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Merge #11415: [RPC] Disallow using addresses in createmultisig

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1df206f Disallow using addresses in createmultisig (Andrew Chow)

Pull request description:

  This PR should be the last part of #7965.

  This PR makes createmultisig only accept public keys and marks the old functionality of accepting addresses as deprecated.

  It also splits `_createmultisig_redeemscript` into two functions, `_createmultisig_getpubkeys` and `_createmultisig_getaddr_pubkeys`. `_createmultisig_getpubkeys` retrieves public keys from the RPC parameters and `_createmultisig_getaddr_pubkeys` retrieves addresses' public keys from the wallet. `_createmultisig_getaddr_pubkeys` requires the wallet and is only used by `addwitnessaddress` (except when `createmultisig` is used in deprecated mode).

  `addwitnessaddress`'s API is also changed. Instead of returning just an address, it now returns the same thing as `createmultisig`: a JSON object with two fields, address and redeemscript.

Tree-SHA512: a5796e41935ad5e47d8165ff996a8b20d5112b5fc1a06a6d3c7f5513c13e7628a4fd37ec30fde05d8b15abfed51bc250710140f6834b13f64d0a0e47a3817969
This commit is contained in:
Wladimir J. van der Laan
2018-01-24 13:34:30 +01:00
parent 6e89de5ba7 1df206f854
commit 69ec021969
15 changed files with 204 additions and 126 deletions
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109
src/rpc/misc.cpp
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@@ -15,6 +15,7 @@
#include <netbase.h>
#include <rpc/blockchain.h>
#include <rpc/server.h>
#include <rpc/util.h>
#include <timedata.h>
#include <util.h>
#include <utilstrencodings.h>
@@ -254,88 +255,21 @@ UniValue validateaddress(const JSONRPCRequest& request)
// Needed even with !ENABLE_WALLET, to pass (ignored) pointers around
class CWallet;
/**
* Used by addmultisigaddress / createmultisig:
*/
CScript _createmultisig_redeemScript(CWallet * const pwallet, const UniValue& params)
{
int nRequired = params[0].get_int();
const UniValue& keys = params[1].get_array();
// Gather public keys
if (nRequired < 1)
throw std::runtime_error("a multisignature address must require at least one key to redeem");
if ((int)keys.size() < nRequired)
throw std::runtime_error(
strprintf("not enough keys supplied "
"(got %u keys, but need at least %d to redeem)", keys.size(), nRequired));
if (keys.size() > 16)
throw std::runtime_error("Number of addresses involved in the multisignature address creation > 16\nReduce the number");
std::vector<CPubKey> pubkeys;
pubkeys.resize(keys.size());
for (unsigned int i = 0; i < keys.size(); i++)
{
const std::string& ks = keys[i].get_str();
#ifdef ENABLE_WALLET
// Case 1: Bitcoin address and we have full public key:
CTxDestination dest = DecodeDestination(ks);
if (pwallet && IsValidDestination(dest)) {
CKeyID key = GetKeyForDestination(*pwallet, dest);
if (key.IsNull()) {
throw std::runtime_error(strprintf("%s does not refer to a key", ks));
}
CPubKey vchPubKey;
if (!pwallet->GetPubKey(key, vchPubKey)) {
throw std::runtime_error(strprintf("no full public key for address %s", ks));
}
if (!vchPubKey.IsFullyValid())
throw std::runtime_error(" Invalid public key: "+ks);
pubkeys[i] = vchPubKey;
}
// Case 2: hex public key
else
#endif
if (IsHex(ks))
{
CPubKey vchPubKey(ParseHex(ks));
if (!vchPubKey.IsFullyValid())
throw std::runtime_error(" Invalid public key: "+ks);
pubkeys[i] = vchPubKey;
}
else
{
throw std::runtime_error(" Invalid public key: "+ks);
}
}
CScript result = GetScriptForMultisig(nRequired, pubkeys);
if (result.size() > MAX_SCRIPT_ELEMENT_SIZE)
