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1 : : // Copyright (c) 2019-2022 The Bitcoin Core developers
2 : : // Distributed under the MIT software license, see the accompanying
3 : : // file COPYING or http://www.opensource.org/licenses/mit-license.php.
4 : :
5 : : #ifndef BITCOIN_WALLET_SCRIPTPUBKEYMAN_H
6 : : #define BITCOIN_WALLET_SCRIPTPUBKEYMAN_H
7 : :
8 : : #include <addresstype.h>
9 : : #include <common/messages.h>
10 : : #include <common/signmessage.h>
11 : : #include <common/types.h>
12 : : #include <logging.h>
13 : : #include <node/types.h>
14 : : #include <psbt.h>
15 : : #include <script/descriptor.h>
16 : : #include <script/script.h>
17 : : #include <script/signingprovider.h>
18 : : #include <util/result.h>
19 : : #include <util/time.h>
20 : : #include <wallet/crypter.h>
21 : : #include <wallet/types.h>
22 : : #include <wallet/walletdb.h>
23 : : #include <wallet/walletutil.h>
24 : :
25 : : #include <boost/signals2/signal.hpp>
26 : :
27 : : #include <functional>
28 : : #include <optional>
29 : : #include <unordered_map>
30 : :
31 : : enum class OutputType;
32 : :
33 : : namespace wallet {
34 : : struct MigrationData;
35 : : class ScriptPubKeyMan;
36 : :
37 : : // Wallet storage things that ScriptPubKeyMans need in order to be able to store things to the wallet database.
38 : : // It provides access to things that are part of the entire wallet and not specific to a ScriptPubKeyMan such as
39 : : // wallet flags, wallet version, encryption keys, encryption status, and the database itself. This allows a
40 : : // ScriptPubKeyMan to have callbacks into CWallet without causing a circular dependency.
41 : : // WalletStorage should be the same for all ScriptPubKeyMans of a wallet.
42 [ + - ]: 830 : class WalletStorage
43 : : {
44 : : public:
45 : 830 : virtual ~WalletStorage() = default;
46 : : virtual std::string GetDisplayName() const = 0;
47 : : virtual WalletDatabase& GetDatabase() const = 0;
48 : : virtual bool IsWalletFlagSet(uint64_t) const = 0;
49 : : virtual void UnsetBlankWalletFlag(WalletBatch&) = 0;
50 : : virtual bool CanSupportFeature(enum WalletFeature) const = 0;
51 : : virtual void SetMinVersion(enum WalletFeature, WalletBatch* = nullptr) = 0;
52 : : //! Pass the encryption key to cb().
53 : : virtual bool WithEncryptionKey(std::function<bool (const CKeyingMaterial&)> cb) const = 0;
54 : : virtual bool HasEncryptionKeys() const = 0;
55 : : virtual bool IsLocked() const = 0;
56 : : //! Callback function for after TopUp completes containing any scripts that were added by a SPKMan
57 : : virtual void TopUpCallback(const std::set<CScript>&, ScriptPubKeyMan*) = 0;
58 : : };
59 : :
60 : : //! Constant representing an unknown spkm creation time
61 : : static constexpr int64_t UNKNOWN_TIME = std::numeric_limits<int64_t>::max();
62 : :
63 : : //! Default for -keypool
64 : : static const unsigned int DEFAULT_KEYPOOL_SIZE = 1000;
65 : :
66 : : std::vector<CKeyID> GetAffectedKeys(const CScript& spk, const SigningProvider& provider);
67 : :
68 : : /** A key from a CWallet's keypool
69 : : *
70 : : * The wallet holds one (for pre HD-split wallets) or several keypools. These
71 : : * are sets of keys that have not yet been used to provide addresses or receive
72 : : * change.
73 : : *
74 : : * The Bitcoin Core wallet was originally a collection of unrelated private
75 : : * keys with their associated addresses. If a non-HD wallet generated a
76 : : * key/address, gave that address out and then restored a backup from before
77 : : * that key's generation, then any funds sent to that address would be
78 : : * lost definitively.
79 : : *
80 : : * The keypool was implemented to avoid this scenario (commit: 10384941). The
81 : : * wallet would generate a set of keys (100 by default). When a new public key
82 : : * was required, either to give out as an address or to use in a change output,
83 : : * it would be drawn from the keypool. The keypool would then be topped up to
84 : : * maintain 100 keys. This ensured that as long as the wallet hadn't used more
85 : : * than 100 keys since the previous backup, all funds would be safe, since a
86 : : * restored wallet would be able to scan for all owned addresses.
87 : : *
88 : : * A keypool also allowed encrypted wallets to give out addresses without
89 : : * having to be decrypted to generate a new private key.
90 : : *
91 : : * With the introduction of HD wallets (commit: f1902510), the keypool
92 : : * essentially became an address look-ahead pool. Restoring old backups can no
93 : : * longer definitively lose funds as long as the addresses used were from the
94 : : * wallet's HD seed (since all private keys can be rederived from the seed).
95 : : * However, if many addresses were used since the backup, then the wallet may
96 : : * not know how far ahead in the HD chain to look for its addresses. The
97 : : * keypool is used to implement a 'gap limit'. The keypool maintains a set of
98 : : * keys (by default 1000) ahead of the last used key and scans for the
99 : : * addresses of those keys. This avoids the risk of not seeing transactions
100 : : * involving the wallet's addresses, or of re-using the same address.
