I'm trying to build a MDM server, given ruby code by Apple is :

p7sign = OpenSSL::PKCS7::PKCS7.new(req.body)
store = OpenSSL::X509::Store.new
p7sign.verify(nil, store, nil, OpenSSL::PKCS7::NOVERIFY)
signers = p7sign.signers

I have this very basic NodeJS code to receive & store the POST payload :

exports.profile = function(req, res) {
    var queryData = "";
    req.on('data', function(chunk) {
        queryData += chunk;
    });
    req.on('end', function() {
        fs.writeFileSync('out.p7s', queryData);
    });
    res.send('1');
};

However the given file : https://dl.dropbox.com/u/2310128/ios-mdm.p7s

Can't seems to be recognized by openssl at all!!

openssl pkcs7 -in req.p7s -inform DER -print_certs

Is returning :

unable to load PKCS7 object
140735186985436:error:0D07207B:asn1 encoding routines:ASN1_get_object:header too long:asn1_lib.c:150:

Any idea what could go wrong here? Is there some extra padding I should remove? Is the given file not PKCS7 at all?

Request headers :

{ host: '192.168.22.39:3000',
  'accept-encoding': 'gzip, deflate',
  'content-type': 'application/pkcs7-signature',
  'accept-language': 'fr-fr',
  cookie: 'connect.sid=s%3Andcjz5pGCdb1AYXhNG8Us5mh.5szK2X1cOpnih9X5kCbqTUdpv8EyJRwNHl4VC6M5Gwk',
  accept: '*/*',
  'content-length': '3564',
  connection: 'keep-alive',
  'user-agent': 'Profile/1.0' }

Thanks!!

I had to use Buffer.concat to correctly append binary buffers & make it work.