Pieter
071ed083f7
feat: Implement per-client SSH key isolation
Resolves #14
Each client now gets a dedicated SSH key pair, ensuring that compromise
of one client server does not grant access to other client servers.
## Changes
### Infrastructure (OpenTofu)
- Replace shared `hcloud_ssh_key.default` with per-client `hcloud_ssh_key.client`
- Each client key read from `keys/ssh/<client_name>.pub`
- Server recreated with new key (dev server only, acceptable downtime)
### Key Management
- Created `keys/ssh/` directory for SSH keys
- Added `.gitignore` to protect private keys from git
- Generated ED25519 key pair for dev client
- Private key gitignored, public key committed
### Scripts
- **`scripts/generate-client-keys.sh`** - Generate SSH key pairs for clients
- Updated `scripts/deploy-client.sh` to check for client SSH key
### Documentation
- **`docs/ssh-key-management.md`** - Complete SSH key management guide
- **`keys/ssh/README.md`** - Quick reference for SSH keys directory
### Configuration
- Removed `ssh_public_key` variable from `variables.tf`
- Updated `terraform.tfvars` to remove shared SSH key reference
- Updated `terraform.tfvars.example` with new key generation instructions
## Security Improvements
✅ Client isolation: Each client has dedicated SSH key
✅ Granular rotation: Rotate keys per-client without affecting others
✅ Defense in depth: Minimize blast radius of key compromise
✅ Proper key storage: Private keys gitignored, backups documented
## Testing
- ✅ Generated new SSH key for dev client
- ✅ Applied OpenTofu changes (server recreated)
- ✅ Tested SSH access: `ssh -i keys/ssh/dev root@78.47.191.38`
- ✅ Verified key isolation: Old shared key removed from Hetzner
## Migration Notes
For existing clients:
1. Generate key: `./scripts/generate-client-keys.sh <client>`
2. Apply OpenTofu: `cd tofu && tofu apply` (will recreate server)
3. Deploy: `./scripts/deploy-client.sh <client>`
For new clients:
1. Generate key first
2. Deploy as normal
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude <noreply@anthropic.com>