101 : : * In the unlikely case where none of the addresses in the `gap limit` are
102 : : * used on-chain, the look-ahead will not be incremented to keep
103 : : * a constant size and addresses beyond this range will not be detected by an
104 : : * old backup. For this reason, it is not recommended to decrease keypool size
105 : : * lower than default value.
106 : : *
107 : : * The HD-split wallet feature added a second keypool (commit: 02592f4c). There
108 : : * is an external keypool (for addresses to hand out) and an internal keypool
109 : : * (for change addresses).
110 : : *
111 : : * Keypool keys are stored in the wallet/keystore's keymap. The keypool data is
112 : : * stored as sets of indexes in the wallet (setInternalKeyPool,
113 : : * setExternalKeyPool and set_pre_split_keypool), and a map from the key to the
114 : : * index (m_pool_key_to_index). The CKeyPool object is used to
115 : : * serialize/deserialize the pool data to/from the database.
116 : : */
117 : : class CKeyPool
118 : : {
119 : : public:
120 : : //! The time at which the key was generated. Set in AddKeypoolPubKeyWithDB
121 : : int64_t nTime;
122 : : //! The public key
123 : : CPubKey vchPubKey;
124 : : //! Whether this keypool entry is in the internal keypool (for change outputs)
125 : : bool fInternal;
126 : : //! Whether this key was generated for a keypool before the wallet was upgraded to HD-split
127 : : bool m_pre_split;
128 : :
129 : : CKeyPool();
130 : : CKeyPool(const CPubKey& vchPubKeyIn, bool internalIn);
131 : :
132 : : template<typename Stream>
133 : 2004 : void Serialize(Stream& s) const
134 : : {
135 : 2004 : s << int{259900}; // Unused field, writes the highest client version ever written
136 : 2004 : s << nTime << vchPubKey << fInternal << m_pre_split;
137 : 2004 : }
138 : :
139 : : template<typename Stream>
140 : 4001 : void Unserialize(Stream& s)
141 : : {
142 : 4001 : s >> int{}; // Discard unused field
143 : 4001 : s >> nTime >> vchPubKey;
144 : : try {
145 [ + - ]: 4001 : s >> fInternal;
146 [ - - ]: 0 : } catch (std::ios_base::failure&) {
147 : : /* flag as external address if we can't read the internal boolean
148 : : (this will be the case for any wallet before the HD chain split version) */
149 : 0 : fInternal = false;
150 : : }
151 : : try {
152 [ + - ]: 4001 : s >> m_pre_split;
153 [ - - ]: 0 : } catch (std::ios_base::failure&) {
154 : : /* flag as postsplit address if we can't read the m_pre_split boolean
155 : : (this will be the case for any wallet that upgrades to HD chain split) */
156 : 0 : m_pre_split = false;
157 : : }
158 : 4001 : }
159 : : };
160 : :
161 : 91526 : struct WalletDestination
162 : : {
163 : : CTxDestination dest;
164 : : std::optional<bool> internal;
165 : : };
166 : :
167 : : /*
168 : : * A class implementing ScriptPubKeyMan manages some (or all) scriptPubKeys used in a wallet.
169 : : * It contains the scripts and keys related to the scriptPubKeys it manages.
170 : : * A ScriptPubKeyMan will be able to give out scriptPubKeys to be used, as well as marking
171 : : * when a scriptPubKey has been used. It also handles when and how to store a scriptPubKey
172 : : * and its related scripts and keys, including encryption.
173 : : */
174 : : class ScriptPubKeyMan
175 : : {
176 : : protected:
177 : : WalletStorage& m_storage;
178 : :
179 : : public:
180 [ + - + - ]: 5302 : explicit ScriptPubKeyMan(WalletStorage& storage) : m_storage(storage) {}
181 : 5302 : virtual ~ScriptPubKeyMan() = default;
182 [ # # ]: 0 : virtual util::Result<CTxDestination> GetNewDestination(const OutputType type) { return util::Error{Untranslated("Not supported")}; }
183 : 0 : virtual isminetype IsMine(const CScript& script) const { return ISMINE_NO; }
184 : :
185 : : //! Check that the given decryption key is valid for this ScriptPubKeyMan, i.e. it decrypts all of the keys handled by it.
186 : 0 : virtual bool CheckDecryptionKey(const CKeyingMaterial& master_key) { return false; }
187 : 0 : virtual bool Encrypt(const CKeyingMaterial& master_key, WalletBatch* batch) { return false; }
188 : :
189 [ # # ]: 0 : virtual util::Result<CTxDestination> GetReservedDestination(const OutputType type, bool internal, int64_t& index, CKeyPool& keypool) { return util::Error{Untranslated("Not supported")}; }
190 : 1779 : virtual void KeepDestination(int64_t index, const OutputType& type) {}
191 : 0 : virtual void ReturnDestination(int64_t index, bool internal, const CTxDestination& addr) {}
192 : :
193 : : /** Fills internal address pool. Use within ScriptPubKeyMan implementations should be used sparingly and only
194 : : * when something from the address pool is removed, excluding GetNewDestination and GetReservedDestination.
195 : : * External wallet code is primarily responsible for topping up prior to fetching new addresses
196 : : */
197 : 0 : virtual bool TopUp(unsigned int size = 0) { return false; }
198 : :
199 : : /** Mark unused addresses as being used
200 : : * Affects all keys up to and including the one determined by provided script.
