95 lines
2.9 KiB
C++
95 lines
2.9 KiB
C++
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#include <vanetza/security/v2/verification.hpp>
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namespace vanetza
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{
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namespace security
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{
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namespace v2
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{
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bool check_generation_time(const SecuredMessage& message, Clock::time_point now)
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{
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using namespace std::chrono;
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bool valid = false;
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const Time64* generation_time = message.header_field<HeaderFieldType::Generation_Time>();
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if (generation_time) {
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// Values are picked from C2C-CC Basic System Profile v1.1.0, see RS_BSP_168
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static const auto generation_time_future = milliseconds(40);
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static const Clock::duration generation_time_past_default = minutes(10);
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static const Clock::duration generation_time_past_ca = seconds(2);
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auto generation_time_past = generation_time_past_default;
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const IntX* its_aid = message.header_field<HeaderFieldType::Its_Aid>();
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if (its_aid && aid::CA == *its_aid) {
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generation_time_past = generation_time_past_ca;
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}
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if (*generation_time > convert_time64(now + generation_time_future)) {
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valid = false;
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} else if (*generation_time < convert_time64(now - generation_time_past)) {
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valid = false;
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} else {
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valid = true;
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}
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}
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return valid;
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}
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bool check_generation_location(const SecuredMessage& message, const Certificate& cert)
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{
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const IntX* its_aid = message.header_field<HeaderFieldType::Its_Aid>();
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if (its_aid && aid::CA == *its_aid) {
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return true; // no check required for CAMs, field not even allowed
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}
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const ThreeDLocation* generation_location = message.header_field<HeaderFieldType::Generation_Location>();
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if (generation_location) {
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auto region = cert.get_restriction<ValidityRestrictionType::Region>();
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if (!region || get_type(*region) == RegionType::None) {
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return true;
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}
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return is_within(TwoDLocation(*generation_location), *region);
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}
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return false;
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}
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bool check_certificate_time(const Certificate& certificate, Clock::time_point now)
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{
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auto time = certificate.get_restriction<ValidityRestrictionType::Time_Start_And_End>();
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auto time_now = convert_time32(now);
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if (!time) {
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return false; // must be present
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}
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if (time->start_validity > time_now || time->end_validity < time_now) {
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return false; // premature or outdated
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}
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return true;
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}
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bool check_certificate_region(const Certificate& certificate, const PositionFix& position)
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{
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auto region = certificate.get_restriction<ValidityRestrictionType::Region>();
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if (!region || get_type(*region) == RegionType::None) {
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return true;
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}
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if (!position.confidence) {
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return false; // cannot check region restrictions without good position fix
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}
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return is_within(TwoDLocation(position.latitude, position.longitude), *region);
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}
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} // namespace v2
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} // namespace security
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} // namespace vanetza
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