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#!/usr/bin/env python3 |
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from __future__ import print_function |
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import re |
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import sys |
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import argparse |
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import os |
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import ssg |
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import ssg.xml |
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import xml.dom.minidom |
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ET = ssg.xml.ElementTree |
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owner = "disastig" |
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stig_ns = ["https://public.cyber.mil/stigs/downloads/?_dl_facet_stigs=operating-systems%2Cunix-linux", |
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"https://public.cyber.mil/stigs/downloads/?_dl_facet_stigs=operating-systems%2Cgeneral-purpose-os", |
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"https://public.cyber.mil/stigs/downloads/?_dl_facet_stigs=app-security%2Capplication-servers", |
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"https://public.cyber.mil/stigs/downloads/?_dl_facet_stigs=app-security%2Capp-security-dev"] |
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xccdf_ns = "http://checklists.nist.gov/xccdf/1.1" |
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dc_ns = "http://purl.org/dc/elements/1.1/" |
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outfile = "stig_overlay.xml" |
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def yes_no_prompt(): |
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prompt = "Would you like to proceed? (Y/N): " |
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while True: |
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data = str(raw_input(prompt)).lower() |
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if data in ("yes", "y"): |
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return True |
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elif data in ("n", "no"): |
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return False |
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def element_value(element, element_obj): |
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for elem in element_obj.findall("./{%s}%s" % (xccdf_ns, element)): |
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elem = elem.text |
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try: |
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return elem |
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except UnboundLocalError as e: |
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return "" |
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def ssg_xccdf_stigid_mapping(ssgtree): |
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xccdftostig_idmapping = {} |
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for rule in ssgtree.findall(".//{%s}Rule" % xccdf_ns): |
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srgs = [] |
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rhid = "" |
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xccdfid = rule.get("id") |
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if xccdfid is not None: |
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for references in stig_ns: |
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stig = [ids for ids in rule.findall(".//{%s}reference[@href='%s']" % (xccdf_ns, references))] |
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for ref in reversed(stig): |
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if not ref.text.startswith("SRG-"): |
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rhid = ref.text |
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else: |
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srgs.append(ref.text) |
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xccdftostig_idmapping.update({rhid: {xccdfid: srgs}}) |
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return xccdftostig_idmapping |
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def getkey(elem): |
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return elem.get("ownerid") |
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def new_stig_overlay(xccdftree, ssgtree, outfile, quiet): |
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if not ssgtree: |
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ssg_mapping = False |
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else: |
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ssg_mapping = ssg_xccdf_stigid_mapping(ssgtree) |
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new_stig_overlay = ET.Element("overlays", xmlns=xccdf_ns) |
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for group in xccdftree.findall("./{%s}Group" % xccdf_ns): |
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vkey = group.get("id").strip('V-') |
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for title in group.findall("./{%s}title" % xccdf_ns): |
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srg = title.text |
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for rule in group.findall("./{%s}Rule" % xccdf_ns): |
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svkey_raw = rule.get("id") |
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svkey = svkey_raw.strip()[3:9] |
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severity = rule.get("severity") |
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release = svkey_raw.strip()[10:-5] |
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version = element_value("version", rule) |
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rule_title = element_value("title", rule) |
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ident = element_value("ident", rule).strip("CCI-").lstrip("0") |
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if not ssgtree: |
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mapped_id = "XXXX" |
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else: |
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try: |
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mapped_id = ''.join(ssg_mapping[version].keys()) |
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except KeyError as e: |
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mapped_id = "XXXX" |
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overlay = ET.SubElement(new_stig_overlay, "overlay", owner=owner, |
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ruleid=mapped_id, ownerid=version, disa=ident, |
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severity=severity) |
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vmsinfo = ET.SubElement(overlay, "VMSinfo", VKey=vkey, |
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SVKey=svkey, VRelease=release) |
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title = ET.SubElement(overlay, "title", text=rule_title) |
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lines = new_stig_overlay.findall("overlay") |
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new_stig_overlay[:] = sorted(lines, key=getkey) |
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dom = xml.dom.minidom.parseString(ET.tostring(new_stig_overlay, encoding="UTF-8", xml_declaration=True)) |
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pretty_xml_as_string = dom.toprettyxml(indent=' ', encoding="UTF-8") |
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overlay_directory = os.path.dirname(outfile) |
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if not os.path.exists(overlay_directory): |
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os.makedirs(overlay_directory) |
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if not quiet: |
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print("\nOverlay directory created: %s" % overlay_directory) |
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with open(outfile, 'wb') as f: |
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f.write(pretty_xml_as_string) |
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if not quiet: |
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print("\nGenerated the new STIG overlay file: %s" % outfile) |
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def parse_args(): |
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parser = argparse.ArgumentParser() |
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parser.add_argument("--disa-xccdf", default=False, required=True, |
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action="store", dest="disa_xccdf_filename", |
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help="A DISA generated XCCDF Manual checks file. \ |
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For example: disa-stig-rhel8-v1r12-xccdf-manual.xml") |
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parser.add_argument("--ssg-xccdf", default=None, |
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action="store", dest="ssg_xccdf_filename", |
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help="A SSG generated XCCDF file. \ |
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For example: ssg-rhel8-xccdf.xml") |
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parser.add_argument("-o", "--output", default=outfile, |
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action="store", dest="output_file", |
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help="STIG overlay XML content file \ |
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[default: %default]") |
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parser.add_argument("-q", "--quiet", dest="quiet", default=False, |
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action="store_true", help="Do not print anything and assume yes for everything") |
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return parser.parse_args() |
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def main(): |
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args = parse_args() |
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disa_xccdftree = ET.parse(args.disa_xccdf_filename) |
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if not args.ssg_xccdf_filename: |
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prompt = True |
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if not args.quiet: |
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print("WARNING: You are generating a STIG overlay XML file without mapping it " |
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"to existing SSG content.") |
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prompt = yes_no_prompt() |
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if not prompt: |
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sys.exit(0) |
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ssg_xccdftree = False |
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else: |
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ssg_xccdftree = ET.parse(args.ssg_xccdf_filename) |
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ssg = ssg_xccdftree.find(".//{%s}publisher" % dc_ns).text |
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if ssg != "SCAP Security Guide Project": |
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if not args.quiet: |
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sys.exit("%s is not a valid SSG generated XCCDF file." % args.ssg_xccdf_filename) |
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else: |
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sys.exit(1) |
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disa = disa_xccdftree.find(".//{%s}source" % dc_ns).text |
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if disa != "STIG.DOD.MIL": |
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if not args.quiet: |
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sys.exit("%s is not a valid DISA generated manual XCCDF file." % args.disa_xccdf_filename) |
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else: |
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sys.exit(2) |
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new_stig_overlay(disa_xccdftree, ssg_xccdftree, args.output_file, args.quiet) |
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if __name__ == "__main__": |
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main() |
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ComplianceAsCode /
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