201 : : *
202 : : * @param script determines the last key to mark as used
203 : : *
204 : : * @return All of the addresses affected
205 : : */
206 : 0 : virtual std::vector<WalletDestination> MarkUnusedAddresses(const CScript& script) { return {}; }
207 : :
208 : : /** Sets up the key generation stuff, i.e. generates new HD seeds and sets them as active.
209 : : * Returns false if already setup or setup fails, true if setup is successful
210 : : * Set force=true to make it re-setup if already setup, used for upgrades
211 : : */
212 : 0 : virtual bool SetupGeneration(bool force = false) { return false; }
213 : :
214 : : /* Returns true if HD is enabled */
215 : 0 : virtual bool IsHDEnabled() const { return false; }
216 : :
217 : : /* Returns true if the wallet can give out new addresses. This means it has keys in the keypool or can generate new keys */
218 : 0 : virtual bool CanGetAddresses(bool internal = false) const { return false; }
219 : :
220 : : /** Upgrades the wallet to the specified version */
221 : 0 : virtual bool Upgrade(int prev_version, int new_version, bilingual_str& error) { return true; }
222 : :
223 : 0 : virtual bool HavePrivateKeys() const { return false; }
224 : :
225 : : //! The action to do when the DB needs rewrite
226 : 0 : virtual void RewriteDB() {}
227 : :
228 : 0 : virtual std::optional<int64_t> GetOldestKeyPoolTime() const { return GetTime(); }
229 : :
230 : 0 : virtual unsigned int GetKeyPoolSize() const { return 0; }
231 : :
232 : 0 : virtual int64_t GetTimeFirstKey() const { return 0; }
233 : :
234 : 0 : virtual std::unique_ptr<CKeyMetadata> GetMetadata(const CTxDestination& dest) const { return nullptr; }
235 : :
236 : 0 : virtual std::unique_ptr<SigningProvider> GetSolvingProvider(const CScript& script) const { return nullptr; }
237 : :
238 : : /** Whether this ScriptPubKeyMan can provide a SigningProvider (via GetSolvingProvider) that, combined with
239 : : * sigdata, can produce solving data.
240 : : */
241 : 0 : virtual bool CanProvide(const CScript& script, SignatureData& sigdata) { return false; }
242 : :
243 : : /** Creates new signatures and adds them to the transaction. Returns whether all inputs were signed */
244 : 0 : virtual bool SignTransaction(CMutableTransaction& tx, const std::map<COutPoint, Coin>& coins, int sighash, std::map<int, bilingual_str>& input_errors) const { return false; }
245 : : /** Sign a message with the given script */
246 : 0 : virtual SigningResult SignMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) const { return SigningResult::SIGNING_FAILED; };
247 : : /** Adds script and derivation path information to a PSBT, and optionally signs it. */
248 : 0 : virtual std::optional<common::PSBTError> FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type = SIGHASH_DEFAULT, bool sign = true, bool bip32derivs = false, int* n_signed = nullptr, bool finalize = true) const { return common::PSBTError::UNSUPPORTED; }
249 : :
250 : 0 : virtual uint256 GetID() const { return uint256(); }
251 : :
252 : : /** Returns a set of all the scriptPubKeys that this ScriptPubKeyMan watches */
253 : 0 : virtual std::unordered_set<CScript, SaltedSipHasher> GetScriptPubKeys() const { return {}; };
254 : :
255 : : /** Prepends the wallet name in logging output to ease debugging in multi-wallet use cases */
256 : : template <typename... Params>
257 : 515 : void WalletLogPrintf(util::ConstevalFormatString<sizeof...(Params)> wallet_fmt, const Params&... params) const
258 : : {
259 [ + - + - ]: 1030 : LogInfo("%s %s", m_storage.GetDisplayName(), tfm::format(wallet_fmt, params...));
260 : 515 : };
261 : :
262 : : /** Watch-only address added */
263 : : boost::signals2::signal<void (bool fHaveWatchOnly)> NotifyWatchonlyChanged;
264 : :
265 : : /** Keypool has new keys */
266 : : boost::signals2::signal<void ()> NotifyCanGetAddressesChanged;
267 : :
268 : : /** Birth time changed */
269 : : boost::signals2::signal<void (const ScriptPubKeyMan* spkm, int64_t new_birth_time)> NotifyFirstKeyTimeChanged;
270 : : };
271 : :
272 : : /** OutputTypes supported by the LegacyScriptPubKeyMan */
273 : : static const std::unordered_set<OutputType> LEGACY_OUTPUT_TYPES {
274 : : OutputType::LEGACY,
275 : : OutputType::P2SH_SEGWIT,
276 : : OutputType::BECH32,
277 : : };
278 : :
279 : : class DescriptorScriptPubKeyMan;
280 : :
281 : : // Manages the data for a LegacyScriptPubKeyMan.
282 : : // This is the minimum necessary to load a legacy wallet so that it can be migrated.
