privkey->size() * 8;
178 die "error checking $privkey_file: $@\n" if $@;
179 die "$privkey_file already exists, but has different size ($cursize bits)\n"
180 if $cursize != $keysize;
182 my $cmd = ['openssl', 'genrsa', '-out', $privkey_file, $keysize];
183 PMG
::Utils
::run_silent_cmd
($cmd);
185 my $cfg = PMG
::Config-
>new();
186 $cfg->set('admin', 'dkim_selector', $selector);
188 PMG
::Utils
::reload_smtp_filter
();
191 PMG
::Config
::lock_config
($code, "unable to set DKIM key ($selector - $keysize bits)");