[pmg-devel] [PATCH pmg-api 5/7] dkim: signer: degrade missing domain in from header to info

[Stoiko Ivanov]

for mail locally generated by PMG the From header can contain only a
local-part (postmaster).

While such mail cannot be sensibly signed, it should be treated as if
the domain is not listed in DKIM-domains - by an log message on 'info'
level instead of a `die`.
the sub with the changed behavior is only used in this module, and
sign_entity as external entry-point is only called in eval context,
resulting in a log message on level 'warn' so potential for regression
should not be too high.

Signed-off-by: Stoiko Ivanov <s.ivanov at proxmox.com>
---
 src/PMG/DKIMSign.pm | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/src/PMG/DKIMSign.pm b/src/PMG/DKIMSign.pm
index 6f309c8..be8f1d0 100644
--- a/src/PMG/DKIMSign.pm
+++ b/src/PMG/DKIMSign.pm
@@ -59,6 +59,10 @@ sub signing_domain {
     my $input_domain;
     if ($use_domain eq 'header') {
 	$input_domain = parse_headers_for_signing($entity);
+	if (!defined($input_domain)) {
+	    syslog('info', "DKIM signing: no domain found in the headers from $sender_email");
+	    return 0;
+	}
     } else {
 	my @parts = split('@', $sender_email);
 	die "no domain in sender e-mail\n" if scalar(@parts) < 2;
@@ -107,7 +111,6 @@ sub parse_headers_for_signing {
 	$domain = $addresses[0]->host();
     }
 
-    die "there is no sender in the header\n" if !defined($domain);
     return $domain;
 }
 
-- 
2.39.5