283 : : class LegacyDataSPKM : public ScriptPubKeyMan, public FillableSigningProvider
284 : : {
285 : : protected:
286 : : using WatchOnlySet = std::set<CScript>;
287 : : using WatchKeyMap = std::map<CKeyID, CPubKey>;
288 : : using CryptedKeyMap = std::map<CKeyID, std::pair<CPubKey, std::vector<unsigned char>>>;
289 : :
290 : : CryptedKeyMap mapCryptedKeys GUARDED_BY(cs_KeyStore);
291 : : WatchOnlySet setWatchOnly GUARDED_BY(cs_KeyStore);
292 : : WatchKeyMap mapWatchKeys GUARDED_BY(cs_KeyStore);
293 : :
294 : : /* the HD chain data model (external chain counters) */
295 : : CHDChain m_hd_chain;
296 : : std::unordered_map<CKeyID, CHDChain, SaltedSipHasher> m_inactive_hd_chains;
297 : :
298 : : //! keeps track of whether Unlock has run a thorough check before
299 : : bool fDecryptionThoroughlyChecked = true;
300 : :
301 : : bool AddWatchOnlyInMem(const CScript &dest);
302 : : virtual bool AddKeyPubKeyInner(const CKey& key, const CPubKey &pubkey);
303 : : bool AddCryptedKeyInner(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret);
304 : :
305 : : public:
306 : : using ScriptPubKeyMan::ScriptPubKeyMan;
307 : :
308 : : // Map from Key ID to key metadata.
309 : : std::map<CKeyID, CKeyMetadata> mapKeyMetadata GUARDED_BY(cs_KeyStore);
310 : :
311 : : // Map from Script ID to key metadata (for watch-only keys).
312 : : std::map<CScriptID, CKeyMetadata> m_script_metadata GUARDED_BY(cs_KeyStore);
313 : :
314 : : // ScriptPubKeyMan overrides
315 : : bool CheckDecryptionKey(const CKeyingMaterial& master_key) override;
316 : : std::unordered_set<CScript, SaltedSipHasher> GetScriptPubKeys() const override;
317 : : std::unique_ptr<SigningProvider> GetSolvingProvider(const CScript& script) const override;
318 : 0 : uint256 GetID() const override { return uint256::ONE; }
319 : : // TODO: Remove IsMine when deleting LegacyScriptPubKeyMan
320 : : isminetype IsMine(const CScript& script) const override;
321 : :
322 : : // FillableSigningProvider overrides
323 : : bool HaveKey(const CKeyID &address) const override;
324 : : bool GetKey(const CKeyID &address, CKey& keyOut) const override;
325 : : bool GetPubKey(const CKeyID &address, CPubKey& vchPubKeyOut) const override;
326 : : bool GetKeyOrigin(const CKeyID& keyid, KeyOriginInfo& info) const override;
327 : :
328 : : std::set<int64_t> setInternalKeyPool GUARDED_BY(cs_KeyStore);
329 : : std::set<int64_t> setExternalKeyPool GUARDED_BY(cs_KeyStore);
330 : : std::set<int64_t> set_pre_split_keypool GUARDED_BY(cs_KeyStore);
331 : : int64_t m_max_keypool_index GUARDED_BY(cs_KeyStore) = 0;
332 : : std::map<CKeyID, int64_t> m_pool_key_to_index;
333 : :
334 : : //! Load metadata (used by LoadWallet)
335 : : virtual void LoadKeyMetadata(const CKeyID& keyID, const CKeyMetadata &metadata);
336 : : virtual void LoadScriptMetadata(const CScriptID& script_id, const CKeyMetadata &metadata);
337 : :
338 : : //! Adds a watch-only address to the store, without saving it to disk (used by LoadWallet)
339 : : bool LoadWatchOnly(const CScript &dest);
340 : : //! Returns whether the watch-only script is in the wallet
341 : : bool HaveWatchOnly(const CScript &dest) const;
342 : : //! Returns whether there are any watch-only things in the wallet
343 : : bool HaveWatchOnly() const;
344 : : //! Adds a key to the store, without saving it to disk (used by LoadWallet)
345 : : bool LoadKey(const CKey& key, const CPubKey &pubkey);
346 : : //! Adds an encrypted key to the store, without saving it to disk (used by LoadWallet)
347 : : bool LoadCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret, bool checksum_valid);
348 : : //! Adds a CScript to the store
349 : : bool LoadCScript(const CScript& redeemScript);
350 : : //! Load a HD chain model (used by LoadWallet)
351 : : void LoadHDChain(const CHDChain& chain);
352 : : void AddInactiveHDChain(const CHDChain& chain);
353 : : const CHDChain& GetHDChain() const { return m_hd_chain; }
354 : : //! Load a keypool entry
355 : : void LoadKeyPool(int64_t nIndex, const CKeyPool &keypool);
356 : :
357 : : //! Fetches a pubkey from mapWatchKeys if it exists there
358 : : bool GetWatchPubKey(const CKeyID &address, CPubKey &pubkey_out) const;
359 : :
360 : : /**
361 : : * Retrieves scripts that were imported by bugs into the legacy spkm and are
362 : : * simply invalid, such as a sh(sh(pkh())) script, or not watched.
363 : : */
364 : : std::unordered_set<CScript, SaltedSipHasher> GetNotMineScriptPubKeys() const;
365 : :
366 : : /** Get the DescriptorScriptPubKeyMans (with private keys) that have the same scriptPubKeys as this LegacyScriptPubKeyMan.
