Implementing Automated Remediation
Implementing Automated Remediation
Automated remediation accelerates the fix process while maintaining consistency:
#!/usr/bin/env python3
# automated-remediation.py
import os
import re
import subprocess
import tempfile
from typing import Dict, List, Optional
import docker
import git
class AutomatedRemediator:
def __init__(self, registry_url: str, git_repo: str):
self.registry_url = registry_url
self.git_repo = git_repo
self.docker_client = docker.from_env()
def remediate_base_image(self, image_name: str, vulnerabilities: List[Dict]) -> Optional[str]:
"""Automatically update base image to fix vulnerabilities"""
# Analyze current image
current_base = self.extract_base_image(image_name)
# Find secure alternative
secure_base = self.find_secure_base_image(current_base, vulnerabilities)
if not secure_base:
return None
# Update Dockerfile
updated_dockerfile = self.update_dockerfile_base(image_name, secure_base)
# Build and test new image
new_image = self.build_and_test_image(updated_dockerfile, image_name)
if new_image:
# Create pull request
self.create_remediation_pr(image_name, current_base, secure_base)
return new_image
def extract_base_image(self, image_name: str) -> str:
"""Extract base image from Dockerfile"""
dockerfile_path = self.find_dockerfile(image_name)
with open(dockerfile_path, 'r') as f:
content = f.read()
# Extract FROM statement
match = re.search(r'^FROM\s+(\S+)', content, re.MULTILINE)
if match:
return match.group(1)
return None
def find_secure_base_image(self, current_base: str, vulnerabilities: List[Dict]) -> Optional[str]:
"""Find a secure alternative base image"""
# Parse current base image
parts = current_base.split(':')
image_name = parts[0]
current_tag = parts[1] if len(parts) > 1 else 'latest'
# Get available tags
available_tags = self.get_available_tags(image_name)
# Test each tag for vulnerabilities
secure_options = []
for tag in available_tags:
test_image = f"{image_name}:{tag}"
# Skip if older than current
if self.is_older_version(tag, current_tag):
continue
# Scan potential replacement
scan_result = self.scan_image(test_image)
# Check if it fixes our vulnerabilities
if self.fixes_vulnerabilities(scan_result, vulnerabilities):
secure_options.append({
'image': test_image,
'vulnerabilities': len(scan_result.get('vulnerabilities', [])),
'size': self.get_image_size(test_image)
})
# Choose best option (least vulnerabilities, smallest size)
if secure_options:
best_option = min(
secure_options,
key=lambda x: (x['vulnerabilities'], x['size'])
)
return best_option['image']
return None
def remediate_package_vulnerabilities(self, image_name: str, vulnerabilities: List[Dict]) -> Optional[str]:
"""Fix package vulnerabilities through updates"""
# Group vulnerabilities by package manager
grouped_vulns = self.group_by_package_manager(vulnerabilities)
# Generate update commands
update_commands = []
for pkg_manager, vulns in grouped_vulns.items():
if pkg_manager == 'apt':
update_commands.extend(self.generate_apt_fixes(vulns))
elif pkg_manager == 'npm':
update_commands.extend(self.generate_npm_fixes(vulns))
elif pkg_manager == 'pip':
update_commands.extend(self.generate_pip_fixes(vulns))
elif pkg_manager == 'go':
update_commands.extend(self.generate_go_fixes(vulns))
if not update_commands:
return None
# Create remediation Dockerfile
remediation_dockerfile = self.create_remediation_dockerfile(
image_name, update_commands
)
# Build and test
new_image = self.build_and_test_image(remediation_dockerfile, image_name)
return new_image
def generate_apt_fixes(self, vulnerabilities: List[Dict]) -> List[str]:
"""Generate APT commands to fix vulnerabilities"""
commands = []
# Update package list
commands.append("apt-get update")
# Install fixed versions
packages_to_update = []
for vuln in vulnerabilities:
if vuln.get('fixed_version'):
package = vuln['package_name']
version = vuln['fixed_version']
packages_to_update.append(f"{package}={version}")
if packages_to_update:
commands.append(f"apt-get install -y {' '.join(packages_to_update)}")
# Clean up
commands.append("apt-get clean && rm -rf /var/lib/apt/lists/*")
return commands
def generate_npm_fixes(self, vulnerabilities: List[Dict]) -> List[str]:
"""Generate npm commands to fix vulnerabilities"""
commands = []
# Try automated fix first
commands.append("npm audit fix")
# Specific package updates
for vuln in vulnerabilities:
if vuln.get('fixed_version'):
package = vuln['package_name']
version = vuln['fixed_version']
commands.append(f"npm install {package}@{version}")
# Deduplicate
commands.append("npm dedupe")
return commands
def create_remediation_dockerfile(self, base_image: str, update_commands: List[str]) -> str:
"""Create Dockerfile for remediation"""
dockerfile_content = f"""
# Automated remediation for {base_image}
FROM {base_image} AS remediated
# Apply security updates
USER root
{chr(10).join(f'RUN {cmd}' for cmd in update_commands)}
# Return to original user
USER 1001
"""
# Save to temporary file
with tempfile.NamedTemporaryFile(mode='w', suffix='.dockerfile', delete=False) as f:
f.write(dockerfile_content)
return f.name
def build_and_test_image(self, dockerfile_path: str, original_image: str) -> Optional[str]:
"""Build and test remediated image"""
# Generate new image tag
new_tag = f"{original_image}-remediated-{datetime.now().strftime('%Y%m%d%H%M%S')}"
try:
# Build image
self.docker_client.images.build(
path=os.path.dirname(dockerfile_path),
dockerfile=os.path.basename(dockerfile_path),
tag=new_tag,
nocache=True
)
# Run basic tests
if self.test_image_functionality(new_tag, original_image):
# Scan to verify fixes
scan_result = self.scan_image(new_tag)
if self.verify_remediation(scan_result, original_image):
return new_tag
except Exception as e:
print(f"Build failed: {e}")
return None
def test_image_functionality(self, new_image: str, original_image: str) -> bool:
"""Test that remediated image maintains functionality"""
# Run basic smoke tests
tests = [
self.test_image_starts,
self.test_healthcheck_passes,
self.test_expected_files_exist,
self.test_network_connectivity
]
for test in tests:
if not test(new_image):
return False
return True
def create_remediation_pr(self, image_name: str, old_base: str, new_base: str):
"""Create pull request with remediation"""
# Clone repository
with tempfile.TemporaryDirectory() as tmpdir:
repo = git.Repo.clone_from(self.git_repo, tmpdir)
# Create branch
branch_name = f"security/fix-{image_name.replace('/', '-')}-{datetime.now().strftime('%Y%m%d')}"
repo.create_head(branch_name)
repo.heads[branch_name].checkout()
# Update Dockerfile
dockerfile_path = os.path.join(tmpdir, self.find_relative_dockerfile(image_name))
with open(dockerfile_path, 'r') as f:
content = f.read()
# Replace base image
updated_content = content.replace(f"FROM {old_base}", f"FROM {new_base}")
with open(dockerfile_path, 'w') as f:
f.write(updated_content)
# Commit changes
repo.index.add([dockerfile_path])
repo.index.commit(f"fix: Update base image for {image_name} to fix vulnerabilities\n\n- Previous: {old_base}\n- Updated: {new_base}")
# Push branch
origin = repo.remote('origin')
origin.push(branch_name)
# Create PR (using GitHub API as example)
self.create_github_pr(branch_name, image_name, old_base, new_base)