mirror of
https://github.com/oxen-io/lokinet.git
synced 2024-10-29 11:05:43 +00:00
333 lines
8.5 KiB
C++
333 lines
8.5 KiB
C++
#include <config/key_manager.hpp>
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#include <system_error>
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#include <util/logging/logger.hpp>
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#include "config/config.hpp"
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#include "crypto/crypto.hpp"
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#include "crypto/types.hpp"
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#ifndef _WIN32
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#include <curl/curl.h>
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#endif
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/// curl callback
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static size_t
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curl_RecvIdentKey(char *ptr, size_t, size_t nmemb, void *userdata)
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{
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for(size_t idx = 0; idx < nmemb; idx++)
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static_cast< std::vector< char > * >(userdata)->push_back(ptr[idx]);
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return nmemb;
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}
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namespace llarp
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{
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KeyManager::KeyManager()
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: m_initialized(false)
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{
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}
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bool
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KeyManager::initialize(const llarp::Config& config, bool genIfAbsent)
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{
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if (m_initialized)
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return false;
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m_rcPath = config.router.ourRcFile();
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m_idKeyPath = config.router.identKeyfile();
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m_encKeyPath = config.router.encryptionKeyfile();
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m_transportKeyPath = config.router.transportKeyfile();
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m_usingLokid = config.lokid.whitelistRouters;
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m_lokidRPCAddr = config.lokid.lokidRPCAddr;
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m_lokidRPCUser = config.lokid.lokidRPCUser;
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m_lokidRPCPassword = config.lokid.lokidRPCPassword;
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RouterContact rc;
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bool exists = rc.Read(m_rcPath.c_str());
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if (not exists and not genIfAbsent)
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{
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LogError("Could not read RouterContact at path ", m_rcPath);
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return false;
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}
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// if our RC file can't be verified, assume it is out of date (e.g. uses
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// older encryption) and needs to be regenerated. before doing so, backup
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// files that will be overwritten
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if (exists and not rc.VerifySignature())
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{
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if (! genIfAbsent)
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{
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LogError("Our RouterContact ", m_rcPath, " is invalid or out of date");
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return false;
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}
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else
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{
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LogWarn("Our RouterContact ", m_rcPath,
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" seems out of date, backing up and regenerating private keys");
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if (! backupKeyFilesByMoving())
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{
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LogError("Could not mv some key files, please ensure key files"
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" are backed up if needed and remove");
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return false;
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}
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}
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}
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if (not m_usingLokid)
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{
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// load identity key or create if needed
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auto identityKeygen = [](llarp::SecretKey& key)
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{
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// TODO: handle generating from service node seed
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llarp::CryptoManager::instance()->identity_keygen(key);
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};
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if (not loadOrCreateKey(m_idKeyPath, m_idKey, identityKeygen))
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return false;
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}
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else
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{
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if (not loadIdentityFromLokid())
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return false;
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}
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// load encryption key
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auto encryptionKeygen = [](llarp::SecretKey& key)
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{
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llarp::CryptoManager::instance()->encryption_keygen(key);
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};
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if (not loadOrCreateKey(m_encKeyPath, m_encKey, encryptionKeygen))
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return false;
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// TODO: transport key (currently done in LinkLayer)
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auto transportKeygen = [](llarp::SecretKey& key)
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{
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key.Zero();
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CryptoManager::instance()->encryption_keygen(key);
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};
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if (not loadOrCreateKey(m_transportKeyPath, m_transportKey, transportKeygen))
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return false;
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m_initialized = true;
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return true;
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}
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const llarp::SecretKey&
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KeyManager::getIdentityKey() const
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{
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return m_idKey;
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}
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const llarp::SecretKey&
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KeyManager::getEncryptionKey() const
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{
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return m_encKey;
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}
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const llarp::SecretKey&
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KeyManager::getTransportKey() const
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{
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return m_transportKey;
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}
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bool
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KeyManager::getRouterContact(llarp::RouterContact& rc) const
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{
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if (! m_initialized)
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return false;
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rc = m_rc;
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return true;
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}
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bool
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KeyManager::backupKeyFilesByMoving() const
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{
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auto findFreeBackupFilename = [](const fs::path& filepath) {
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for (int i=0; i<9; i++)
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{
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std::string ext("." + std::to_string(i) + ".bak");
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fs::path newPath = filepath;
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newPath += ext;
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if (not fs::exists(newPath))
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return newPath;
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}
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return fs::path();
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};
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std::vector<std::string> files = {
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m_rcPath,
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m_idKeyPath,
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m_encKeyPath,
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m_transportKeyPath
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};
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for (auto& filepath : files)
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{
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std::error_code ec;