367 : : * Does not modify this ScriptPubKeyMan. */
368 : : std::optional<MigrationData> MigrateToDescriptor();
369 : : /** Delete all the records of this LegacyScriptPubKeyMan from disk*/
370 : : bool DeleteRecords();
371 : : bool DeleteRecordsWithDB(WalletBatch& batch);
372 : : };
373 : :
374 : : // Implements the full legacy wallet behavior
375 : : class LegacyScriptPubKeyMan : public LegacyDataSPKM
376 : : {
377 : : private:
378 : : WalletBatch *encrypted_batch GUARDED_BY(cs_KeyStore) = nullptr;
379 : :
380 : : // By default, do not scan any block until keys/scripts are generated/imported
381 : : int64_t nTimeFirstKey GUARDED_BY(cs_KeyStore) = UNKNOWN_TIME;
382 : :
383 : : //! Number of pre-generated keys/scripts (part of the look-ahead process, used to detect payments)
384 : : int64_t m_keypool_size GUARDED_BY(cs_KeyStore){DEFAULT_KEYPOOL_SIZE};
385 : :
386 : : bool AddKeyPubKeyInner(const CKey& key, const CPubKey &pubkey) override;
387 : :
388 : : /**
389 : : * Private version of AddWatchOnly method which does not accept a
390 : : * timestamp, and which will reset the wallet's nTimeFirstKey value to 1 if
391 : : * the watch key did not previously have a timestamp associated with it.
392 : : * Because this is an inherited virtual method, it is accessible despite
393 : : * being marked private, but it is marked private anyway to encourage use
394 : : * of the other AddWatchOnly which accepts a timestamp and sets
395 : : * nTimeFirstKey more intelligently for more efficient rescans.
396 : : */
397 : : bool AddWatchOnly(const CScript& dest) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
398 : : bool AddWatchOnlyWithDB(WalletBatch &batch, const CScript& dest) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
399 : : //! Adds a watch-only address to the store, and saves it to disk.
400 : : bool AddWatchOnlyWithDB(WalletBatch &batch, const CScript& dest, int64_t create_time) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
401 : :
402 : : //! Adds a key to the store, and saves it to disk.
403 : : bool AddKeyPubKeyWithDB(WalletBatch &batch,const CKey& key, const CPubKey &pubkey) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
404 : :
405 : : void AddKeypoolPubkeyWithDB(const CPubKey& pubkey, const bool internal, WalletBatch& batch);
406 : :
407 : : //! Adds a script to the store and saves it to disk
408 : : bool AddCScriptWithDB(WalletBatch& batch, const CScript& script);
409 : :
410 : : /** Add a KeyOriginInfo to the wallet */
411 : : bool AddKeyOriginWithDB(WalletBatch& batch, const CPubKey& pubkey, const KeyOriginInfo& info);
412 : :
413 : : /* HD derive new child key (on internal or external chain) */
414 : : void DeriveNewChildKey(WalletBatch& batch, CKeyMetadata& metadata, CKey& secret, CHDChain& hd_chain, bool internal = false) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
415 : :
416 : : // Tracks keypool indexes to CKeyIDs of keys that have been taken out of the keypool but may be returned to it
417 : : std::map<int64_t, CKeyID> m_index_to_reserved_key;
418 : :
419 : : //! Fetches a key from the keypool
420 : : bool GetKeyFromPool(CPubKey &key, const OutputType type);
421 : :
422 : : /**
423 : : * Reserves a key from the keypool and sets nIndex to its index
424 : : *
425 : : * @param[out] nIndex the index of the key in keypool
426 : : * @param[out] keypool the keypool the key was drawn from, which could be the
427 : : * the pre-split pool if present, or the internal or external pool
428 : : * @param fRequestedInternal true if the caller would like the key drawn
429 : : * from the internal keypool, false if external is preferred
430 : : *
431 : : * @return true if succeeded, false if failed due to empty keypool
432 : : * @throws std::runtime_error if keypool read failed, key was invalid,
433 : : * was not found in the wallet, or was misclassified in the internal
434 : : * or external keypool
435 : : */
436 : : bool ReserveKeyFromKeyPool(int64_t& nIndex, CKeyPool& keypool, bool fRequestedInternal);
437 : :
438 : : /**
439 : : * Like TopUp() but adds keys for inactive HD chains.
440 : : * Ensures that there are at least -keypool number of keys derived after the given index.
441 : : *
442 : : * @param seed_id the CKeyID for the HD seed.
443 : : * @param index the index to start generating keys from
444 : : * @param internal whether the internal chain should be used. true for internal chain, false for external chain.
