tpm-password-integration.md
1 # TPM Password Int123 2 test123 3 egration 4 5 This document describes the TPM password integration feature in KeepSync, which adds an additional layer of security by requiring a master password for all TPM operations. 6 7 ## Overview 8 9 The TPM password integration wraps the TPM provider with a password protection layer that requires authentication before any TPM operations can be performed. This prevents unauthorized access to encryption keys even if the system is compromised. 10 11 Key features: 12 - Master password requirement for all TPM operations 13 - Secure token-based session management 14 - Configurable security levels 15 - Support for quantum-resistant cryptography 16 - PCR binding for system integrity verification 17 18 ## Implementation Details 19 20 The implementation consists of the following components: 21 22 1. **PasswordProtectedProvider**: A wrapper around the TPM provider that enforces password authentication before allowing any TPM operations. 23 24 2. **PasswordManager**: Manages the master password, authentication, and session tokens. 25 26 3. **Authentication Flow**: 27 - User is prompted for a master password during initialization 28 - If no password is set, the user is prompted to create one 29 - Password is verified against a stored hash 30 - Upon successful authentication, a session token is created 31 - All subsequent operations check for a valid session token 32 33 4. **Key Prefix System**: 34 - Keys managed by the password-protected provider are stored with a prefix 35 - This ensures separation between password-protected keys and other keys 36 - The prefix is transparent to the user 37 38 ## Hardware Requirements 39 40 To use the TPM password integration with real hardware, you need: 41 42 1. **TPM 2.0 Hardware**: 43 - A physical TPM 2.0 chip on your system 44 - Most modern laptops and desktops have TPM 2.0 chips 45 - You can check if your system has a TPM chip using: 46 ``` 47 ls -l /dev/tpm* 48 ``` 49 50 2. **Proper Permissions**: 51 - The TPM device is typically at `/dev/tpm0` or `/dev/tpmrm0` 52 - You need read/write access to this device 53 - Either run as root or add your user to the 'tss' group: 54 ``` 55 sudo usermod -a -G tss $USER 56 ``` 57 (requires logout/login to take effect) 58 59 3. **TPM Software Stack**: 60 - The TPM 2.0 software stack must be installed 61 - On Ubuntu/Debian: 62 ``` 63 sudo apt install tpm2-tools 64 ``` 65 - On Fedora/RHEL: 66 ``` 67 sudo dnf install tpm2-tools 68 ``` 69 70 ## Testing with Real Hardware 71 72 We've created a test script that verifies the TPM password integration with real hardware: 73 74 ```bash 75 ./test-scripts/run-tpm-password-real-test.sh 76 ``` 77 78 This test: 79 1. Creates a TPM service with password protection 80 2. Initializes the service (prompting for a password) 81 3. Generates a key 82 4. Lists keys to verify the key was created 83 5. Tests encryption and decryption 84 6. Gets key information 85 7. Cleans up by deleting the key 86 87 ### Troubleshooting 88 89 If you encounter issues running the test: 90 91 1. **Permission Denied**: 92 - Ensure you have proper permissions to access the TPM device 93 - Add your user to the 'tss' group and log out/in 94 - Try running the test with sudo 95 96 2. **No TPM Device Found**: 97 - Verify your system has a TPM 2.0 chip 98 - Check if the TPM is enabled in BIOS/UEFI 99 - Ensure the TPM device is not being used by another process 100 101 3. **Authentication Failures**: 102 - If you forget your master password, you'll need to reset the TPM state 103 - This will delete all keys stored in the TPM 104 - To reset: 105 ``` 106 sudo rm -rf ~/.keepsync/tpm 107 ``` 108 109 ## Security Considerations 110 111 1. **Password Strength**: 112 - Use a strong master password (minimum 8 characters) 113 - Include uppercase, lowercase, numbers, and special characters 114 - Do not reuse passwords from other services 115 116 2. **TPM Access**: 117 - Restrict access to the TPM device to only trusted users 118 - Consider using file system permissions to protect TPM-related files 119 120 3. **Key Management**: 121 - Regularly rotate keys for better security 122 - Back up important keys using the secure backup mechanism 123 124 ## Integration with Other Components 125 126 The TPM password integration works seamlessly with other KeepSync components: 127 128 1. **Encrypted Storage Provider**: 129 - Uses the password-protected TPM for key management 130 - Adds an additional layer of security for stored data 131 132 2. **Key Rotation**: 133 - Supports secure key rotation with password protection 134 - Ensures old keys are securely deleted 135 136 3. **PCR Binding**: 137 - Can bind keys to specific PCR values for system integrity verification 138 - Requires password authentication before PCR binding operations 139 140 ## Future Enhancements 141 142 Planned enhancements for the TPM password integration: 143 144 1. **Password Complexity Requirements**: 145 - Enforce minimum password complexity 146 - Prevent common passwords 147 148 2. **Password Change Functionality**: 149 - Allow users to change their master password 150 - Implement secure password recovery options 151 152 3. **Multi-factor Authentication**: 153 - Add support for hardware security keys 154 - Implement time-based one-time passwords (TOTP) 155 156 4. **Enhanced Audit Logging**: 157 - Log all authentication attempts 158 - Provide detailed information about TPM operations 159 160 ## Conclusion 161 162 The TPM password integration adds a critical layer of security to KeepSync by requiring a master password for all TPM operations. This prevents unauthorized access to encryption keys even if the system is compromised. By using real TPM hardware, we ensure that the security guarantees are backed by hardware-based protection.