255 lines
9.4 KiB
Python
255 lines
9.4 KiB
Python
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import bz2
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import datetime
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import re
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import requests
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from typing import Tuple, List, Dict, Any
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import xml.etree.ElementTree as ET
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import logging
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import json
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from .config import DOWNLOAD_DIR, NOT_BEFORE, RELEASES, SA_EXCLUDE, PACKAGES_EXCLUDE
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from .sa import SecurityAdvisory
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from .package import Package
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def download_oval(url: str) -> str:
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"""
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download_oval downloads, decompreses oval file
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and returns filepath of saved file
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"""
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r = requests.get(url, stream=True, timeout=30)
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decompressor = bz2.BZ2Decompressor()
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fname = url.split('/')[-1].replace('.bz2', '')
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fpath = DOWNLOAD_DIR / fname
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with open(fpath, 'wb') as fd:
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for chunk in r.iter_content(chunk_size=128):
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fd.write(decompressor.decompress(chunk))
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return fpath
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def download_errata(url: str, release_version: int) -> str:
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"""
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downloads errata_full.json file end returns file path
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"""
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response = requests.get(url, stream=True, timeout=30)
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fname = f'alma-{release_version}.json'
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fpath = DOWNLOAD_DIR / fname
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with open(fpath, 'wb') as errata_file:
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for chunk in response.iter_content(chunk_size=128):
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errata_file.write(chunk)
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return fpath
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def parse_oval(fpath: str) -> Dict[str, SecurityAdvisory]:
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"""
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converting oval xml file to dict
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"""
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def extract_package(title: str) -> Package:
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r = r'(.*) is earlier than \d+:(.+?(?=-))'
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res = re.search(r, title)
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name = res.group(1)
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version = res.group(2)
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return Package(name=name, version=version)
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def extract_id(title: str) -> str:
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r = r'[RH|AL]SA-(\d{4}:\d+)(.*)'
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res = re.search(r, title)
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return res.group(1)
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tree = ET.parse(fpath)
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root = tree.getroot()
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ns = {
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'n': 'http://oval.mitre.org/XMLSchema/oval-definitions-5',
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}
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res = {}
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for definition in root.findall('n:definitions/', ns):
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title = definition.find('n:metadata/n:title', ns).text
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issued = definition.find(
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'n:metadata/n:advisory/n:issued', ns).attrib['date']
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issued_dt = datetime.datetime.strptime(issued, "%Y-%m-%d")
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# we are only interesed in Security advisories after RHEL 8.3
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if ('RHSA' not in title and 'ALSA' not in title) or issued_dt < NOT_BEFORE:
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continue
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sa_id = extract_id(title)
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packages = [extract_package(i.attrib['comment']) for i in definition.findall(".//n:criterion", ns)
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if 'is earlier than' in i.attrib['comment']]
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res[sa_id] = SecurityAdvisory(
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title=title, id=sa_id, packages=packages)
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return res
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def parse_errata(fpath: str) -> Dict[str, SecurityAdvisory]:
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"""
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parses alma errata file and converts it to dict of SA instances
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"""
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with open(fpath, 'r', encoding='utf-8') as file_to_load:
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erratas = json.load(file_to_load)
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res = {}
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for errata in erratas['data']:
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title = errata['title']
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sa_id = errata['id'].split('-')[-1]
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packages = []
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for package in errata['packages']:
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full_name = f"{package['name']}-{package['version']}"
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if full_name not in packages:
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packages.append(full_name)
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packages.sort()
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res[sa_id] = SecurityAdvisory(
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title=title, id=sa_id, packages=packages)
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return res
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def compare(rhel_oval: Dict[str, SecurityAdvisory],
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alma_oval: Dict[str, SecurityAdvisory],
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alma_errata: Dict[str, SecurityAdvisory]) -> Tuple[dict, list]:
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"""
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compares rhel oval with alma oval and alma errata
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"""
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diff = []
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report = {
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# total amount of security advisories
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'total_sa_count': 0,
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# amount of SA that match with rhel
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'good_sa_count': 0,
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# total amount of differencies
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'diff_count': 0,
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# list of SA excluded from diff check
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'excluded_sa': [],
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# list of packages excluded from diff check
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'excluded_pkg': [],
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# amount of oval SA that dont exists in oval file
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'oval_missing_sa_count': 0,
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# amount of oval SA that have missing packages
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'oval_missing_pkg_sa_count': 0,
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# list of missing oval SA
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'oval_missing_sa': [],
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# list of oval SA that have missing packages
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'oval_missing_pkg_sa': [],
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# amount of SA that dont exists in errata file
