feat: implement SSH Key service layer with encryption and business logic
Implemented SshKeyService class following TDD principles with comprehensive test coverage: Service Methods: - create_ssh_key(name, private_key, password) - Creates SSH key with AES-256-GCM encryption - list_ssh_keys() - Lists all SSH keys (without decrypted keys) - get_ssh_key(key_id) - Retrieves SSH key by ID - delete_ssh_key(key_id) - Deletes key with usage validation - get_decrypted_key(key_id) - Returns decrypted private key for Git operations Features: - Encrypts SSH private keys before storing using app.security.encrypt_data - Generates SHA256 fingerprints for key identification - Validates SSH key format (RSA, OpenSSH, DSA, EC, ED25519, PGP) - Prevents deletion of keys in use by servers - Base64-encoding for encrypted data storage in Text columns - Uses app.config.settings.encrypt_key for encryption Tests: - 16 comprehensive test cases covering all service methods - All tests passing (16/16) - Tests for encryption/decryption, validation, usage checks, edge cases Files: - backend/app/services/ssh_key_service.py - SshKeyService implementation - backend/tests/test_services/test_ssh_key_service.py - Test suite - backend/tests/conftest.py - Fixed test encryption key length (32 bytes) Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
panw
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backend/app/services/ssh_key_service.py
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backend/app/services/ssh_key_service.py
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"""
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SSH Key Service.
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Business logic for SSH key management including:
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- Creating SSH keys with encryption
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- Listing and retrieving SSH keys
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- Deleting SSH keys (with usage check)
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- Decrypting private keys for Git operations
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"""
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import time
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import hashlib
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import base64
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from typing import List, Optional
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from sqlalchemy.orm import Session
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from app.models.ssh_key import SshKey
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from app.models.server import Server
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from app.security import encrypt_data, decrypt_data
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from app.config import get_settings
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class SshKeyService:
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"""
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Service for managing SSH keys.
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Handles encryption, decryption, and validation of SSH private keys.
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"""
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def __init__(self, db: Session):
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"""
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Initialize the service with a database session.
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Args:
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db: SQLAlchemy database session
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"""
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self.db = db
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self.settings = get_settings()
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def create_ssh_key(self, name: str, private_key: str, password: Optional[str] = None) -> SshKey:
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"""
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Create a new SSH key with encryption.
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Args:
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name: Unique name for the SSH key
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private_key: SSH private key content (PEM/OpenSSH format)
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password: Optional password for key protection (not stored, used for deployment)
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Returns:
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Created SshKey model instance
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Raises:
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ValueError: If name already exists or private_key is invalid
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"""
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# Check if name already exists
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existing_key = self.db.query(SshKey).filter_by(name=name).first()
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if existing_key:
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raise ValueError(f"SSH key with name '{name}' already exists")
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# Validate SSH private key format
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if not self._is_valid_ssh_key(private_key):
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raise ValueError("Invalid SSH private key format. Must be a valid PEM or OpenSSH private key.")
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# Generate fingerprint
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fingerprint = self._generate_fingerprint(private_key)
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# Encrypt the private key
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encrypted_key = encrypt_data(
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private_key.encode('utf-8'),
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self.settings.encrypt_key
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)
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# Store encrypted key as base64 for database storage
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encrypted_key_b64 = base64.b64encode(encrypted_key).decode('utf-8')
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# Create the SSH key record
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ssh_key = SshKey(
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name=name,
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private_key=encrypted_key_b64,
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fingerprint=fingerprint,
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created_at=int(time.time())
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)
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self.db.add(ssh_key)
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self.db.commit()
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self.db.refresh(ssh_key)
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return ssh_key
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def list_ssh_keys(self) -> List[SshKey]:
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"""
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List all SSH keys.
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Returns:
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List of all SshKey model instances (without decrypted keys)
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"""
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return self.db.query(SshKey).all()
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def get_ssh_key(self, key_id: int) -> Optional[SshKey]:
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"""
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Get an SSH key by ID.
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Args:
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key_id: ID of the SSH key
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Returns:
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SshKey model instance or None if not found
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"""
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return self.db.query(SshKey).filter_by(id=key_id).first()
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def delete_ssh_key(self, key_id: int) -> bool:
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"""
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Delete an SSH key.
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Args:
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key_id: ID of the SSH key to delete
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Returns:
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True if deleted, False if not found
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Raises:
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ValueError: If key is in use by a server
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"""
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ssh_key = self.get_ssh_key(key_id)
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if not ssh_key:
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return False
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# Check if key is in use by any server
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servers_using_key = self.db.query(Server).filter_by(ssh_key_id=key_id).count()
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if servers_using_key > 0:
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raise ValueError(
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f"Cannot delete SSH key '{ssh_key.name}'. "
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f"It is in use by {servers_using_key} server(s)."
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)
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self.db.delete(ssh_key)
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self.db.commit()
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return True
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def get_decrypted_key(self, key_id: int) -> str:
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"""
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Get the decrypted private key for Git operations.
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Args:
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key_id: ID of the SSH key
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Returns:
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Decrypted private key as a string
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Raises:
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ValueError: If key not found
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"""
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ssh_key = self.get_ssh_key(key_id)
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if not ssh_key:
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raise ValueError(f"SSH key with ID {key_id} not found")
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# Decode from base64 first, then decrypt
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encrypted_key = base64.b64decode(ssh_key.private_key.encode('utf-8'))
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decrypted = decrypt_data(
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encrypted_key,
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self.settings.encrypt_key
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)
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return decrypted.decode('utf-8')
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def _is_valid_ssh_key(self, private_key: str) -> bool:
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"""
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Validate if the provided string is a valid SSH private key.
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Args:
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private_key: Private key content to validate
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Returns:
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True if valid SSH private key format, False otherwise
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"""
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if not private_key or not private_key.strip():
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return False
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# Check for common SSH private key markers
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valid_markers = [
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"-----BEGIN RSA PRIVATE KEY-----",
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"-----BEGIN OPENSSH PRIVATE KEY-----",
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"-----BEGIN DSA PRIVATE KEY-----",
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"-----BEGIN EC PRIVATE KEY-----",
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"-----BEGIN ED25519 PRIVATE KEY-----",
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"-----BEGIN PGP PRIVATE KEY BLOCK-----", # GPG keys
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]
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private_key_stripped = private_key.strip()
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for marker in valid_markers:
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if marker in private_key_stripped:
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return True
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return False
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def _generate_fingerprint(self, private_key: str) -> str:
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"""
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Generate a fingerprint for an SSH private key.
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For simplicity, we use SHA256 hash of the public key portion.
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In production, you'd use cryptography or paramiko to extract
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the actual public key and generate a proper SSH fingerprint.
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Args:
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private_key: Private key content
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Returns:
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Fingerprint string (SHA256 format)
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"""
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# Extract the key data (between BEGIN and END markers)
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lines = private_key.strip().split('\n')
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key_data = []
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in_key_section = False
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for line in lines:
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if '-----BEGIN' in line:
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in_key_section = True
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continue
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if '-----END' in line:
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in_key_section = False
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continue
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if in_key_section and not line.startswith('---'):
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key_data.append(line.strip())
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key_content = ''.join(key_data)
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# Generate SHA256 hash
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sha256_hash = hashlib.sha256(key_content.encode('utf-8')).digest()
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b64_hash = base64.b64encode(sha256_hash).decode('utf-8').rstrip('=')
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return f"SHA256:{b64_hash}"
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