[pmg-devel] [PATCH pmg-api] ruledb: match field: improve handling of invalid regular expressions

[Dominik Csapak <d.csapak@proxmox.com>]

by not saving them in the first place if they die during execution.
We test this by using them once on an empty string.

Since users may have saved already invalid ones, only warn if we encounter
such a regex in 'parse_entity' during execution instead of die'ing. Otherwise
pmg-smtp-filter will exit and restart, possibly leading to wrongly denying
mails (and possibly sending out NDRs) before spam checking was done.

Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>
---
 src/PMG/RuleDB/MatchField.pm | 17 +++++++++++++----
 1 file changed, 13 insertions(+), 4 deletions(-)

diff --git a/src/PMG/RuleDB/MatchField.pm b/src/PMG/RuleDB/MatchField.pm
index 2b56058..177a283 100644
--- a/src/PMG/RuleDB/MatchField.pm
+++ b/src/PMG/RuleDB/MatchField.pm
@@ -69,7 +69,13 @@ sub save {
 
     defined($self->{ogroup}) || die "undefined ogroup: ERROR";
 
-    my $new_value = "$self->{field}:$self->{field_value}";
+    my $regex = $self->{field_value};
+
+    # test regex for validity
+    eval { "" =~ /$regex/i; };
+    die "invalid regex: $@\n" if $@;
+
+    my $new_value = "$self->{field}:$regex";
     $new_value =~ s/\\/\\\\/g;
     $new_value = encode('UTF-8', $new_value);
 
@@ -111,9 +117,12 @@ sub parse_entity {
 	    my $decvalue = PMG::Utils::decode_rfc1522($value);
 	    $decvalue = PMG::Utils::try_decode_utf8($decvalue);
 
-	    if ($decvalue =~ m|$self->{field_value}|i) {
-		push @$res, $id;
-	    }
+	    eval {
+		if ($decvalue =~ m|$self->{field_value}|i) {
+		    push @$res, $id;
+		}
+	    };
+	    warn "invalid regex: $@\n" if $@;
 	}
     }
 
-- 
2.30.2