Add file download tome

tavern/tomes/download/main.eldritch

@@ -0,0 +1,18 @@
+def download_file(remote_src, local_dst, insecure):
+    if file.is_dir(file.parent_dir(local_dst)):
+        if file.is_file(local_dst):
+            file.remove(local_dst)
+        http.download(remote_src, local_dst, insecure)
+    else:
+        eprint("Specified path has no parent directory")
+
+def main():
+    insecure = cast_bool()
+    if insecure == -1:
+        return
+
+    download_file(
+        input_params['url'],
+        input_params['dst'],
+        input_params['insecure'].lower() == "true"
+    )

tavern/tomes/download/metadata.yml

@@ -0,0 +1,18 @@
+name: Download
+description: Download a file
+author: hulto
+support_model: FIRST_PARTY
+tactic: EXECUTION
+paramdefs:
+- name: url
+  type: string
+  label: Remote file's URL
+  placeholder: "https://example.com/executable_file"
+- name: dst
+  type: string
+  label: Agent side file path (not directory)
+  placeholder: /tmp/my_file - C:\ProgramData\MyFile.txt
+- name: insecure
+  type: bool
+  label: Should TLS certificates be ignored
+  placeholder: "False"