Function InitRPCAuthentication

src/httprpc.cpp:249–338

}

static bool InitRPCAuthentication()
{
    std::string user;
    std::string pass;

    if (gArgs.GetArg("-rpcpassword", "") == "")
    {
        std::optional<fs::perms> cookie_perms{std::nullopt};
        auto cookie_perms_arg{gArgs.GetArg("-rpccookieperms")};
        if (cookie_perms_arg) {
            auto perm_opt = InterpretPermString(*cookie_perms_arg);
            if (!perm_opt) {
                LogError("Invalid -rpccookieperms=%s; must be one of 'owner', 'group', or 'all'.", *cookie_perms_arg);
                return false;
            }
            cookie_perms = *perm_opt;
        }

        switch (GenerateAuthCookie(cookie_perms, user, pass)) {
        case AuthCookieResult::Error:
            return false;
        case AuthCookieResult::Disabled:
            LogInfo("RPC authentication cookie file generation is disabled.");
            break;
        case AuthCookieResult::Ok:
            LogInfo("Using random cookie authentication.");
            break;
        }
    } else {
        LogInfo("Using rpcuser/rpcpassword authentication.");
        LogWarning("The use of rpcuser/rpcpassword is less secure, because credentials are configured in plain text. It is recommended that locally-run instances switch to cookie-based auth, or otherwise to use hashed rpcauth credentials. See share/rpcauth in the source directory for more information.");
        user = gArgs.GetArg("-rpcuser", "");
        pass = gArgs.GetArg("-rpcpassword", "");
    }

    // If there is a plaintext credential, hash it with a random salt before storage.
    if (!user.empty() || !pass.empty()) {
        // Generate a random 16 byte hex salt.
        std::array<unsigned char, 16> raw_salt;
        GetStrongRandBytes(raw_salt);
        std::string salt = HexStr(raw_salt);

        // Compute HMAC.
        std::array<unsigned char, CHMAC_SHA256::OUTPUT_SIZE> out;
        CHMAC_SHA256(UCharCast(salt.data()), salt.size()).Write(UCharCast(pass.data()), pass.size()).Finalize(out.data());
        std::string hash = HexStr(out);

        g_rpcauth.push_back({user, salt, hash});
    }

    if (!gArgs.GetArgs("-rpcauth").empty()) {
        LogInfo("Using rpcauth authentication.\n");
        for (const std::string& rpcauth : gArgs.GetArgs("-rpcauth")) {
            std::vector<std::string> fields{SplitString(rpcauth, ':')};
            const std::vector<std::string> salt_hmac{SplitString(fields.back(), '$')};
            if (fields.size() == 2 && salt_hmac.size() == 2) {
                fields.pop_back();
                fields.insert(fields.end(), salt_hmac.begin(), salt_hmac.end());