^L causing DKIM validation errors with opensmtpd+rspamd
Hi, Using a fairly typical OpenSMTPD+rspamd setup, I'm finding that emails sent that have the ^L escape in them come out with an invalid DKIM signature. Something basic like: filter rspamd proc-exec "filter-rspamd" listen on ... filter rspamd Everything else is otherwise pretty default and vanilla. Below is base64 of an mbox email that causes the problem when sent out using `git send-email` which pipes it to msmtp which submits it to opensmtpd+rspamd where it gets corrupted. Anyone see something like this before? Regards, Jason base64 -d > naughty-email.mbx RnJvbSA5YjM1Mzg5NWViZGUyZDgzZTA5MTk4YTYzZGJjYmVlMmNmNTg5OWQ0IE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiAiSmFzb24gQS4gRG9uZW5mZWxkIiA8SmFzb25AengyYzQuY29t PgpEYXRlOiBUdWUsIDI2IEp1bCAyMDIyIDAwOjIwOjIxICswMjAwClN1YmplY3Q6IHRlc3QgY29y cnVwdGlvbiB3aXRoIGEgXkwgbWVzc2FnZQpNSU1FLVZlcnNpb246IDEuMApDb250ZW50LVR5cGU6 IHRleHQvcGxhaW47IGNoYXJzZXQ9VVRGLTgKQ29udGVudC1UcmFuc2Zlci1FbmNvZGluZzogOGJp dAoKZGlmZiAtLWdpdCBhL0xJQ0VOU0VTIGIvTElDRU5TRVMKaW5kZXggY2QwNGZiNmU4NC4uNTMw ODkzYjFkYyAxMDA2NDQKLS0tIGEvTElDRU5TRVMKKysrIGIvTElDRU5TRVMKQEAgLTM4OSwyNiAr Mzg5LDMgQEAgQ29weXJpZ2h0IDIwMDEgYnkgU3RlcGhlbiBMLiBNb3NoaWVyIDxtb3NoaWVyQG5h LW5ldC5vcm5sLmdvdj4KICBZb3Ugc2hvdWxkIGhhdmUgcmVjZWl2ZWQgYSBjb3B5IG9mIHRoZSBH TlUgTGVzc2VyIEdlbmVyYWwgUHVibGljCiAgTGljZW5zZSBhbG9uZyB3aXRoIHRoaXMgbGlicmFy eTsgaWYgbm90LCBzZWUKICA8aHR0cHM6Ly93d3cuZ251Lm9yZy9saWNlbnNlcy8+LiAgKi8KLQwK ClRoZSBhYm92ZSBzaG91bGQgY2F1c2UgaXNzdWVzLgo=
Re: ^L causing DKIM validation errors with opensmtpd+rspamd
This appears rather easy to reproduce. Just include the char 0x0c in a message, and the signature will be invalid. Playing with the resultant message, I can make it valid by removing the \x0c character, suggesting that it's being stripped from whatever rspamd receives for signing.
Re: ^L causing DKIM validation errors with opensmtpd+rspamd
I figure I should add the rspamd list to this thread. -- Original Message -- Hi, Using a fairly typical OpenSMTPD+rspamd setup, I'm finding that emails sent that have the ^L escape in them come out with an invalid DKIM signature. Something basic like: filter rspamd proc-exec "filter-rspamd" listen on ... filter rspamd Everything else is otherwise pretty default and vanilla. Below is base64 of an mbox email that causes the problem when sent out using `git send-email` which pipes it to msmtp which submits it to opensmtpd+rspamd where it gets corrupted. Anyone see something like this before? Regards, Jason base64 -d > naughty-email.mbx RnJvbSA5YjM1Mzg5NWViZGUyZDgzZTA5MTk4YTYzZGJjYmVlMmNmNTg5OWQ0IE1vbiBTZXAgMTcg MDA6MDA6MDAgMjAwMQpGcm9tOiAiSmFzb24gQS4gRG9uZW5mZWxkIiA8SmFzb25AengyYzQuY29t PgpEYXRlOiBUdWUsIDI2IEp1bCAyMDIyIDAwOjIwOjIxICswMjAwClN1YmplY3Q6IHRlc3QgY29y cnVwdGlvbiB3aXRoIGEgXkwgbWVzc2FnZQpNSU1FLVZlcnNpb246IDEuMApDb250ZW50LVR5cGU6 IHRleHQvcGxhaW47IGNoYXJzZXQ9VVRGLTgKQ29udGVudC1UcmFuc2Zlci1FbmNvZGluZzogOGJp dAoKZGlmZiAtLWdpdCBhL0xJQ0VOU0VTIGIvTElDRU5TRVMKaW5kZXggY2QwNGZiNmU4NC4uNTMw ODkzYjFkYyAxMDA2NDQKLS0tIGEvTElDRU5TRVMKKysrIGIvTElDRU5TRVMKQEAgLTM4OSwyNiAr Mzg5LDMgQEAgQ29weXJpZ2h0IDIwMDEgYnkgU3RlcGhlbiBMLiBNb3NoaWVyIDxtb3NoaWVyQG5h LW5ldC5vcm5sLmdvdj4KICBZb3Ugc2hvdWxkIGhhdmUgcmVjZWl2ZWQgYSBjb3B5IG9mIHRoZSBH TlUgTGVzc2VyIEdlbmVyYWwgUHVibGljCiAgTGljZW5zZSBhbG9uZyB3aXRoIHRoaXMgbGlicmFy eTsgaWYgbm90LCBzZWUKICA8aHR0cHM6Ly93d3cuZ251Lm9yZy9saWNlbnNlcy8+LiAgKi8KLQwK ClRoZSBhYm92ZSBzaG91bGQgY2F1c2UgaXNzdWVzLgo=
