added Authentication-Results header, with provider
dkim, dmarc, fcrdns (iprev), spf, and smtp-auth
This commit is contained in:
Matt Simerson
parent
b1afbabf4c
commit
4ae16219bd
@ -271,6 +271,34 @@ sub store_deferred_reject {
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return (DECLINED);
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}
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sub store_auth_results {
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my ($self, $value) = @_;
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my @headers = $self->transaction->header->get('Authentication-Results');
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chomp @headers;
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my @deleteme;
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for ( my $i = 0; $i < scalar @headers; $i++ ) {
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my @values = split /;/, $headers[$i];
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if ( $self->config->('me') ne $values[0] ) { # some other MTA
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# we generally want to remove Authentication-Results headers added by other
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# MTAs (so our downstream can trust the A-R header we insert), but we also
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# don't want to invalidate DKIM signatures.
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# TODO: parse the DKIM signature(s) to see if A-R header is signed
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if ( ! $self->transaction->header->get('DKIM-Signature') ) {
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$self->log(LOGINFO, "deleted auth-results from $_");
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push @deleteme, $i;
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};
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next;
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};
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push @values, $value;
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$self->log(LOGINFO, "appended to auth-results: $value");
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$self->transaction->header->replace('Authentication->Results', join('; ', @values ), $i);
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}
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foreach ( @deleteme ) {
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$self->transaction->header->delete('Authentication-Results', $_);
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};
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};
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sub init_resolver {
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my $self = shift;
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my $timeout = $self->{_args}{dns_timeout} || shift || 5;
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@ -770,6 +770,7 @@ sub data_respond {
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my $esmtp = substr($smtp, 0, 1) eq "E";
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my $authheader = '';
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my $sslheader = '';
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my $auth_result = 'none';
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if (defined $self->connection->notes('tls_enabled')
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and $self->connection->notes('tls_enabled'))
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@ -780,15 +781,28 @@ sub data_respond {
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. " encrypted) ";
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}
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if (defined $self->{_auth} and $self->{_auth} == OK) {
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$smtp .= "A" if $esmtp; # RFC3848
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$authheader =
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"(smtp-auth username $self->{_auth_user}, mechanism $self->{_auth_mechanism})\n";
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if (defined $self->{_auth} ) {
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my $mech = $self->{_auth_mechanism};
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my $user = $self->{_auth_user};
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$auth_result = "auth=";
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if ( $self->{_auth} == OK) {
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$smtp .= "A" if $esmtp; # RFC3848
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$authheader = "(smtp-auth username $user, mechanism $mech)\n";
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$auth_result .= 'pass';
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}
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else {
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$auth_result .= 'fail';
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};
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$auth_result .= " ($mech) smtp.auth=$user";
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}
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$header->add("Received",
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$header->add('Received',
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$self->received_line($smtp, $authheader, $sslheader), 0);
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# RFC 5451: used in AUTH, DKIM, DOMAINKEYS, SENDERID, SPF
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$header->add('Authentication-Results',
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join('; ', $self->config('me'), $auth_result ) );
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# if we get here without seeing a terminator, the connection is
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# probably dead.
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unless ($complete) {
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11
plugins/dkim
11
plugins/dkim
@ -222,6 +222,9 @@ sub validate_it {
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my $result = $dkim->result;
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my $mess = $self->get_details($dkim);
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$self->store_auth_results("dkim=" .$dkim->result_detail . " header.i=@".$dkim->signature->domain);
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#$self->add_header($mess);
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foreach my $t (qw/ pass fail invalid temperror none /) {
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next if $t ne $result;
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my $handler = 'handle_sig_' . $t;
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@ -286,8 +289,7 @@ sub handle_sig_fail {
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my ($self, $dkim, $mess) = @_;
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$self->adjust_karma(-1);
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return
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$self->get_reject("DKIM signature invalid: " . $dkim->result_detail,
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return $self->get_reject("signature invalid: " . $dkim->result_detail,
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$mess);
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}
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@ -316,12 +318,10 @@ sub handle_sig_invalid {
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$self->log(LOGINFO, $mess);
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if ($prs->{accept}) {
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$self->add_header($mess);
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$self->log(LOGERROR, "error, invalid signature but accept policy!?");
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return DECLINED;
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}
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elsif ($prs->{neutral}) {
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$self->add_header($mess);
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$self->log(LOGERROR, "error, invalid signature but neutral policy?!");
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return DECLINED;
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}
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@ -333,7 +333,6 @@ sub handle_sig_invalid {
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# this should never happen
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$self->log(LOGINFO, "error, invalid signature, unhandled");
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$self->add_header($mess);
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return DECLINED;
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}
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@ -527,8 +526,6 @@ sub get_selector {
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sub add_header {
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my $self = shift;
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my $header = shift or return;
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# consider adding Authentication-Results header, (RFC 5451)
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$self->qp->transaction->header->add('X-DKIM-Authentication', $header, 0);
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}
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@ -122,24 +122,31 @@ sub data_post_handler {
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# evaluation returned a "pass" result.