445 : : *
446 : : * @return true if seed was found and keys were derived. false if unable to derive seeds
447 : : */
448 : : bool TopUpInactiveHDChain(const CKeyID seed_id, int64_t index, bool internal);
449 : :
450 : : bool TopUpChain(WalletBatch& batch, CHDChain& chain, unsigned int size);
451 : : public:
452 : 32 : LegacyScriptPubKeyMan(WalletStorage& storage, int64_t keypool_size) : LegacyDataSPKM(storage), m_keypool_size(keypool_size) {}
453 : :
454 : : util::Result<CTxDestination> GetNewDestination(const OutputType type) override;
455 : :
456 : : bool Encrypt(const CKeyingMaterial& master_key, WalletBatch* batch) override;
457 : :
458 : : util::Result<CTxDestination> GetReservedDestination(const OutputType type, bool internal, int64_t& index, CKeyPool& keypool) override;
459 : : void KeepDestination(int64_t index, const OutputType& type) override;
460 : : void ReturnDestination(int64_t index, bool internal, const CTxDestination&) override;
461 : :
462 : : bool TopUp(unsigned int size = 0) override;
463 : :
464 : : std::vector<WalletDestination> MarkUnusedAddresses(const CScript& script) override;
465 : :
466 : : //! Upgrade stored CKeyMetadata objects to store key origin info as KeyOriginInfo
467 : : void UpgradeKeyMetadata();
468 : :
469 : : bool IsHDEnabled() const override;
470 : :
471 : : bool SetupGeneration(bool force = false) override;
472 : :
473 : : bool Upgrade(int prev_version, int new_version, bilingual_str& error) override;
474 : :
475 : : bool HavePrivateKeys() const override;
476 : :
477 : : void RewriteDB() override;
478 : :
479 : : std::optional<int64_t> GetOldestKeyPoolTime() const override;
480 : : size_t KeypoolCountExternalKeys() const;
481 : : unsigned int GetKeyPoolSize() const override;
482 : :
483 : : int64_t GetTimeFirstKey() const override;
484 : :
485 : : std::unique_ptr<CKeyMetadata> GetMetadata(const CTxDestination& dest) const override;
486 : :
487 : : bool CanGetAddresses(bool internal = false) const override;
488 : :
489 : : bool CanProvide(const CScript& script, SignatureData& sigdata) override;
490 : :
491 : : bool SignTransaction(CMutableTransaction& tx, const std::map<COutPoint, Coin>& coins, int sighash, std::map<int, bilingual_str>& input_errors) const override;
492 : : SigningResult SignMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) const override;
493 : : std::optional<common::PSBTError> FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type = SIGHASH_DEFAULT, bool sign = true, bool bip32derivs = false, int* n_signed = nullptr, bool finalize = true) const override;
494 : :
495 : : uint256 GetID() const override;
496 : :
497 : : //! Adds a key to the store, and saves it to disk.
498 : : bool AddKeyPubKey(const CKey& key, const CPubKey &pubkey) override;
499 : : //! Adds an encrypted key to the store, and saves it to disk.
500 : : bool AddCryptedKey(const CPubKey &vchPubKey, const std::vector<unsigned char> &vchCryptedSecret);
501 : : void UpdateTimeFirstKey(int64_t nCreateTime) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
502 : : //! Load metadata (used by LoadWallet)
503 : : void LoadKeyMetadata(const CKeyID& keyID, const CKeyMetadata &metadata) override;
504 : : void LoadScriptMetadata(const CScriptID& script_id, const CKeyMetadata &metadata) override;
505 : : //! Generate a new key
506 : : CPubKey GenerateNewKey(WalletBatch& batch, CHDChain& hd_chain, bool internal = false) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
507 : :
508 : : /* Set the HD chain model (chain child index counters) and writes it to the database */
509 : : void AddHDChain(const CHDChain& chain);
510 : :
511 : : //! Remove a watch only script from the keystore
512 : : bool RemoveWatchOnly(const CScript &dest);
513 : : bool AddWatchOnly(const CScript& dest, int64_t nCreateTime) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
514 : :
515 : : /* SigningProvider overrides */
516 : : bool AddCScript(const CScript& redeemScript) override;
517 : :
518 : : bool NewKeyPool();
519 : : void MarkPreSplitKeys() EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
520 : :
521 : : bool ImportScripts(const std::set<CScript> scripts, int64_t timestamp) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
522 : : bool ImportPrivKeys(const std::map<CKeyID, CKey>& privkey_map, const int64_t timestamp) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
523 : : bool ImportPubKeys(const std::vector<std::pair<CKeyID, bool>>& ordered_pubkeys, const std::map<CKeyID, CPubKey>& pubkey_map, const std::map<CKeyID, std::pair<CPubKey, KeyOriginInfo>>& key_origins, const bool add_keypool, const int64_t timestamp) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
524 : : bool ImportScriptPubKeys(const std::set<CScript>& script_pub_keys, const bool have_solving_data, const int64_t timestamp) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
525 : :
526 : : /* Returns true if the wallet can generate new keys */
527 : : bool CanGenerateKeys() const;
528 : :
529 : : /* Generates a new HD seed (will not be activated) */
530 : : CPubKey GenerateNewSeed();
531 : :
532 : : /* Derives a new HD seed (will not be activated) */
533 : : CPubKey DeriveNewSeed(const CKey& key);
534 : :
535 : : /* Set the current HD seed (will reset the chain child index counters)
536 : : Sets the seed's version based on the current wallet version (so the
537 : : caller must ensure the current wallet version is correct before calling
538 : : this function). */
539 : : void SetHDSeed(const CPubKey& key);
540 : :
541 : : /**
542 : : * Explicitly make the wallet learn the related scripts for outputs to the
543 : : * given key. This is purely to make the wallet file compatible with older
544 : : * software, as FillableSigningProvider automatically does this implicitly for all
545 : : * keys now.
546 : : */
547 : : void LearnRelatedScripts(const CPubKey& key, OutputType);
548 : :
549 : : /**
550 : : * Same as LearnRelatedScripts, but when the OutputType is not known (and could
551 : : * be anything).
552 : : */
553 : : void LearnAllRelatedScripts(const CPubKey& key);
554 : :
555 : : /**
556 : : * Marks all keys in the keypool up to and including the provided key as used.
