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 <external_signer.h>
6 : :
7 : : #include <chainparams.h>
8 : : #include <common/run_command.h>
9 : : #include <core_io.h>
10 : : #include <psbt.h>
11 : : #include <util/strencodings.h>
12 : :
13 : : #include <algorithm>
14 : : #include <stdexcept>
15 : : #include <string>
16 : : #include <vector>
17 : :
18 [ # # ][ # # ]: 0 : 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) {}
[ # # ]
19 : :
20 : 0 : std::string ExternalSigner::NetworkArg() const
21 : : {
22 : 0 : return " --chain " + m_chain;
23 : : }
24 : :
25 : 0 : bool ExternalSigner::Enumerate(const std::string& command, std::vector<ExternalSigner>& signers, const std::string chain)
26 : : {
27 : 2 : // Call <command> enumerate
28 [ # # ][ # # ]: 0 : const UniValue result = RunCommandParseJSON(command + " enumerate");
29 [ # # ][ # # ]: 0 : if (!result.isArray()) {
30 [ # # ][ # # ]: 0 : throw std::runtime_error(strprintf("'%s' received invalid response, expected array of signers", command));
[ # # ]
31 : : }
32 [ # # ][ # # ]: 0 : for (const UniValue& signer : result.getValues()) {
33 : : // Check for error
34 [ # # ]: 0 : const UniValue& error = signer.find_value("error");
35 [ # # ][ # # ]: 0 : if (!error.isNull()) {
36 [ # # ][ # # ]: 0 : if (!error.isStr()) {
37 [ # # ][ # # ]: 0 : throw std::runtime_error(strprintf("'%s' error", command));
[ # # ]
38 : : }
39 [ # # ][ # # ]: 0 : throw std::runtime_error(strprintf("'%s' error: %s", command, error.getValStr()));
[ # # ][ # # ]
40 : : }
41 : : // Check if fingerprint is present
42 [ # # ]: 0 : const UniValue& fingerprint = signer.find_value("fingerprint");
43 [ # # ][ # # ]: 0 : if (fingerprint.isNull()) {
44 [ # # ][ # # ]: 0 : throw std::runtime_error(strprintf("'%s' received invalid response, missing signer fingerprint", command));
[ # # ]
45 : : }
46 [ # # ]: 0 : const std::string& fingerprintStr{fingerprint.get_str()};
47 : : // Skip duplicate signer
48 : 0 : bool duplicate = false;
49 [ # # ]: 0 : for (const ExternalSigner& signer : signers) {
50 [ # # ][ # # ]: 0 : if (signer.m_fingerprint.compare(fingerprintStr) == 0) duplicate = true;
51 : : }
52 [ # # ]: 0 : if (duplicate) break;
53 : 0 : std::string name;
54 [ # # ]: 0 : const UniValue& model_field = signer.find_value("model");
55 [ # # ][ # # ]: 0 : if (model_field.isStr() && model_field.getValStr() != "") {
[ # # ][ # # ]
[ # # ]
56 [ # # ][ # # ]: 0 : name += model_field.getValStr();
57 : 0 : }
58 [ # # ]: 0 : signers.emplace_back(command, chain, fingerprintStr, name);
59 : 0 : }
60 : : return true;
61 : 0 : }
62 : :
63 : 0 : UniValue ExternalSigner::DisplayAddress(const std::string& descriptor) const
64 : : {
65 [ # # ][ # # ]: 0 : return RunCommandParseJSON(m_command + " --fingerprint \"" + m_fingerprint + "\"" + NetworkArg() + " displayaddress --desc \"" + descriptor + "\"");
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ]
66 : 0 : }
67 : :
68 : 0 : UniValue ExternalSigner::GetDescriptors(const int account)
69 : : {
70 [ # # ][ # # ]: 0 : return RunCommandParseJSON(m_command + " --fingerprint \"" + m_fingerprint + "\"" + NetworkArg() + " getdescriptors --account " + strprintf("%d", account));
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ][ # # ]
[ # # ]
71 : 0 : }
72 : :
73 : 0 : bool ExternalSigner::SignTransaction(PartiallySignedTransaction& psbtx, std::string& error)
74 : : {
75 : : // Serialize the PSBT
76 : 0 : DataStream ssTx{};
77 [ # # ]: 0 : ssTx << psbtx;
78 : : // parse ExternalSigner master fingerprint
79 [ # # ]: 0 : std::vector<unsigned char> parsed_m_fingerprint = ParseHex(m_fingerprint);
80 : : // Check if signer fingerprint matches any input master key fingerprint
81 : 0 : auto matches_signer_fingerprint = [&](const PSBTInput& input) {
82 [ # # ]: 0 : for (const auto& entry : input.hd_keypaths) {
83 [ # # ]: 0 : if (parsed_m_fingerprint == MakeUCharSpan(entry.second.fingerprint)) return true;
84 : : }
85 [ # # ]: 0 : for (const auto& entry : input.m_tap_bip32_paths) {
86 [ # # ]: 0 : if (parsed_m_fingerprint == MakeUCharSpan(entry.second.second.fingerprint)) return true;
87 : : }
88 : 0 : return false;
89 : 0 : };
90 : :
91 [ # # ][ # # ]: 0 : if (!std::any_of(psbtx.inputs.begin(), psbtx.inputs.end(), matches_signer_fingerprint)) {
92 [ # # ][ # # ]: 0 : error = "Signer fingerprint " + m_fingerprint + " does not match any of the inputs:\n" + EncodeBase64(ssTx.str());
[ # # ][ # # ]
[ # # ]
93 : 0 : return false;
94 : : }
95 : :
96 [ # # ][ # # ]: 0 : const std::string command = m_command + " --stdin --fingerprint \"" + m_fingerprint + "\"" + NetworkArg();
[ # # ][ # # ]
[ # # ]
97 [ # # ][ # # ]: 0 : const std::string stdinStr = "signtx \"" + EncodeBase64(ssTx.str()) + "\"";
[ # # ][ # # ]
98 : :
99 [ # # ]: 0 : const UniValue signer_result = RunCommandParseJSON(command, stdinStr);
100 : :
101 [ # # ][ # # ]: 0 : if (signer_result.find_value("error").isStr()) {
[ # # ]
102 [ # # ][ # # ]: 0 : error = signer_result.find_value("error").get_str();
[ # # ]
103 : 0 : return false;
104 : : }
105 : :
106 [ # # ][ # # ]: 0 : if (!signer_result.find_value("psbt").isStr()) {
[ # # ]
107 [ # # ]: 0 : error = "Unexpected result from signer";
108 : 0 : return false;
109 : : }
110 : :
111 [ # # ]: 0 : PartiallySignedTransaction signer_psbtx;
112 : 0 : std::string signer_psbt_error;
113 [ # # ][ # # ]: 0 : if (!DecodeBase64PSBT(signer_psbtx, signer_result.find_value("psbt").get_str(), signer_psbt_error)) {
[ # # ][ # # ]
114 [ # # ]: 0 : error = strprintf("TX decode failed %s", signer_psbt_error);
115 : 0 : return false;
116 : : }
117 : :
118 [ # # ]: 0 : psbtx = signer_psbtx;
119 : :
120 : 0 : return true;
121 : 0 : }
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