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// Copyright Vespa.ai. Licensed under the terms of the Apache 2.0 license. See LICENSE in the project root.
#include "platform-specific.h"
#include <vespa/vespalib/util/error.h>
#include <cstdlib>
#include <string_view>
#ifdef __linux__
#include <sys/prctl.h>
#endif
#include <vespa/log/log.h>
LOG_SETUP(".sentinel.platform-specific");
using namespace std::string_view_literals;
namespace config::platform_specific {
namespace {
[[maybe_unused]] [[nodiscard]]
bool is_env_toggled(const char* var_name) {
const char* maybe_toggled = getenv(var_name);
return (maybe_toggled && (maybe_toggled == "true"sv || maybe_toggled == "yes"sv));
}
}
void pledge_no_new_privileges_if_env_configured() {
#ifdef __linux__
if (is_env_toggled("VESPA_PR_SET_NO_NEW_PRIVS")) {
// One-way toggle to prevent any subprocess from possibly getting extra privileges via
// setuid/setgid executables (modulo exciting things like kernel bugs or a small, trained
// rat that climbs into your computer and pulls an adorably tiny lever labeled "root access").
// Helps mitigate a certain class of vulnerabilities, and also allows processes to install
// their own seccomp filters.
// See https://www.kernel.org/doc/Documentation/prctl/no_new_privs.txt
if (prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0) != 0) {
LOG(warning, "Failed to invoke prctl(PR_SET_NO_NEW_PRIVS): %s", vespalib::getErrorString(errno).c_str());
} else {
LOG(debug, "Successfully invoked prctl(PR_SET_NO_NEW_PRIVS)");
}
}
#endif
}
}
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