[Bug] OSError when generating SVG File using to_svg

[joshfrogers]

Expected Behavior

ToSvg Generates an SVG File from a layer

Actual Behavior

OSError when generating the SVG File

Traceback (most recent call last):
  File "/home/jrogers/wksp/project/src/project_file.py", line 279, in <module>
    test = GenerateMarkDown(
  File "/home/jrogers/wksp/project/src/project_file.py", line 74, in __init__
    self.generate_attack()
  File "/home/jrogers/wksp/project/src/project_file.py", line 262, in generate_attack
    attack_data.export_layer()
  File "/home/jrogers/wksp/project/src/attack_utils.py", line 76, in export_layer
    svg.to_svg(self.layer, filepath=os.path.join(self.output_path, 'enterprise-attack.svg'))
  File "/home/jrogers/anaconda3/envs/project/lib/python3.10/site-packages/mitreattack/navlayers/exporters/to_svg.py", line 464, in to_svg
    d = self.raw_handle.export(showName=sName, showID=sID, sort=sort, scores=scores,
  File "/home/jrogers/anaconda3/envs/project/lib/python3.10/site-packages/mitreattack/navlayers/exporters/svg_templates.py", line 262, in export
    d, presence, overlay = self._build_headers(lhandle.name, config, lhandle.domain,
  File "/home/jrogers/anaconda3/envs/project/lib/python3.10/site-packages/mitreattack/navlayers/exporters/svg_templates.py", line 90, in _build_headers
    g = SVG_HeaderBlock().build(height=header_height, width=header_width, label='about',
  File "/home/jrogers/anaconda3/envs/project/lib/python3.10/site-packages/mitreattack/navlayers/exporters/svg_objects.py", line 264, in build
    rect2 = HeaderRect(_getstringwidth(label, config.font, 12), _getstringheight(label, config.font, 12),
  File "/home/jrogers/anaconda3/envs/project/lib/python3.10/site-packages/mitreattack/navlayers/exporters/svg_objects.py", line 42, in _getstringwidth
    font = ImageFont.truetype('{}/fonts/{}.ttf'.format(os.path.sep.join(__file__.split(os.path.sep)[:-1]), font),
  File "/home/jrogers/anaconda3/envs/project/lib/python3.10/site-packages/PIL/ImageFont.py", line 878, in truetype
    return freetype(font)
  File "/home/jrogers/anaconda3/envs/project/lib/python3.10/site-packages/PIL/ImageFont.py", line 875, in freetype
    return FreeTypeFont(font, size, index, encoding, layout_engine)
  File "/home/jrogers/anaconda3/envs/project/lib/python3.10/site-packages/PIL/ImageFont.py", line 226, in __init__
    self.font = core.getfont(
OSError: cannot open resource

Steps to Reproduce the Problem

Requirements:

• Ubuntu 22.04

• Anaconda Python

  1. Install mitreattack-python as per README
  2. Attempt to export a layer using the to_svg function
  3. Get OSError

Possible Solution

• fonts folder appears to be missing from mitreattack/navlayers/exporters when installed using pip on an anaconda install (possibly on all installs)
• copy fonts folder from repo to mitreattack/navlayers/exporters

[william-vanschaik]

I encountered the same issue on MacOS 12.3.1 using pip install as specified in the README. I believe the suggested solution in the issue is correct. I cloned the repo locally and copied the fonts folder referenced in the original post over to the python install location. This fixed the issue and the SVG was exported successfully.

[infosecB]

I experienced the same issue on macOS 12.5.1 and the same workaround fixed. I have submitted PR #87 which includes a permanent fix.

[jondricek]

Thanks all for your contributions, especially @infosecB for PR #87 which I just accepted.

I just released the latest version of this library (1.6.2) to PyPI that has this addressed. I'll close the issue now, but welcome any further discussion if it acts up again.