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my $spf_dom = $transaction->notes('spf_pass_host');
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my $effective_policy = ( $self->{_args}{is_subdomain} && defined $policy->{sp} )
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? $policy->{sp} : $policy->{p};
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# 5. Conduct identifier alignment checks.
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return DECLINED
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if $self->is_aligned($from_dom, $org_dom, $policy, $spf_dom );
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if ( $self->is_aligned($from_dom, $org_dom, $policy, $spf_dom ) ) {
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$self->store_auth_results("dmarc=pass (p=$effective_policy) d=$from_dom");
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return DECLINED;
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};
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# 6. Apply policy. Emails that fail the DMARC mechanism check are
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# disposed of in accordance with the discovered DMARC policy of the
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# Domain Owner. See Section 6.2 for details.
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if ( $self->{_args}{is_subdomain} && defined $policy->{sp} ) {
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return DECLINED if lc $policy->{sp} eq 'none';
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if ( lc $effective_policy eq 'none' ) {
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$self->store_auth_results("dmarc=fail (p=none) d=$from_dom");
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return DECLINED;
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};
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return DECLINED if lc $policy->{p} eq 'none';
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my $pct = $policy->{pct} || 100;
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if ( $pct != 100 && int(rand(100)) >= $pct ) {
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$self->log("fail, tolerated, policy, sampled out");
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$self->store_auth_results("dmarc=sampled_out (p=$effective_policy) d=$from_dom");
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return DECLINED;
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};
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$self->store_auth_results("dmarc=fail (p=$effective_policy) d=$from_dom");
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return $self->get_reject("failed DMARC policy");
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}
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@ -88,6 +88,38 @@ From Wikipedia summary:
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3. Any A or AAAA record returned by the second query is then compared against the original IP address (check_ip_match), and if there is a match, then the FCrDNS check passes.
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=head1 iprev
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# https://www.ietf.org/rfc/rfc5451.txt
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2.4.3. "iprev" Results
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The result values are used by the "iprev" method, defined in
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Section 3, are as follows:
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pass: The DNS evaluation succeeded, i.e., the "reverse" and
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"forward" lookup results were returned and were in agreement.
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fail: The DNS evaluation failed. In particular, the "reverse" and
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"forward" lookups each produced results but they were not in
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agreement, or the "forward" query completed but produced no
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result, e.g., a DNS RCODE of 3, commonly known as NXDOMAIN, or an
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RCODE of 0 (NOERROR) in a reply containing no answers, was
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returned.
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temperror: The DNS evaluation could not be completed due to some
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error that is likely transient in nature, such as a temporary DNS
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error, e.g., a DNS RCODE of 2, commonly known as SERVFAIL, or
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other error condition resulted. A later attempt may produce a
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final result.
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permerror: The DNS evaluation could not be completed because no PTR
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data are published for the connecting IP address, e.g., a DNS
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RCODE of 3, commonly known as NXDOMAIN, or an RCODE of 0 (NOERROR)
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in a reply containing no answers, was returned. This prevented
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completion of the evaluation.
