Add support for MITRE ATT&CK

addons/addons.typ

@@ -1,3 +1,4 @@
 #import "cia.typ"
 #import "cvss.typ"
+#import "mitre.typ"
 #import "tlp.typ"

addons/mitre.typ

@@ -0,0 +1,15 @@
+#let isUsed = state("mitreIsUsed", false)
+#let mitreData = json("../extern/mitre-attack.json")
+
+#let reference(name: str, id: str) = {
+  let elem = mitreData.find(d => d.name == name or d.id == id)
+  if elem == none {
+    panic("Referenced MITRE ATT&CK attack pattern, but it couldn't be found: id=" + str(id) + ", name=" + str(name))
+  }
+
+  text([
+    _#elem.name _ (#elem.id)#footnote(elem.url)
+  ])
+
+  context(isUsed.update(true))
+}