mirror of
https://github.com/mukul975/Anthropic-Cybersecurity-Skills.git
synced 2026-06-11 21:54:56 +03:00
mukul975
313 lines
11 KiB
Python
313 lines
11 KiB
Python
#!/usr/bin/env python3
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"""Content Security Policy (CSP) analysis and bypass testing agent.
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Fetches and analyzes CSP headers from web applications to identify
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misconfigurations, overly permissive directives, and potential bypass
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vectors. Tests for unsafe-inline, unsafe-eval, wildcard sources,
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missing directives, and known CSP bypass patterns.
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AUTHORIZED TESTING ONLY: Only use against targets you have explicit
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written permission to test.
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"""
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import argparse
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import json
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import re
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import sys
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from datetime import datetime, timezone
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try:
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import requests
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except ImportError:
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print("[!] 'requests' library required: pip install requests", file=sys.stderr)
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sys.exit(1)
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CSP_DIRECTIVES = [
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"default-src", "script-src", "style-src", "img-src", "font-src",
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"connect-src", "media-src", "object-src", "frame-src", "child-src",
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"worker-src", "frame-ancestors", "form-action", "base-uri",
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"manifest-src", "prefetch-src", "navigate-to",
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]
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def fetch_csp(url, headers=None, cookies=None):
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"""Fetch CSP header(s) from a URL."""
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print(f"[*] Fetching CSP from {url}")
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h = headers or {}
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c = cookies or {}
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resp = requests.get(url, headers=h, cookies=c, timeout=15, allow_redirects=True)
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csp_header = resp.headers.get("Content-Security-Policy", "")
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csp_ro = resp.headers.get("Content-Security-Policy-Report-Only", "")
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print(f"[+] Status: {resp.status_code}")
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if csp_header:
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print(f"[+] CSP header found ({len(csp_header)} chars)")
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else:
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print("[!] No CSP header found")
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if csp_ro:
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print(f"[+] CSP-Report-Only header found ({len(csp_ro)} chars)")
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return csp_header, csp_ro, resp.status_code
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def parse_csp(csp_string):
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"""Parse a CSP string into a structured dict."""
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directives = {}
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if not csp_string:
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return directives
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for part in csp_string.split(";"):
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part = part.strip()
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if not part:
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continue
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tokens = part.split()
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if tokens:
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directive_name = tokens[0].lower()
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values = tokens[1:] if len(tokens) > 1 else []
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directives[directive_name] = values
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return directives
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def analyze_csp(directives, csp_string):
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"""Analyze CSP directives for security weaknesses."""
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findings = []
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# Missing CSP entirely
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if not directives:
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findings.append({
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"check": "CSP Header Present",
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"severity": "HIGH",
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"status": "MISSING",
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"description": "No Content-Security-Policy header",
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"recommendation": "Implement a CSP header",
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})
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return findings
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# Check for missing critical directives
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if "default-src" not in directives:
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findings.append({
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"check": "default-src directive",
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"severity": "HIGH",
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"status": "MISSING",
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"description": "No default-src fallback directive",
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"recommendation": "Add default-src 'none' or default-src 'self'",
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})
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if "script-src" not in directives and "default-src" not in directives:
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findings.append({
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"check": "script-src directive",
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"severity": "CRITICAL",
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"status": "MISSING",
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"description": "No script-src or default-src; scripts unrestricted",
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})
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if "object-src" not in directives:
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findings.append({
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"check": "object-src directive",
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"severity": "MEDIUM",
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"status": "MISSING",
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"description": "Missing object-src; plugin-based XSS possible",
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"recommendation": "Add object-src 'none'",
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})
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if "base-uri" not in directives:
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findings.append({
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"check": "base-uri directive",
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"severity": "MEDIUM",
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"status": "MISSING",
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"description": "Missing base-uri; base tag injection possible",
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"recommendation": "Add base-uri 'self' or base-uri 'none'",
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})
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if "frame-ancestors" not in directives:
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findings.append({
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"check": "frame-ancestors directive",
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"severity": "MEDIUM",
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"status": "MISSING",
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"description": "Missing frame-ancestors; clickjacking possible",
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"recommendation": "Add frame-ancestors 'self'",
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})
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# Analyze each directive
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for directive, values in directives.items():
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values_str = " ".join(values)
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# unsafe-inline
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if "'unsafe-inline'" in values:
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sev = "CRITICAL" if directive in ("script-src", "default-src") else "MEDIUM"
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findings.append({
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"check": f"unsafe-inline in {directive}",
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"severity": sev,
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"status": "FAIL",
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"description": f"'unsafe-inline' allows inline scripts/styles in {directive}",
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"bypass": "Inject inline <script> or event handlers",
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})
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# unsafe-eval
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if "'unsafe-eval'" in values:
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findings.append({
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"check": f"unsafe-eval in {directive}",
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"severity": "CRITICAL" if directive in ("script-src", "default-src") else "HIGH",
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"status": "FAIL",
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"description": f"'unsafe-eval' allows eval() and similar in {directive}",
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"bypass": "Use eval(), Function(), setTimeout('string') for XSS",
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})
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# Wildcard sources
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if "*" in values:
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findings.append({
