Add NativeOS, NTLM, and GroupName to SMBv1 results

[ghost]

Performs session setup during SMBv1 negotiations to get these fields.

How to Test

I tested this locally against this samba image, with the settings modified to allow SMBv1 (it is disabled by default).

via ./zgrab2 smb --setup-session <<< "127.0.0.1,," | jq:

{
  "ip": "x.x.x.x",
  "data": {
    "smb": {
      "status": "success",
      "protocol": "smb",
      "result": {
        "smbv1_support": true,
        "smb_version": {
          "major": 1,
          "minor": 0,
          "revision": 0,
          "version_string": "SMB 1.0"
        },
        "os_name": "Unix",
        "ntlm": "Samba 3.0.37",
        "group_name": "WORKGROUP",
        "has_ntlm": false
      },
      "timestamp": "2020-12-10T16:20:08Z"
    }
  }
}

I also tested against various hosts in the wild, though the results aren't interesting.

Against a host that doesn't support SMBv1 or requires credentials during session setup, these string fields will be empty.

Notes & Caveats

This also includes a small bugfix; in the SMBv1 negotiation, a ByteCount field was set to 14 rather than the correct 12.

Issue Tracking

[bwireman]

I think you need to update the zschema as well. @justinbastress or @codyprime correct me if I'm wrong

[codyprime]

Protocol changes look good, but zgrab2_schemas/zgrab2/smb.py needs to be updated with the new fields.

[ghost]

There will be cases where ntlm is populated but has_ntlm is false, so some clarification is needed