557 : : *
558 : : * @param keypool_id determines the last key to mark as used
559 : : *
560 : : * @return All affected keys
561 : : */
562 : : std::vector<CKeyPool> MarkReserveKeysAsUsed(int64_t keypool_id) EXCLUSIVE_LOCKS_REQUIRED(cs_KeyStore);
563 [ + - ]: 1 : const std::map<CKeyID, int64_t>& GetAllReserveKeys() const { return m_pool_key_to_index; }
564 : :
565 : : std::set<CKeyID> GetKeys() const override;
566 : : };
567 : :
568 : : /** Wraps a LegacyScriptPubKeyMan so that it can be returned in a new unique_ptr. Does not provide privkeys */
569 : : class LegacySigningProvider : public SigningProvider
570 : : {
571 : : private:
572 : : const LegacyDataSPKM& m_spk_man;
573 : : public:
574 : 0 : explicit LegacySigningProvider(const LegacyDataSPKM& spk_man) : m_spk_man(spk_man) {}
575 : :
576 : 0 : bool GetCScript(const CScriptID &scriptid, CScript& script) const override { return m_spk_man.GetCScript(scriptid, script); }
577 : 0 : bool HaveCScript(const CScriptID &scriptid) const override { return m_spk_man.HaveCScript(scriptid); }
578 : 0 : bool GetPubKey(const CKeyID &address, CPubKey& pubkey) const override { return m_spk_man.GetPubKey(address, pubkey); }
579 : 0 : bool GetKey(const CKeyID &address, CKey& key) const override { return false; }
580 : 0 : bool HaveKey(const CKeyID &address) const override { return false; }
581 : 0 : bool GetKeyOrigin(const CKeyID& keyid, KeyOriginInfo& info) const override { return m_spk_man.GetKeyOrigin(keyid, info); }
582 : : };
583 : :
584 : : class DescriptorScriptPubKeyMan : public ScriptPubKeyMan
585 : : {
586 : : friend class LegacyDataSPKM;
587 : : private:
588 : : using ScriptPubKeyMap = std::map<CScript, int32_t>; // Map of scripts to descriptor range index
589 : : using PubKeyMap = std::map<CPubKey, int32_t>; // Map of pubkeys involved in scripts to descriptor range index
590 : : using CryptedKeyMap = std::map<CKeyID, std::pair<CPubKey, std::vector<unsigned char>>>;
591 : : using KeyMap = std::map<CKeyID, CKey>;
592 : :
593 : : ScriptPubKeyMap m_map_script_pub_keys GUARDED_BY(cs_desc_man);
594 : : PubKeyMap m_map_pubkeys GUARDED_BY(cs_desc_man);
595 : : int32_t m_max_cached_index = -1;
596 : :
597 : : KeyMap m_map_keys GUARDED_BY(cs_desc_man);
598 : : CryptedKeyMap m_map_crypted_keys GUARDED_BY(cs_desc_man);
599 : :
600 : : //! keeps track of whether Unlock has run a thorough check before
601 : : bool m_decryption_thoroughly_checked = false;
602 : :
603 : : //! Number of pre-generated keys/scripts (part of the look-ahead process, used to detect payments)
604 : : int64_t m_keypool_size GUARDED_BY(cs_desc_man){DEFAULT_KEYPOOL_SIZE};
605 : :
606 : : bool AddDescriptorKeyWithDB(WalletBatch& batch, const CKey& key, const CPubKey &pubkey) EXCLUSIVE_LOCKS_REQUIRED(cs_desc_man);
607 : :
608 : : KeyMap GetKeys() const EXCLUSIVE_LOCKS_REQUIRED(cs_desc_man);
609 : :
610 : : // Cached FlatSigningProviders to avoid regenerating them each time they are needed.
611 : : mutable std::map<int32_t, FlatSigningProvider> m_map_signing_providers;
612 : : // Fetch the SigningProvider for the given script and optionally include private keys
613 : : std::unique_ptr<FlatSigningProvider> GetSigningProvider(const CScript& script, bool include_private = false) const;
614 : : // Fetch the SigningProvider for the given pubkey and always include private keys. This should only be called by signing code.
615 : : std::unique_ptr<FlatSigningProvider> GetSigningProvider(const CPubKey& pubkey) const;
616 : : // Fetch the SigningProvider for a given index and optionally include private keys. Called by the above functions.
617 : : std::unique_ptr<FlatSigningProvider> GetSigningProvider(int32_t index, bool include_private = false) const EXCLUSIVE_LOCKS_REQUIRED(cs_desc_man);
618 : :
619 : : protected:
620 : : WalletDescriptor m_wallet_descriptor GUARDED_BY(cs_desc_man);
621 : :
622 : : //! Same as 'TopUp' but designed for use within a batch transaction context
623 : : bool TopUpWithDB(WalletBatch& batch, unsigned int size = 0);
624 : :
625 : : public:
626 : 2564 : DescriptorScriptPubKeyMan(WalletStorage& storage, WalletDescriptor& descriptor, int64_t keypool_size)
627 : 2564 : : ScriptPubKeyMan(storage),
628 [ + - ]: 2564 : m_keypool_size(keypool_size),
629 [ + - ]: 2564 : m_wallet_descriptor(descriptor)
630 : 2564 : {}
631 : 2706 : DescriptorScriptPubKeyMan(WalletStorage& storage, int64_t keypool_size)
632 : 2706 : : ScriptPubKeyMan(storage),
633 : 2706 : m_keypool_size(keypool_size)
634 : 2706 : {}
635 : :
636 : : mutable RecursiveMutex cs_desc_man;
637 : :
638 : : util::Result<CTxDestination> GetNewDestination(const OutputType type) override;
639 : : isminetype IsMine(const CScript& script) const override;
640 : :
641 : : bool CheckDecryptionKey(const CKeyingMaterial& master_key) override;
642 : : bool Encrypt(const CKeyingMaterial& master_key, WalletBatch* batch) override;
643 : :
644 : : util::Result<CTxDestination> GetReservedDestination(const OutputType type, bool internal, int64_t& index, CKeyPool& keypool) override;
645 : : void ReturnDestination(int64_t index, bool internal, const CTxDestination& addr) override;
646 : :
647 : : // Tops up the descriptor cache and m_map_script_pub_keys. The cache is stored in the wallet file
648 : : // and is used to expand the descriptor in GetNewDestination. DescriptorScriptPubKeyMan relies
649 : : // more on ephemeral data than LegacyScriptPubKeyMan. For wallets using unhardened derivation
650 : : // (with or without private keys), the "keypool" is a single xpub.