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"check": f"Wildcard (*) in {directive}",
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"severity": "HIGH",
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"status": "FAIL",
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"description": f"Wildcard source in {directive} allows loading from any origin",
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"bypass": "Host payload on any domain",
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})
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# data: URI
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if "data:" in values and directive in ("script-src", "default-src", "object-src"):
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findings.append({
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"check": f"data: URI in {directive}",
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"severity": "HIGH",
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"status": "FAIL",
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"description": f"data: URI in {directive} allows inline data execution",
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"bypass": "Use data:text/html payload or data:application/javascript",
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})
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# blob: URI
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if "blob:" in values and directive in ("script-src", "default-src", "worker-src"):
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findings.append({
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"check": f"blob: URI in {directive}",
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"severity": "MEDIUM",
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"status": "FAIL",
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"description": f"blob: URI in {directive} may allow bypass via Blob URLs",
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})
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# Known bypass CDNs
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bypass_cdns = ["cdn.jsdelivr.net", "cdnjs.cloudflare.com", "unpkg.com",
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"ajax.googleapis.com", "raw.githubusercontent.com"]
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for cdn in bypass_cdns:
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if cdn in values_str:
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findings.append({
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"check": f"Bypassable CDN in {directive}",
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"severity": "HIGH",
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"status": "FAIL",
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"description": f"{cdn} in {directive} can host arbitrary scripts",
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"bypass": f"Upload/find malicious script on {cdn}",
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})
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# http: in HTTPS context
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if any(v.startswith("http:") for v in values):
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findings.append({
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"check": f"HTTP source in {directive}",
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"severity": "MEDIUM",
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"status": "FAIL",
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"description": f"HTTP source allows MitM injection in {directive}",
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})
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return findings
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def format_summary(url, directives, findings, csp_string):
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"""Print analysis summary."""
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print(f"\n{'='*60}")
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print(f" CSP Analysis Report")
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print(f"{'='*60}")
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print(f" URL : {url}")
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print(f" Directives : {len(directives)}")
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print(f" Findings : {len(findings)}")
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severity_counts = {}
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for f in findings:
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sev = f.get("severity", "INFO")
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severity_counts[sev] = severity_counts.get(sev, 0) + 1
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print(f"\n By Severity:")
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for sev in ["CRITICAL", "HIGH", "MEDIUM", "LOW", "INFO"]:
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count = severity_counts.get(sev, 0)
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if count > 0:
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print(f" {sev:10s}: {count}")
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if directives:
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print(f"\n Parsed Directives:")
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for d, v in directives.items():
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print(f" {d:20s}: {' '.join(v)[:60]}")
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if findings:
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print(f"\n Security Issues:")
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for f in findings:
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if f["severity"] in ("CRITICAL", "HIGH"):
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bypass = f" | Bypass: {f['bypass']}" if f.get("bypass") else ""
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print(f" [{f['severity']:8s}] {f['check']}{bypass}")
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return severity_counts
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def main():
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parser = argparse.ArgumentParser(
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description="CSP analysis and bypass testing agent (authorized testing only)"
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)
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parser.add_argument("--url", required=True, help="Target URL to fetch CSP from")
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parser.add_argument("--csp-string", help="Analyze a CSP string directly instead of fetching")
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parser.add_argument("--header", nargs="+", help="Custom headers (key:value)")
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parser.add_argument("--cookie", help="Cookie string")
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parser.add_argument("--output", "-o", help="Output JSON report path")
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parser.add_argument("--verbose", "-v", action="store_true")
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args = parser.parse_args()
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if args.csp_string:
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csp_string = args.csp_string
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csp_ro = ""
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status_code = 0
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else:
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headers = {}
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if args.header:
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for h in args.header:
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k, v = h.split(":", 1)
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headers[k.strip()] = v.strip()
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cookies = {}
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if args.cookie:
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for pair in args.cookie.split(";"):
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if "=" in pair:
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k, v = pair.strip().split("=", 1)
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cookies[k] = v
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csp_string, csp_ro, status_code = fetch_csp(args.url, headers or None, cookies or None)
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directives = parse_csp(csp_string)
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findings = analyze_csp(directives, csp_string)
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if csp_ro:
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ro_directives = parse_csp(csp_ro)
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findings.append({
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"check": "CSP-Report-Only mode",
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"severity": "MEDIUM",
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"status": "WARN",
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"description": "CSP in report-only mode does not enforce restrictions",
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})
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severity_counts = format_summary(args.url, directives, findings, csp_string)
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report = {
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"timestamp": datetime.now(timezone.utc).isoformat(),
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"tool": "CSP Analyzer",
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"url": args.url,
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"csp_header": csp_string,
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"csp_report_only": csp_ro,
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"directives": {k: v for k, v in directives.items()},
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"findings": findings,
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"severity_counts": severity_counts,
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"risk_level": (
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"CRITICAL" if severity_counts.get("CRITICAL", 0) > 0
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else "HIGH" if severity_counts.get("HIGH", 0) > 0
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else "MEDIUM" if severity_counts.get("MEDIUM", 0) > 0
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else "LOW"
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),
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}
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if args.output:
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with open(args.output, "w") as f:
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json.dump(report, f, indent=2)
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print(f"\n[+] Report saved to {args.output}")
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elif args.verbose:
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print(json.dumps(report, indent=2))
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if __name__ == "__main__":
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main()
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