throw std::runtime_error(
strprintf("redeemScript exceeds size limit: %d > %d", result.size(), MAX_SCRIPT_ELEMENT_SIZE));
return result;
}
UniValue createmultisig(const JSONRPCRequest& request)
{
#ifdef ENABLE_WALLET
CWallet * const pwallet = GetWalletForJSONRPCRequest(request);
#else
CWallet * const pwallet = nullptr;
#endif
if (request.fHelp || request.params.size() < 2 || request.params.size() > 2)
{
std::string msg = "createmultisig nrequired [\"key\",...]\n"
"\nCreates a multi-signature address with n signature of m keys required.\n"
"It returns a json object with the address and redeemScript.\n"
"DEPRECATION WARNING: Using addresses with createmultisig is deprecated. Clients must\n"
"transition to using addmultisigaddress to create multisig addresses with addresses known\n"
"to the wallet before upgrading to v0.17. To use the deprecated functionality, start bitcoind with -deprecatedrpc=createmultisig\n"
"\nArguments:\n"
"1. nrequired (numeric, required) The number of required signatures out of the n keys or addresses.\n"
"2. \"keys\" (string, required) A json array of keys which are bitcoin addresses or hex-encoded public keys\n"
"1. nrequired (numeric, required) The number of required signatures out of the n keys or addresses.\n"
"2. \"keys\" (string, required) A json array of hex-encoded public keys\n"
" [\n"
" \"key\" (string) bitcoin address or hex-encoded public key\n"
" \"key\" (string) The hex-encoded public key\n"
" ,...\n"
" ]\n"
@@ -346,16 +280,37 @@ UniValue createmultisig(const JSONRPCRequest& request)
"}\n"
"\nExamples:\n"
"\nCreate a multisig address from 2 addresses\n"
+ HelpExampleCli("createmultisig", "2 \"[\\\"16sSauSf5pF2UkUwvKGq4qjNRzBZYqgEL5\\\",\\\"171sgjn4YtPu27adkKGrdDwzRTxnRkBfKV\\\"]\"") +
"\nCreate a multisig address from 2 public keys\n"
+ HelpExampleCli("createmultisig", "2 \"[\\\"03789ed0bb717d88f7d321a368d905e7430207ebbd82bd342cf11ae157a7ace5fd\\\",\\\"03dbc6764b8884a92e871274b87583e6d5c2a58819473e17e107ef3f6aa5a61626\\\"]\"") +
"\nAs a json rpc call\n"
+ HelpExampleRpc("createmultisig", "2, \"[\\\"16sSauSf5pF2UkUwvKGq4qjNRzBZYqgEL5\\\",\\\"171sgjn4YtPu27adkKGrdDwzRTxnRkBfKV\\\"]\"")
+ HelpExampleRpc("createmultisig", "2, \"[\\\"03789ed0bb717d88f7d321a368d905e7430207ebbd82bd342cf11ae157a7ace5fd\\\",\\\"03dbc6764b8884a92e871274b87583e6d5c2a58819473e17e107ef3f6aa5a61626\\\"]\"")
;
throw std::runtime_error(msg);
}
int required = request.params[0].get_int();
// Get the public keys
const UniValue& keys = request.params[1].get_array();
std::vector<CPubKey> pubkeys;
for (unsigned int i = 0; i < keys.size(); ++i) {
if (IsHex(keys[i].get_str()) && (keys[i].get_str().length() == 66 || keys[i].get_str().length() == 130)) {
pubkeys.push_back(HexToPubKey(keys[i].get_str()));
} else {
#ifdef ENABLE_WALLET
CWallet* const pwallet = GetWalletForJSONRPCRequest(request);
if (IsDeprecatedRPCEnabled("createmultisig") && EnsureWalletIsAvailable(pwallet, false)) {
pubkeys.push_back(AddrToPubKey(pwallet, keys[i].get_str()));
} else
#endif
throw JSONRPCError(RPC_INVALID_ADDRESS_OR_KEY, strprintf("Invalid public key: %s\nNote that from v0.16, createmultisig no longer accepts addresses."
" Clients must transition to using addmultisigaddress to create multisig addresses with addresses known to the wallet before upgrading to v0.17."
" To use the deprecated functionality, start bitcoind with -deprecatedrpc=createmultisig", keys[i].get_str()));
}
}
// Construct using pay-to-script-hash:
CScript inner = _createmultisig_redeemScript(pwallet, request.params);
CScript inner = CreateMultisigRedeemscript(required, pubkeys);
CScriptID innerID(inner);
UniValue result(UniValue::VOBJ);