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bool exists = fs::exists(filepath, ec);
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if (ec)
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{
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LogError("Could not determine status of file ", filepath, ": ", ec.message());
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return false;
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}
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if (not exists)
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{
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LogInfo("File ", filepath, " doesn't exist; no backup needed");
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continue;
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}
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fs::path newFilepath = findFreeBackupFilename(filepath);
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if (newFilepath.empty())
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{
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LogWarn("Could not find an appropriate backup filename for", filepath);
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return false;
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}
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LogInfo("Backing up (moving) key file ", filepath, " to ", newFilepath, "...");
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fs::rename(filepath, newFilepath, ec);
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if (ec) {
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LogError("Failed to move key file ", ec.message());
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return false;
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}
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}
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return true;
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}
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bool
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KeyManager::loadOrCreateKey(
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const std::string& filepath,
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llarp::SecretKey& key,
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std::function<void(llarp::SecretKey& key)> keygen)
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{
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fs::path path(filepath);
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std::error_code ec;
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if (! fs::exists(path, ec))
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{
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if (ec)
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{
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LogError("Error checking key", filepath, ec.message());
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return false;
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}
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LogInfo("Generating new key", filepath);
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keygen(key);
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if (! key.SaveToFile(filepath.c_str()))
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{
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LogError("Failed to save new key");
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return false;
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}
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}
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LogDebug("Loading key from file ", filepath);
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return key.LoadFromFile(filepath.c_str());
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}
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bool
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KeyManager::loadIdentityFromLokid()
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{
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CURL *curl = curl_easy_init();
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if(curl)
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{
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bool ret = false;
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std::stringstream ss;
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ss << "http://" << m_lokidRPCAddr << "/json_rpc";
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const auto url = ss.str();
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curl_easy_setopt(curl, CURLOPT_URL, url.c_str());
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curl_easy_setopt(curl, CURLOPT_HTTPAUTH, (long)CURLAUTH_ANY);
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const auto auth = m_lokidRPCUser + ":" + m_lokidRPCPassword;
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curl_easy_setopt(curl, CURLOPT_USERPWD, auth.c_str());
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curl_slist *list = nullptr;
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list = curl_slist_append(list, "Content-Type: application/json");
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curl_easy_setopt(curl, CURLOPT_HTTPHEADER, list);
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nlohmann::json request = {{"id", "0"},
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{"jsonrpc", "2.0"},
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{"method", "get_service_node_privkey"}};
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const auto data = request.dump();
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std::vector< char > resp;
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curl_easy_setopt(curl, CURLOPT_POSTFIELDSIZE, data.size());
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curl_easy_setopt(curl, CURLOPT_POSTFIELDS, data.c_str());
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curl_easy_setopt(curl, CURLOPT_WRITEDATA, &resp);
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curl_easy_setopt(curl, CURLOPT_WRITEFUNCTION, &curl_RecvIdentKey);
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do
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{
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resp.clear();
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LogInfo("Getting Identity Keys from lokid...");
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if(curl_easy_perform(curl) == CURLE_OK)
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{
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try
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{
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auto j = nlohmann::json::parse(resp);
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if(not j.is_object())
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continue;
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const auto itr = j.find("result");
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if(itr == j.end())
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continue;
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if(not itr->is_object())
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continue;
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const auto k =
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(*itr)["service_node_ed25519_privkey"].get< std::string >();
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if(k.size() != (m_idKey.size() * 2))
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{
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if(k.empty())
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{
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LogError("lokid gave no identity key");
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}
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else
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{
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LogError("lokid gave invalid identity key");
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}
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return false;
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}
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if(not HexDecode(k.c_str(), m_idKey.data(), m_idKey.size()))
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continue;
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if(CryptoManager::instance()->check_identity_privkey(m_idKey))
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{
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ret = true;
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}
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else
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{
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LogError("lokid gave bogus identity key");
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}
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}
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catch(nlohmann::json::exception &ex)
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{
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LogError("Bad response from lokid: ", ex.what());
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}
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}
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else
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{
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LogError("failed to get identity keys");
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}
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if(ret)
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{
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LogInfo("Got Identity Keys from lokid: ", RouterID(seckey_topublic(m_idKey)));
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break;
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}
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else
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{
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std::this_thread::sleep_for(std::chrono::milliseconds(100));
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}
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} while(true);
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curl_easy_cleanup(curl);
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curl_slist_free_all(list);
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return ret;
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}
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else
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{
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LogError("failed to init curl");
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return false;
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}
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}
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} // namespace llarp
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