Branch data Line data Source code
1 : : // Copyright (c) 2018-2022 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 : : #include <chainparams.h>
6 : : #include <common/run_command.h>
7 : : #include <core_io.h>
8 : : #include <psbt.h>
9 : : #include <util/strencodings.h>
10 : : #include <external_signer.h>
11 : :
12 : : #include <algorithm>
13 : : #include <stdexcept>
14 : : #include <string>
15 : : #include <vector>
16 : :
17 [ + - ][ # # ]: 2 : ExternalSigner::ExternalSigner(const std::string& command, const std::string chain, const std::string& fingerprint, const std::string name): m_command(command), m_chain(chain), m_fingerprint(fingerprint), m_name(name) {}
[ # # ][ # # ]
18 [ + - ]: 2 :
19 : 0 : std::string ExternalSigner::NetworkArg() const
20 : : {
21 : 0 : return " --chain " + m_chain;
22 : : }
23 : :
24 : 0 : bool ExternalSigner::Enumerate(const std::string& command, std::vector<ExternalSigner>& signers, const std::string chain)
25 : : {
26 : : // Call <command> enumerate
27 [ # # ][ # # ]: 2 : const UniValue result = RunCommandParseJSON(command + " enumerate");
28 [ # # ][ # # ]: 0 : if (!result.isArray()) {
29 [ # # ][ # # ]: 0 : throw std::runtime_error(strprintf("'%s' received invalid response, expected array of signers", command));
[ # # ]
30 : : }
31 [ # # ][ # # ]: 0 : for (const UniValue& signer : result.getValues()) {
32 : : // Check for error
33 [ # # ]: 0 : const UniValue& error = signer.find_value("error");
34 [ # # ][ # # ]: 0 : if (!error.isNull()) {
35 [ # # ][ # # ]: 0 : if (!error.isStr()) {
36 [ # # ][ # # ]: 0 : throw std::runtime_error(strprintf("'%s' error", command));
[ # # ]
37 : : }
38 [ # # ][ # # ]: 0 : throw std::runtime_error(strprintf("'%s' error: %s", command, error.getValStr()));
[ # # ][ # # ]
39 : : }
40 : : // Check if fingerprint is present
41 [ # # ]: 0 : const UniValue& fingerprint = signer.find_value("fingerprint");
42 [ # # ][ # # ]: 0 : if (fingerprint.isNull()) {
43 [ # # ][ # # ]: 0 : throw std::runtime_error(strprintf("'%s' received invalid response, missing signer fingerprint", command));
[ # # ]
44 : : }
45 [ # # ]: 0 : const std::string& fingerprintStr{fingerprint.get_str()};
46 : : // Skip duplicate signer
47 : 0 : bool duplicate = false;
48 [ # # ]: 0 : for (const ExternalSigner& signer : signers) {
49 [ # # ][ # # ]: 0 : if (signer.m_fingerprint.compare(fingerprintStr) == 0) duplicate = true;
50 : : }
51 [ # # ]: 0 : if (duplicate) break;
52 : 0 : std::string name;
53 [ # # ]: 0 : const UniValue& model_field = signer.find_value("model");
54 [ # # ][ # # ]: 0 : if (model_field.isStr() && model_field.getValStr() != "") {
[ # # ][ # # ]
[ # # ]
55 [ # # ][ # # ]: 0 : name += model_field.getValStr();
56 : 0 : }
57 [ # # ]: 0 : signers.emplace_back(command, chain, fingerprintStr, name);
58 : 0 : }
59 : : return true;
60 : 0 : }
61 : :
62 : 0 : UniValue ExternalSigner::DisplayAddress(const std::string& descriptor) const
63 : : {
64 [ # # ][ # # ]: 0 : return RunCommandParseJSON(m_command + " --fingerprint \"" + m_fingerprint + "\"" + NetworkArg() + " displayaddress --desc \"" + descriptor + "\"");
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ]
65 : 0 : }
66 : :
67 : 0 : UniValue ExternalSigner::GetDescriptors(const int account)
68 : : {
69 [ # # ][ # # ]: 0 : return RunCommandParseJSON(m_command + " --fingerprint \"" + m_fingerprint + "\"" + NetworkArg() + " getdescriptors --account " + strprintf("%d", account));
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ]
70 : 0 : }
71 : :
72 : 0 : bool ExternalSigner::SignTransaction(PartiallySignedTransaction& psbtx, std::string& error)
73 : : {
74 : : // Serialize the PSBT
75 : 0 : CDataStream ssTx(SER_NETWORK, PROTOCOL_VERSION);
76 [ # # ]: 0 : ssTx << psbtx;
77 : : // parse ExternalSigner master fingerprint
78 [ # # ]: 0 : std::vector<unsigned char> parsed_m_fingerprint = ParseHex(m_fingerprint);
79 : : // Check if signer fingerprint matches any input master key fingerprint
80 : 0 : auto matches_signer_fingerprint = [&](const PSBTInput& input) {
81 [ # # ]: 0 : for (const auto& entry : input.hd_keypaths) {
82 [ # # ]: 0 : if (parsed_m_fingerprint == MakeUCharSpan(entry.second.fingerprint)) return true;
83 : : }
84 [ # # ]: 0 : for (const auto& entry : input.m_tap_bip32_paths) {
85 [ # # ]: 0 : if (parsed_m_fingerprint == MakeUCharSpan(entry.second.second.fingerprint)) return true;
86 : : }
87 : 0 : return false;
88 : 0 : };
89 : :
90 [ # # ][ # # ]: 0 : if (!std::any_of(psbtx.inputs.begin(), psbtx.inputs.end(), matches_signer_fingerprint)) {
91 [ # # ][ # # ]: 0 : error = "Signer fingerprint " + m_fingerprint + " does not match any of the inputs:\n" + EncodeBase64(ssTx.str());
[ # # ][ # # ]
[ # # ]
92 : 0 : return false;
93 : : }
94 : :
95 [ # # ][ # # ]: 0 : const std::string command = m_command + " --stdin --fingerprint \"" + m_fingerprint + "\"" + NetworkArg();
[ # # ][ # # ]
[ # # ]
96 [ # # ][ # # ]: 0 : const std::string stdinStr = "signtx \"" + EncodeBase64(ssTx.str()) + "\"";
[ # # ][ # # ]
97 : :
98 [ # # ]: 0 : const UniValue signer_result = RunCommandParseJSON(command, stdinStr);
99 : :
100 [ # # ][ # # ]: 0 : if (signer_result.find_value("error").isStr()) {
[ # # ]
101 [ # # ][ # # ]: 0 : error = signer_result.find_value("error").get_str();
[ # # ]
102 : 0 : return false;
103 : : }
104 : :
105 [ # # ][ # # ]: 0 : if (!signer_result.find_value("psbt").isStr()) {
[ # # ]
106 [ # # ]: 0 : error = "Unexpected result from signer";
107 : 0 : return false;
108 : : }
109 : :
110 [ # # ]: 0 : PartiallySignedTransaction signer_psbtx;
111 : 0 : std::string signer_psbt_error;
112 [ # # ][ # # ]: 0 : if (!DecodeBase64PSBT(signer_psbtx, signer_result.find_value("psbt").get_str(), signer_psbt_error)) {
[ # # ][ # # ]
113 [ # # ]: 0 : error = strprintf("TX decode failed %s", signer_psbt_error);
114 : 0 : return false;
115 : : }
116 : :
117 [ # # ]: 0 : psbtx = signer_psbtx;
118 : :
119 : 0 : return true;
120 : 0 : }
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