S/MIME mime type application/octet-stream

2014-11-06 Thread Jan Hejl 

Hello,

i found that the file command detects S/MIME attachment (smime.p7s) 
within a signed email as an application/octet-stream insted of 
application/pkcs7. Author of the file tool tells that it's impossible to 
detect application/pkcs7. Does anybody knows why?


Thank you
Jan



smime.p7s
Description: Elektronicky podpis S/MIME

Re: [openssl-users] S/MIME mime type application/octet-stream

2014-11-06 Thread Erwann Abalea 

This is my first attempt ever at magic(5) voodoo:

0 byte 0x30
0x01 byte 0x80
0x02 string \x06\x09\x2a\x86\x48\x86\xf7\x0d\x01\x07\x02 Indefinite 
length pkcs7-signedData

!:mime application/pkcs7
0x02 string \x06\x09\x2a\x86\x48\x86\xf7\x0d\x01\x07\x03 Indefinite 
length pkcs7-envelopedData

!:mime application/pkcs7
0x03 search/10 \x06\x09\x2a\x86\x48\x86\xf7\x0d\x01\x07\x02 Definite 
length pkcs7-signedData

!:mime application/pkcs7
0x03 search/10 \x06\x09\x2a\x86\x48\x86\xf7\x0d\x01\x07\x03 Definite 
length pkcs7-envelopedData

!:mime application/pkcs7

I'm pretty sure it's ugly, suboptimal, and whatever. It WORKSFORME, on 
an indefinite length signature as well as the corresponding definite one 
recreated by OpenSSL.

I haven't contempted the idea of parsing ASN.1/BER in magic(5) parlance.

--
Erwann ABALEA

Le 06/11/2014 17:24, Jan Hejl a écrit :

Hello,

i found that the file command detects S/MIME attachment (smime.p7s) 
within a signed email as an application/octet-stream insted of 
application/pkcs7. Author of the file tool tells that it's impossible 
to detect application/pkcs7. Does anybody knows why?


Thank you
Jan



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