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'errata_missing_sa_count': 0,
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# amount of errata SA that have missing packages
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'errata_missing_pkg_sa_count': 0,
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# list of SA that are missing in errata file
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'errata_missing_sa': [],
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# list of errata SA with missing packages
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'errata_missing_pkg_sa': [],
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# total amount of unique missing packages across all alma SA
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'missing_packages_unique_count': 0,
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# list of unique packages that missing across all alma SA
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'missing_packages_unique': []
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}
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for rhel_sa_id, rhel_sa in rhel_oval.items():
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report['total_sa_count'] += 1
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sa_name = f'ALSA-{rhel_sa_id}'
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# filtering out SA
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if sa_name in SA_EXCLUDE:
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report['excluded_sa'].append(sa_name)
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continue
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# filtefing out packages
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packages_to_check: List[Package] = []
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for p in rhel_sa.packages:
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if any(p.name == i for i in PACKAGES_EXCLUDE):
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if str(p) not in report['excluded_pkg']:
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report['excluded_pkg'].append(str(p))
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else:
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packages_to_check.append(p)
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# check oval
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try:
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alma_oval_sa = alma_oval[rhel_sa_id]
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except KeyError:
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report['diff_count'] += 1
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diff.append({'sa_name': sa_name, 'diff': 'SA is missing in oval'})
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report['oval_missing_sa'].append(sa_name)
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report['oval_missing_sa_count'] += 1
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else:
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# check if some packages are missing from oval SA
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alma_oval_packages = alma_oval_sa.packages
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alma_oval_missing_packages = [str(r) for r in packages_to_check
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if r not in alma_oval_packages]
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if alma_oval_missing_packages:
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report['diff_count'] += 1
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diff.append({'sa_name': sa_name,
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'diff': f"missing packages in oval SA: {','.join(alma_oval_missing_packages)}"})
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report['oval_missing_pkg_sa'].append(sa_name)
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report['oval_missing_pkg_sa_count'] += 1
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for mp in alma_oval_missing_packages:
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if mp not in report['missing_packages_unique']:
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report['missing_packages_unique'].append(mp)
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report['missing_packages_unique_count'] += 1
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# check errata
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try:
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alma_errata_sa = alma_errata[rhel_sa_id]
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except KeyError:
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report['errata_missing_sa'].append(sa_name)
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report['errata_missing_sa_count'] += 1
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report['diff_count'] += 1
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diff.append(
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{'sa_name': sa_name, 'diff': 'SA is missing in errata'})
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continue
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# check if some packages are missing from errata SA
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alma_errata_packages = alma_errata_sa.packages
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alma_errata_missing_packages = [
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str(r) for r in packages_to_check if r not in alma_errata_packages]
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if alma_errata_missing_packages:
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report['diff_count'] += 1
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diff.append({'sa_name': sa_name,
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'diff': f"missing packages in errata SA: {','.join(alma_errata_missing_packages)}"})
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report['errata_missing_pkg_sa'].append(sa_name)
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report['errata_missing_pkg_sa_count'] += 1
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for mp in alma_errata_missing_packages:
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if mp not in report['missing_packages_unique']:
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report['missing_packages_unique'].append(mp)
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report['missing_packages_unique_count'] += 1
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else:
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# if we here, all checks were passed
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report['good_sa_count'] += 1
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for item in report.values():
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if isinstance(item, list):
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item.sort()
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return report, diff
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# starting point
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def comparer_run() -> Dict[str, Any]:
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result = {}
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for release, urls in RELEASES.items():
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logging.info('Processing release %i', release)
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logging.info('downloading rhel oval')
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rhel_file = download_oval(urls['rhel_oval_url'])
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logging.info('parsing rhel oval')
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rhel_oval_dict = parse_oval(rhel_file)
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logging.info('downloading alma oval')
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alma_oval_file = download_oval(urls['alma_oval_url'])
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logging.info('parsing alma oval')
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alma_oval_dict = parse_oval(alma_oval_file)
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logging.info('downloading alma errata')
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alma_errata_file = download_errata(urls['alma_errata_url'], release)
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logging.info('parsing alma errata')
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alma_errata_dict = parse_errata(alma_errata_file)
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logging.info('comparing rhel and alma')
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report_release, diff_release = compare(
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rhel_oval_dict, alma_oval_dict, alma_errata_dict)
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result[release] = {'report': report_release,
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'diff': diff_release,
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'rhel_oval_url': urls['rhel_oval_url'],
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'alma_oval_url': urls['alma_oval_url'],
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'alma_errata_url': urls['alma_errata_url']}
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result['report_generated'] = datetime.datetime.now().timestamp() * 1000
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result['sa_not_before'] = NOT_BEFORE.timestamp() * 1000
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return result
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