Export to MISP: add TLP

[garanews]

Request Type

Add TLP support when exporting cases to MISP

Problem Description

When exporting cases to MISP the TLPs set in The Hive (over the case and the attributes) are not replicated in MISP.
MISP supports the TLP through the Taxonomy Library: tlp
That contains the unique values:

Steps to Reproduce

Send a case to MISP

Possible Solutions

Through the function get_tags(misp) from pymisp is possible to retrieve the tag id needed for set the tlp in MISP

It should be possible obtain the id also through the REST API accessing to
/tags/index.json

so to /tags/index
post {"filter":"tlp:red"}
will get back the tlp:red matching tags ( thanks @iglocska )