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93 lines
2.8 KiB
C++
93 lines
2.8 KiB
C++
#ifndef LLARP_KEY_MANAGER_HPP
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#define LLARP_KEY_MANAGER_HPP
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#include <atomic>
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#include <config/config.hpp>
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#include <crypto/types.hpp>
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#include <router_contact.hpp>
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namespace llarp
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{
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/// KeyManager manages the cryptographic keys stored on disk for the local
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/// node. This includes private keys as well as the self-signed router contact
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/// file (e.g. "self.signed").
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///
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/// Keys are either read from disk if they exist and are valid (see below) or
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/// are generated and written to disk.
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///
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/// In addition, the KeyManager detects when the keys obsolete (e.g. as a
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/// result of a software upgrade) and backs up existing keys before writing
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/// out new ones.
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struct KeyManager
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{
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/// Utility function to backup a file by moving it. Attempts to find a new
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/// filename based on the original that doesn't exist, then moves it. The
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/// pattern used is originalFile.N.bak where N is the lowest integer
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/// matching a filename that doesn't exist.
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///
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/// @param filepath is the name of the original file to backup.
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/// @return true if the file could be moved or didn't exist, false otherwise
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static bool
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backupFileByMoving(const fs::path& filepath);
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/// Constructor
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KeyManager();
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/// Initializes keys using the provided config, loading from disk
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///
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/// NOTE: Must be called prior to obtaining any keys.
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/// NOTE: blocks on I/O
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///
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/// @param config should be a prepared config object
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/// @param genIfAbsent determines whether or not we will create files if they
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/// do not exist.
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/// @param isRouter
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/// @return true on success, false otherwise
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bool
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initialize(const llarp::Config& config, bool genIfAbsent, bool isRouter);
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/// Obtain the self-signed RouterContact
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///
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/// @param rc (out) will be modified to contian the RouterContact
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/// @return true on success, false otherwise
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bool
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getRouterContact(llarp::RouterContact& rc) const;
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/// Return whether or not we need to backup keys as we load them
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bool
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needBackup() const
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{
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return m_needBackup;
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}
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llarp::SecretKey identityKey;
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llarp::SecretKey encryptionKey;
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llarp::SecretKey transportKey;
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fs::path m_rcPath;
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fs::path m_idKeyPath;
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fs::path m_encKeyPath;
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fs::path m_transportKeyPath;
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private:
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std::atomic_bool m_initialized;
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std::atomic_bool m_needBackup;
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/// Backup each key file (by copying, e.g. foo -> foo.bak)
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bool
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backupKeyFilesByMoving() const;
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/// Load the key at a given filepath or create it
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///
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/// @param keygen is a function that will generate the key if needed
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static bool
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loadOrCreateKey(
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fs::path filepath,
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llarp::SecretKey& key,
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std::function<void(llarp::SecretKey& key)> keygen);
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};
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} // namespace llarp
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#endif
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