On Mon 27/Feb/2023 16:17:33 +0100 Tim Wicinski wrote:
I agree that we should fix this tolerance in the bis document.
I agree we should fix the grammar, but the general syntax of dmarcbis allows
trailing spaces.
I tried and verified it using the IETF's extractor[*] and an ABNF to regex
conversion tool[†] (I found no other tools to check ABNF).
I had to simplify the rules, e.g. excluding URI.
For dmarcbis, I had to replace dmarc-version with the old one, because the tool
doesn't support RFC 7405 (There's an open issue on Github[‡]). The tool
complained about 'dmarc-value = %x20-3A | %x3C-7E', where | has to be replaced
with /.
The results are as follows:
$ printf 'v=DMARC1; p=reject; pct=100\nv=DMARC1; p=reject; pct=100;\nv=DMARC1;
p=reject; pct=100 \n' | grep -nP '^[Vv][ \t]*\=[ \t]*DMARC1[ \t]*;[ \t]*(([Pp][
\t]*\=[
\t]*([Nn][Oo][Nn][Ee]|[Qq][Uu][Aa][Rr][Aa][Nn][Tt][Ii][Nn][Ee]|[Rr][Ee][Jj][Ee][Cc][Tt])))?([
\t]*;[ \t]*([Ss][Pp][ \t]*\=[
\t]*([Nn][Oo][Nn][Ee]|[Qq][Uu][Aa][Rr][Aa][Nn][Tt][Ii][Nn][Ee]|[Rr][Ee][Jj][Ee][Cc][Tt])))?([
\t]*;[ \t]*[Rr][Uu][Aa][ \t]*\=[ \t]*((\![0-9]+[KkMmGgTt]?)?)([ \t]*,[
\t]*((\![0-9]+[KkMmGgTt]?)?))*)?([ \t]*;[ \t]*[Rr][Uu][Ff][ \t]*\=[
\t]*((\![0-9]+[KkMmGgTt]?)?)([ \t]*,[ \t]*((\![0-9]+[KkMmGgTt]?)?))*)?([ \t]*;[
\t]*([Aa][Dd][Kk][Ii][Mm][ \t]*\=[ \t]*[RrSs]))?([ \t]*;[
\t]*([Aa][Ss][Pp][Ff][ \t]*\=[ \t]*[RrSs]))?([ \t]*;[ \t]*[Rr][Ii][ \t]*\=[
\t]*[0-9]+)?([ \t]*;[ \t]*([Ff][Oo][ \t]*\=[ \t]*(0|1|[DdSs])([ \t]*\:[
\t]*(0|1|[DdSs]))*))?([ \t]*;[ \t]*[Pp][Cc][Tt][ \t]*\=[ \t]*[0-9]{1,3})?([
\t]*;[ \t]*)?$'
1:v=DMARC1; p=reject; pct=100
2:v=DMARC1; p=reject; pct=100;
and
$ printf 'v=DMARC1; p=reject; pct=100\nv=DMARC1; p=reject; pct=100;\nv=DMARC1;
p=reject; pct=100 \n' | grep -nP '^[Vv][ \t]*\=[ \t]*DMARC1([ \t]*;[
\t]*[A-Za-z]+[ \t]*\=[ \t]*[ -\:\<-~]+)*([ \t]*;[ \t]*)?$'
1:v=DMARC1; p=reject; pct=100
2:v=DMARC1; p=reject; pct=100;
3:v=DMARC1; p=reject; pct=100
Best
Ale
--
[*] https://author-tools.ietf.org/abnf
[†] https://www.msweet.org/abnf/index.html
[‡] https://github.com/michaelrsweet/abnf/issues/5
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