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c47eed6a64
- Fix 25 shell=True subprocess calls with list-based commands - Fix 49 verify=False in defensive skills (env-var override) - Add timeout to 231 HTTP/subprocess/socket calls - Fix 6 SQL injection patterns with whitelist validation - Replace 8 __import__() with standard imports - Remove 701 unused imports across 442 files - Add authorized-testing disclaimers to all offensive skills - Complete 11 incomplete skill directories - Expand 10 stub SKILL.md files with full content - Fix 2 YAML parse errors in frontmatter - Fix 5 pre-existing syntax errors - Convert 22 hardcoded paths/ports to environment variables - Back up 21 redundant skill pairs to .bak - Fix 2 global declaration errors - 724/724 skills with full folder anatomy (SKILL.md + agent.py + api-reference.md + LICENSE) - 0 compile errors across all 724 agent.py files
43 lines
1.6 KiB
Markdown
43 lines
1.6 KiB
Markdown
---
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name: implementing-log-integrity-with-blockchain
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description: >-
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Build an append-only log integrity chain using SHA-256 hash chaining for tamper detection.
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Each log entry is hashed with the previous entry's hash to create a blockchain-like structure
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where modifying any entry invalidates all subsequent hashes. Implements log ingestion,
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chain verification, tamper detection with pinpoint identification, and periodic checkpoint
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anchoring to external timestamping services.
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domain: cybersecurity
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subdomain: security-operations
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tags: [implementing, log, integrity, with]
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version: "1.0"
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author: mahipal
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license: Apache-2.0
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---
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# Implementing Log Integrity with Blockchain
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## Instructions
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1. Install dependencies: `pip install requests`
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2. Ingest log entries from syslog, JSON, or plain text files.
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3. For each entry, compute SHA-256 hash of: previous_hash + timestamp + log_content.
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4. Store the chain as a JSON ledger with entry index, timestamp, content hash, previous hash, and chain hash.
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5. Verify chain integrity by recomputing all hashes and detecting breaks.
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6. Optionally anchor checkpoint hashes to an external timestamping service.
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```bash
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python scripts/agent.py --log-file /var/log/syslog --chain-file log_chain.json --verify --output integrity_report.json
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```
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## Examples
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### Chain Entry Structure
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```json
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{"index": 42, "timestamp": "2024-01-15T10:30:00Z", "content_hash": "a1b2c3...",
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"prev_hash": "d4e5f6...", "chain_hash": "SHA256(prev_hash + timestamp + content_hash)"}
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```
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### Tamper Detection
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If entry 42 is modified, chain_hash[42] will not match SHA256(chain_hash[41] + ...), and all entries from 42 onward will be flagged as invalid.
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