102 lines
2.5 KiB
Plaintext
102 lines
2.5 KiB
Plaintext
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# vim: set syntax=perl ts=4 ai si:
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use MIME::Base64();
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use Digest::SHA1();
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use Digest::HMAC_SHA1();
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#
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# local_filter_cancel
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#
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sub local_filter_cancel {
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unless($hdr{Control} =~ m/^cancel\s+(<[^>]+>)/i) {
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return "Cancel with broken target ID";
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}
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return verify_cancel(\%hdr, $1, 'Cancel');
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}
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sub local_filter_after_emp {
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if (exists( $hdr{'Supersedes'} )) {
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#return verify_cancel(\%hdr, $hdr{'Supersedes'}, 'Supersedes');
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# verify_cancel is called, but not returned, so the
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# posting is unconditionally accepted
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# verify_cancel calls INN:cancel() if verification suceeds
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verify_cancel(\%hdr, $hdr{'Supersedes'}, 'Supersedes');
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}
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return undef;
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}
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sub verify_cancel($$$) {
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my $r_hdr = shift || die;
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my $target = shift;
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my $descr = shift;
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my $headers = INN::head($target) || return "$descr of non-existing ID $target";
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my %headers;
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for my $line(split(/\s*\n/, $headers)) {
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if ($line =~ m/^([[:alnum:]-]+):\s+(.*)/) {
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$headers{$1} = $2;
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}
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}
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my $lock = $headers{'Cancel-Lock'};
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if (defined($lock)) {
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my $key = $r_hdr->{'Cancel-Key'} || return "$descr of $target without Cancel-Key";
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#return verify_cancel_key($key, $lock, ' target=' . $target);
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return verify_cancel_key($key, $lock, $target);
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} else {
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# -thh
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# no cancel-lock: go ahead and cancel anyway!
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INN::cancel($target);
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}
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return undef;
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}
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sub verify_cancel_key($$$) {
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my $cancel_key = shift;
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my $cancel_lock = shift;
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my $msg = shift;
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$msg = '' unless(defined($msg));
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# -thh
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my $target = $msg;
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$msg = ' target=' . $msg;
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my %lock;
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for my $l(split(/\s+/, $cancel_lock)) {
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next unless($l =~ m/^(sha1|md5):(\S+)/);
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$lock{$2} = $1;
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}
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for my $k(split(/\s+/, $cancel_key)) {
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unless($k =~ m/^(sha1|md5):(\S+)/) {
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INN::syslog('notice', "Invalid Cancel-Key syntax '$k'.$msg");
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next;
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}
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my $key;
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if ($1 eq 'sha1') {
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$key = Digest::SHA1::sha1($2); }
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elsif ($1 eq 'md5') {
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$key = Digest::MD5::md5($2);
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}
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$key = MIME::Base64::encode_base64($key, '');
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if (exists($lock{$key})) {
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# INN::syslog('notice', "Valid Cancel-Key $key found.$msg");
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# -thh
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# article is canceled now
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INN::cancel($target) if ($target);
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return undef;
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}
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}
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INN::syslog('notice',
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"No Cancel-Key[$cancel_key] matches Cancel-Lock[$cancel_lock]$msg"
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);
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return "No Cancel-Key matches Cancel-Lock.$msg";
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}
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1;
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