121 lines
3.2 KiB
C++
121 lines
3.2 KiB
C++
#include "U2F_Authenticate_APDU.hpp"
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#include "Field.hpp"
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#include "U2FMessage.hpp"
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#include "u2f.hpp"
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#include "Field.tpp"
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#include "APDU.hpp"
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#include <iostream>
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#include "Signature.hpp"
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#include "micro-ecc/uECC.h"
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#include <mbedtls/sha256.h>
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using namespace std;
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U2F_Authenticate_APDU::U2F_Authenticate_APDU(const U2F_Msg_CMD &msg, const vector<uint8_t> &data)
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: U2F_Msg_CMD{ msg }
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{
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if (data.size() < 66)
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throw runtime_error{ "Invalid authentication request" };
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copy(data.begin() + 0, data.begin() + 32, challengeP.begin());
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copy(data.begin() + 32, data.begin() + 64, appParam.begin());
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uint8_t keyHLen = data[64];
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copy(data.begin() + 65, data.begin() + 65 + keyHLen, back_inserter(keyH));
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clog << "Got U2F_Auth request" << endl;
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}
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void U2F_Authenticate_APDU::respond()
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{
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U2FMessage msg{};
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msg.cid = 0xF1D0F1D0;
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msg.cmd = U2FHID_MSG;
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auto statusCode = APDU_STATUS::SW_NO_ERROR;
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auto &response = msg.data;
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if (keyH.size() != sizeof(Storage::KeyHandle))
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{
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//Respond with error code - key handle is of wrong size
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clog << "Invalid key handle length" << endl;
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statusCode = APDU_STATUS::SW_WRONG_DATA;
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response.insert(response.end(), FIELD_BE(statusCode));
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msg.write();
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return;
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}
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auto keyHB = *reinterpret_cast<const Storage::KeyHandle*>(keyH.data());
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if (Storage::appParams.find(keyHB) == Storage::appParams.end())
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{
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//Respond with error code - key handle doesn't exist in storage
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clog << "Invalid key handle" << endl;
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statusCode = APDU_STATUS::SW_WRONG_DATA;
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response.insert(response.end(), FIELD_BE(statusCode));
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msg.write();
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return;
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}
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auto appMatches = (Storage::appParams.at(keyHB) == appParam);
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switch (p1)
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{
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case ControlCode::CheckOnly:
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if (appMatches)
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statusCode = APDU_STATUS::SW_CONDITIONS_NOT_SATISFIED;
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else
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statusCode = APDU_STATUS::SW_WRONG_DATA;
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response.insert(response.end(), FIELD_BE(statusCode));
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msg.write();
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return;
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case ControlCode::EnforcePresenceSign:
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//Continue processing
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case ControlCode::DontEnforcePresenceSign:
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//Continue processing
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break;
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default:
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cerr << "Unknown APDU command" << endl;
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statusCode = APDU_STATUS::SW_WRONG_DATA;
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response.insert(response.end(), FIELD_BE(statusCode));
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msg.write();
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return;
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}
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const auto& privKey = Storage::privKeys[keyHB];
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auto& keyCount = Storage::keyCounts[keyHB];
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keyCount++;
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response.push_back(0x01);
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response.insert(response.end(), FIELD_BE(keyCount));
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Digest digest;
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{
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mbedtls_sha256_context shaContext;
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mbedtls_sha256_init(&shaContext);
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mbedtls_sha256_starts(&shaContext, 0);
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mbedtls_sha256_update(&shaContext, reinterpret_cast<const uint8_t *>(appParam.data()), sizeof(appParam));
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uint8_t userPresence{ 1u };
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mbedtls_sha256_update(&shaContext, &userPresence, 1);
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const auto beCounter = beEncode(keyCount);
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mbedtls_sha256_update(&shaContext, beCounter.data(), beCounter.size());
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mbedtls_sha256_update(&shaContext, challengeP.data(), challengeP.size());
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mbedtls_sha256_finish(&shaContext, digest.data());
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mbedtls_sha256_free(&shaContext);
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}
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Signature signature{};
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uECC_sign(privKey.data(), digest.data(), digest.size(), signature.data(), uECC_secp256r1());
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appendSignatureAsDER(response, signature);
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response.insert(response.end(), FIELD_BE(statusCode));
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msg.write();
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}
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