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- Add scripts/agent.py and references/api-reference.md to all remaining skills - Update all 648 LICENSE files: copyright now reads 'Mahipal' - Add implementing-security-monitoring-with-datadog (new skill with full anatomy) - All 649 skills now have: SKILL.md, LICENSE, scripts/agent.py, references/api-reference.md
48 lines
1.7 KiB
Markdown
48 lines
1.7 KiB
Markdown
# API Reference — Performing JWT None Algorithm Attack
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## Libraries Used
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- **base64**: Base64url encoding/decoding for JWT components
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- **hmac / hashlib**: HMAC-SHA256 signing for algorithm confusion attacks
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- **json**: JWT header/payload serialization
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- **requests** (optional): Test forged tokens against live endpoints
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## CLI Interface
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```
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python agent.py decode --token <jwt_string>
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python agent.py forge --token <jwt_string> [--claims '{"role":"admin"}']
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python agent.py confuse --token <jwt_string> [--pubkey public.pem]
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python agent.py test --url <api_endpoint> --token <original_jwt>
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```
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## Core Functions
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### `decode_jwt(token)` — Decode JWT without verification
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Returns header, payload, and vulnerability checks: alg=none, no expiry, expired, no issuer.
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### `forge_none_token(token, modify_claims)` — Create alg=none variants
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Generates 6 variants: `none`, `None`, `NONE`, `nOnE`, empty signature, no trailing dot.
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### `test_alg_confusion(token, public_key_file)` — Algorithm confusion attack
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Tests RS256-to-HS256 downgrade using RSA public key as HMAC secret.
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### `test_jwt_endpoint(url, original_token, forged_tokens)` — Validate against API
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Sends forged tokens to target endpoint. Reports CRITICAL if any variant accepted.
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## JWT None Variants Tested
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| Variant | Algorithm Header |
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|---------|-----------------|
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| alg_none | `"alg": "none"` |
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| alg_None | `"alg": "None"` |
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| alg_NONE | `"alg": "NONE"` |
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| alg_nOnE | `"alg": "nOnE"` |
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| empty_sig | No signature segment |
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## Severity Classification
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- **CRITICAL**: Any none-algorithm token accepted by server
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- **INFO**: All forged tokens rejected
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## Dependencies
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```
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pip install requests # optional, for endpoint testing
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```
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