651 : : bool TopUp(unsigned int size = 0) override;
652 : :
653 : : std::vector<WalletDestination> MarkUnusedAddresses(const CScript& script) override;
654 : :
655 : : bool IsHDEnabled() const override;
656 : :
657 : : //! Setup descriptors based on the given CExtkey
658 : : bool SetupDescriptorGeneration(WalletBatch& batch, const CExtKey& master_key, OutputType addr_type, bool internal);
659 : :
660 : : bool HavePrivateKeys() const override;
661 : : bool HasPrivKey(const CKeyID& keyid) const EXCLUSIVE_LOCKS_REQUIRED(cs_desc_man);
662 : : //! Retrieve the particular key if it is available. Returns nullopt if the key is not in the wallet, or if the wallet is locked.
663 : : std::optional<CKey> GetKey(const CKeyID& keyid) const EXCLUSIVE_LOCKS_REQUIRED(cs_desc_man);
664 : :
665 : : std::optional<int64_t> GetOldestKeyPoolTime() const override;
666 : : unsigned int GetKeyPoolSize() const override;
667 : :
668 : : int64_t GetTimeFirstKey() const override;
669 : :
670 : : std::unique_ptr<CKeyMetadata> GetMetadata(const CTxDestination& dest) const override;
671 : :
672 : : bool CanGetAddresses(bool internal = false) const override;
673 : :
674 : : std::unique_ptr<SigningProvider> GetSolvingProvider(const CScript& script) const override;
675 : :
676 : : bool CanProvide(const CScript& script, SignatureData& sigdata) override;
677 : :
678 : : bool SignTransaction(CMutableTransaction& tx, const std::map<COutPoint, Coin>& coins, int sighash, std::map<int, bilingual_str>& input_errors) const override;
679 : : SigningResult SignMessage(const std::string& message, const PKHash& pkhash, std::string& str_sig) const override;
680 : : std::optional<common::PSBTError> FillPSBT(PartiallySignedTransaction& psbt, const PrecomputedTransactionData& txdata, int sighash_type = SIGHASH_DEFAULT, bool sign = true, bool bip32derivs = false, int* n_signed = nullptr, bool finalize = true) const override;
681 : :
682 : : uint256 GetID() const override;
683 : :
684 : : void SetCache(const DescriptorCache& cache);
685 : :
686 : : bool AddKey(const CKeyID& key_id, const CKey& key);
687 : : bool AddCryptedKey(const CKeyID& key_id, const CPubKey& pubkey, const std::vector<unsigned char>& crypted_key);
688 : :
689 : : bool HasWalletDescriptor(const WalletDescriptor& desc) const;
690 : : void UpdateWalletDescriptor(WalletDescriptor& descriptor);
691 : : bool CanUpdateToWalletDescriptor(const WalletDescriptor& descriptor, std::string& error);
692 : : void AddDescriptorKey(const CKey& key, const CPubKey &pubkey);
693 : : void WriteDescriptor();
694 : :
695 : : WalletDescriptor GetWalletDescriptor() const EXCLUSIVE_LOCKS_REQUIRED(cs_desc_man);
696 : : std::unordered_set<CScript, SaltedSipHasher> GetScriptPubKeys() const override;
697 : : std::unordered_set<CScript, SaltedSipHasher> GetScriptPubKeys(int32_t minimum_index) const;
698 : : int32_t GetEndRange() const;
699 : :
700 : : [[nodiscard]] bool GetDescriptorString(std::string& out, const bool priv) const;
701 : :
702 : : void UpgradeDescriptorCache();
703 : : };
704 : :
705 : : /** struct containing information needed for migrating legacy wallets to descriptor wallets */
706 : : struct MigrationData
707 : : {
708 : : CExtKey master_key;
709 : : std::vector<std::pair<std::string, int64_t>> watch_descs;
710 : : std::vector<std::pair<std::string, int64_t>> solvable_descs;
711 : : std::vector<std::unique_ptr<DescriptorScriptPubKeyMan>> desc_spkms;
712 : : std::shared_ptr<CWallet> watchonly_wallet{nullptr};
713 : : std::shared_ptr<CWallet> solvable_wallet{nullptr};
714 : : };
715 : :
716 : : } // namespace wallet
717 : :
718 : : #endif // BITCOIN_WALLET_SCRIPTPUBKEYMAN_H
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