'--verify-update', shasum support, OpenPGP signatures verification

1 files changed, 130 insertions, 0 deletions

diff --git a/src/qt/updater.cpp b/src/qt/updater.cpp
new file mode 100644
index 00000000..5968c2b5
--- /dev/null
+++ b/src/qt/updater.cpp
@@ -0,0 +1,130 @@
+// Copyright (c) 2020, The Monero Project
+//
+// All rights reserved.
+//
+// Redistribution and use in source and binary forms, with or without modification, are
+// permitted provided that the following conditions are met:
+//
+// 1. Redistributions of source code must retain the above copyright notice, this list of
+//    conditions and the following disclaimer.
+//
+// 2. Redistributions in binary form must reproduce the above copyright notice, this list
+//    of conditions and the following disclaimer in the documentation and/or other
+//    materials provided with the distribution.
+//
+// 3. Neither the name of the copyright holder nor the names of its contributors may be
+//    used to endorse or promote products derived from this software without specific
+//    prior written permission.
+//
+// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY
+// EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
+// MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL
+// THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+// PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
+// STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF
+// THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+#include "updater.h"
+
+#include <openpgp/hash.h>
+
+#include "utils.h"
+
+Updater::Updater()
+{
+    m_maintainers.emplace_back(fileGetContents(":/monero/utils/gpg_keys/binaryfate.asc").toStdString());
+    m_maintainers.emplace_back(fileGetContents(":/monero/utils/gpg_keys/fluffypony.asc").toStdString());
+    m_maintainers.emplace_back(fileGetContents(":/monero/utils/gpg_keys/luigi1111.asc").toStdString());
+}
+
+QPair<QString, QString> Updater::verifySignaturesAndHashSum(
+    const QByteArray &armoredSignedHashes,
+    const QByteArray &secondDetachedSignature,
+    const QString &binaryFilename,
+    const void *binaryData,
+    size_t binarySize) const
+{
+    QString firstSigner;
+    const QString signedMessage = verifySignature(armoredSignedHashes, firstSigner);
+
+    QString secondSigner = verifySignature(
+        epee::span<const uint8_t>(
+            reinterpret_cast<const uint8_t *>(armoredSignedHashes.data()),
+            armoredSignedHashes.size()),
+        openpgp::signature_rsa::from_buffer(epee::span<const uint8_t>(
+            reinterpret_cast<const uint8_t *>(secondDetachedSignature.data()),
+            secondDetachedSignature.size())));
+
+    if (firstSigner == secondSigner)
+    {
+        throw std::runtime_error("both signatures were generated by the same person");
+    }
+
+    const QByteArray signedHash = parseShasumOutput(signedMessage, binaryFilename);
+    const QByteArray calculatedHash = getHash(binaryData, binarySize);
+    if (signedHash != calculatedHash)
+    {
+        throw std::runtime_error("hash sum mismatch");
+    }
+
+    return {firstSigner, secondSigner};
+}
+
+QByteArray Updater::getHash(const void *data, size_t size) const
+{
+    openpgp::hash hasher(openpgp::hash::algorithm::sha256);
+    hasher << epee::span<const uint8_t>(reinterpret_cast<const uint8_t *>(data), size);
+    const std::vector<uint8_t> hash = hasher.finish();
+    return QByteArray(reinterpret_cast<const char *>(&hash[0]), hash.size());
+}
+
+QByteArray Updater::parseShasumOutput(const QString &message, const QString &filename) const
+{
+    for (const auto &line : message.splitRef("\n"))
+    {
+        const auto trimmed = line.trimmed();
+        if (trimmed.endsWith(filename))
+        {
+            const int pos = trimmed.indexOf(' ');
+            if (pos != -1)
+            {
+                return QByteArray::fromHex(trimmed.left(pos).toUtf8());
+            }
+        }
+        else if (trimmed.startsWith(filename))
+        {
+            const int pos = trimmed.lastIndexOf(' ');
+            if (pos != -1)
+            {
+                return QByteArray::fromHex(trimmed.right(trimmed.size() - pos).toUtf8());
+            }
+        }
+    }
+
+    throw std::runtime_error("hash not found");
+}
+
+QString Updater::verifySignature(const QByteArray &armoredSignedMessage, QString &signer) const
+{
+    const std::string messageString = armoredSignedMessage.toStdString();
+    const openpgp::message_armored signedMessage(messageString);
+    signer = verifySignature(signedMessage, openpgp::signature_rsa::from_armored(messageString));
+
+    const epee::span<const uint8_t> message = signedMessage;
+    return QString(QByteArray(reinterpret_cast<const char *>(&message[0]), message.size()));
+}
+
+QString Updater::verifySignature(const epee::span<const uint8_t> data, const openpgp::signature_rsa &signature) const
+{
+    for (const auto &maintainer : m_maintainers)
+    {
+        if (signature.verify(data, maintainer))
+        {
+            return QString::fromStdString(maintainer.user_id());
+        }
+    }
+
+    throw std::runtime_error("not signed by a maintainer");
+}