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=cut
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=head1 AUTHOR
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@ -136,9 +168,8 @@ sub connect_handler {
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sub data_post_handler {
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my ($self, $transaction) = @_;
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my $match = $self->connection->notes('fcrdns_match') || 0;
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$transaction->header->add('X-Fcrdns', $match ? 'Yes' : 'No', 0);
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my $match = $self->connection->notes('fcrdns_match') || 'error';
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$self->store_auth_results("iprev=$match");
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return (DECLINED);
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}
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@ -182,13 +213,25 @@ sub has_reverse_dns {
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my $res = $self->init_resolver();
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my $ip = $self->qp->connection->remote_ip;
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my $query = $res->query($ip) or do {
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my $query = $res->query($ip, 'PTR') or do {
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if ($res->errorstring eq 'NXDOMAIN') {
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$self->adjust_karma(-1);
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$self->connection->notes('fcrdns_match', 'permerror');
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$self->log(LOGINFO, "fail, no rDNS: " . $res->errorstring);
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return;
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}
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$self->log(LOGINFO, "fail, error getting rDNS: " . $res->errorstring);
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if ( $res->errorstring eq 'SERVFAIL' ) {
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$self->log(LOGINFO, "fail, error getting rDNS: " . $res->errorstring);
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$self->connection->notes('fcrdns_match', 'temperror');
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}
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elsif ( $res->errorstring eq 'NOERROR' ) {
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$self->log(LOGINFO, "fail, no PTR (NOERROR)" );
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$self->connection->notes('fcrdns_match', 'permerror');
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}
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else {
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$self->connection->notes('fcrdns_match', 'fail');
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$self->log(LOGINFO, "fail, error getting rDNS: " . $res->errorstring);
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};
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return;
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};
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@ -203,6 +246,7 @@ sub has_reverse_dns {
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if (!$hits) {
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$self->adjust_karma(-1);
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$self->log(LOGINFO, "fail, no PTR records");
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$self->connection->notes('fcrdns_match', 'permerror');
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return;
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}
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@ -218,11 +262,13 @@ sub has_forward_dns {
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foreach my $host (keys %{$self->{_args}{ptr_hosts}}) {
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$host .= '.' if '.' ne substr($host, -1, 1); # fully qualify name
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my $query = $res->search($host) or do {
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my $query = $res->query($host) or do {
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if ($res->errorstring eq 'NXDOMAIN') {
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$self->connection->notes('fcrdns_match', 'permerror');
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$self->log(LOGDEBUG, "host $host does not exist");
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next;
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}
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$self->connection->notes('fcrdns_match', 'fail');
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$self->log(LOGDEBUG, "query for $host failed (",
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$res->errorstring, ")");
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next;
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@ -235,11 +281,13 @@ sub has_forward_dns {
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$self->check_ip_match($rr->address) and return 1;
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}
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if ($hits) {
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$self->connection->notes('fcrdns_match', 'fail');
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$self->log(LOGDEBUG, "PTR host has forward DNS") if $hits;
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return 1;
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}
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}
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$self->adjust_karma(-1);
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$self->connection->notes('fcrdns_match', 'fail');
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$self->log(LOGINFO, "fail, no PTR hosts have forward DNS");
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return;
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}
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@ -250,7 +298,7 @@ sub check_ip_match {
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if ($ip eq $self->qp->connection->remote_ip) {
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$self->log(LOGDEBUG, "forward ip match");
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$self->connection->notes('fcrdns_match', 1);
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$self->connection->notes('fcrdns_match', 'pass');
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$self->adjust_karma(1);
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return 1;
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}
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@ -262,7 +310,7 @@ sub check_ip_match {
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if ($dns_net eq $rem_net) {
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$self->log(LOGNOTICE, "forward network match");
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$self->connection->notes('fcrdns_match', 1);
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$self->connection->notes('fcrdns_match', 'pass');
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return 1;
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}
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return;
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@ -133,10 +133,12 @@ sub mail_handler {
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return (DECLINED, "SPF - no response");
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}
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$self->store_auth_results("spf=$code smtp.mailfrom=".$sender->host);
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if ($code eq 'pass') {
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$self->adjust_karma(1);
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$transaction->notes('spf_pass_host', lc $sender->host);
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$self->log(LOGINFO, "pass, $code: $why");
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$self->log(LOGINFO, "pass, $why");
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return (DECLINED);
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}
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@ -235,8 +237,6 @@ sub data_post_handler {
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$transaction->header->add('Received-SPF', $result->received_spf_header, 0);
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# consider also adding SPF status to Authentication-Results header
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return DECLINED;
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}
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