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45 lines
2.4 KiB
Markdown
45 lines
2.4 KiB
Markdown
# `:core:database`
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This module provides the local Room database persistence layer for the application using Room Kotlin Multiplatform (KMP).
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## Key Components
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- **`MeshtasticDatabase`**: The main Room database class, defined in `commonMain`.
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- **DAOs (Data Access Objects)**:
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- `NodeInfoDao`: Manages storage and retrieval of node information (`NodeEntity`). Contains critical logic for handling Public Key Conflict (PKC) resolution and preventing identity wiping attacks.
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- `PacketDao`: Handles storage of mesh packets, including text messages, waypoints, and reactions.
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- **Entities**:
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- `NodeEntity`: Represents a node on the mesh.
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- `Packet`: Represents a stored packet.
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- `ReactionEntity`: Represents emoji reactions to packets.
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## Security Considerations
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### Public Key Conflict (PKC) Handling
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The `NodeInfoDao` implements specific logic to protect against impersonation and "wipe" attacks:
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- **Wipe Protection**: Receiving an `is_licensed=true` packet (which normally clears the public key for compliance) will **not** clear an existing valid public key if one is already known. This prevents attackers from sending fake licensed packets to wipe keys from the DB.
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- **Conflict Detection**: If a new key arrives for an existing node ID that conflicts with a known valid key, the key is set to `ERROR_BYTE_STRING` to flag the potential impersonation.
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## Module dependency graph
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<!--region graph-->
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```mermaid
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graph TB
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:core:database[database]:::kmp-library
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classDef android-application fill:#CAFFBF,stroke:#000,stroke-width:2px,color:#000;
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classDef android-application-compose fill:#CAFFBF,stroke:#000,stroke-width:2px,color:#000;
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classDef compose-desktop-application fill:#CAFFBF,stroke:#000,stroke-width:2px,color:#000;
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classDef android-feature fill:#FFD6A5,stroke:#000,stroke-width:2px,color:#000;
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classDef android-library fill:#9BF6FF,stroke:#000,stroke-width:2px,color:#000;
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classDef android-library-compose fill:#9BF6FF,stroke:#000,stroke-width:2px,color:#000;
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classDef android-test fill:#A0C4FF,stroke:#000,stroke-width:2px,color:#000;
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classDef jvm-library fill:#BDB2FF,stroke:#000,stroke-width:2px,color:#000;
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classDef kmp-feature fill:#FFD6A5,stroke:#000,stroke-width:2px,color:#000;
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classDef kmp-library-compose fill:#FFC1CC,stroke:#000,stroke-width:2px,color:#000;
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classDef kmp-library fill:#FFC1CC,stroke:#000,stroke-width:2px,color:#000;
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classDef unknown fill:#FFADAD,stroke:#000,stroke-width:2px,color:#000;
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```
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<!--endregion-->
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