Re: Sign and send *.pdf as an attachment

[Bernhard Fröhlich]

Sonenberk Peter schrieb:

Hi!


(the message can be empty).
Do you know how to do it? Is openssl suitable tool for it?

I tried these steps:
-> /usr/bin/uuencode -m file.pdf file.pdf > codefile.code

-> I corrected smime.p7s file by vi editor - the MIME attachment header:

I need to send a sign message with .pdf file as attachment from Linux MTA server -> openssl smime -sign -text -binary -in codefile.code -out smime.p7s -signer some.pem -inkey somekey.pem

Hope it helps.
Ted
;)

I'm not sure, but don't you break the signature if you edit the attachment's header after having made the signature? Or does the signature exclude the header? Maybe you should first build the "attachment" part including the correct headers and do "openssl smime -sign" on then. Another thing, are you sure uuencode creates a valid MIME part? This "begin-base64 644 file.pdf" header doesn't look to me like it should be there... Maybe try "openssl enc -base64" to do the base64 encoding.

MIME-Version: 1.0

DB2C00CE1827FA76401CFB5"

This is an S/MIME signed message

------87C3A5C3CDB2C00CE1827FA76401CFB5
Content-Type: application/pdf; name="file.pdf"
Content-Transfer-Encoding: base64
Content-Description: file.pdf
Content-Disposition: attachment; filename="file.pdf"
<CRLF>
begin-base64 644 file.pdf
JVBERi0xLjQNCjEgMCBvYmoNCjw8DQovUHJvZHVjZXIgKCkNCi9BdXRob3Ig
KCkNCi9DcmVhdGlvbkRhdGUgKEQ6MjAwNzExMjMxMTM0NTcpDQovQ3JlYXRv
ciAoKQ0KL0tleXdvcmRzICgpDQovU3ViamVjdCAoKQ0KL1RpdGxlICgpDQov

etc.

-> And when I sent this file via script:

#!/bin/bash
ADR=/tmp
SOUBOR=$ADR/some.txt
#
/bin/echo "From: Pepa Dolni Lhota <[EMAIL PROTECTED]>" > $SOUBOR
/bin/echo "To: [EMAIL PROTECTED]" >> $SOUBOR
/bin/echo "Subject: Sign file file.pdf is in attachment" >> $SOUBOR
/bin/echo "Reply-to: [EMAIL PROTECTED]" >> $SOUBOR
/bin/echo "Errors-to: [EMAIL PROTECTED]" >> $SOUBOR
#
/bin/echo " " >> $SOUBOR
/bin/cat $ADR/smime.p7s >> $SOUBOR
/bin/echo " " >> $SOUBOR
#
/usr/sbin/sendmail.sendmail -t -F [EMAIL PROTECTED] < $SOUBOR
exit 0
#

-> MUA client (Thunderbird) obtained message O.K. Certificate is good
for reading, but reading of the attachment ended with error:
Failed to load document (error 3) 'file:///home/someone/file.pdf'
When I open e-mail via Ctrl+U all seems to be all right.



Sonenberk
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Content-Type: multipart/signed; protocol="application/x-pkcs7-signature"; micalg=sha1; boundary="----87C3A5C3C Be so kind and try to get me some help how sign and send ".pdf" attachment. Thank you very much and best regards,

smime.p7s
Description: S/MIME Cryptographic Signature