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3f0808e9f9
- Major updates to README.md and docs/README.md for Pulse v5 - Added technical deep-dives for Pulse Pro (docs/PULSE_PRO.md) and AI Patrol (docs/AI.md) - Updated Prometheus metrics documentation and Helm schema for metrics separation - Refreshed security, installation, and deployment documentation for unified agent models - Cleaned up legacy summary files
35 lines
1.6 KiB
Markdown
35 lines
1.6 KiB
Markdown
# Agent Security
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Pulse agents incorporate several security mechanisms to ensure that the code running on your infrastructure is authentic and untampered with.
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## Self-Update Security
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The agent's self-update mechanism is critical for security and stability. To prevent supply chain attacks or compromised update servers from distributing malicious or broken agents, Pulse employs a rigorous verification process.
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### 1. Checksum Verification
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The agent verifies a SHA-256 checksum of the downloaded binary. The server must provide
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`X-Checksum-Sha256`; updates are rejected if the header is missing or mismatched.
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### 2. Signature Verification (Optional)
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The legacy Docker agent supports optional Ed25519 signature verification when the server provides `X-Signature-Ed25519`. The unified agent relies on checksum verification only. Missing signatures are logged as a warning where supported.
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### 3. Pre-Flight Checks
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To prevent "brick-updates"—bad updates that crash immediately and require manual recovery—agents perform pre-flight validation before replacing the running executable.
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Unified agent (`pulse-agent`):
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1. Download new binary.
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2. Verify checksum (required).
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3. Validate binary magic (ELF/Mach-O/PE) and size limits (100MB max).
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4. Make executable and swap atomically.
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Legacy Docker agent (`pulse-docker-agent`):
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1. Download new binary.
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2. Verify checksum (required).
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3. Make executable.
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4. **Execute with `--self-test`** to validate startup.
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5. If the self-test fails, the update is aborted.
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## API Security
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- **Token Authentication**: All agent-to-server communication requires a valid API token.
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- **TLS**: Encrypted by default (unless specifically disabled).
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