75 lines
2.7 KiB
C++
75 lines
2.7 KiB
C++
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#include "ea_response.hpp"
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#include "asn1.hpp"
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#include "exception.hpp"
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#include "hashed_id8.hpp"
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#include "security_module.hpp"
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#include "signed_data.hpp"
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#include "validation.hpp"
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#include <vanetza/asn1/security/EtsiTs102941Data.h>
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#include <vanetza/asn1/security/InnerEcResponse.h>
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#include <vanetza/common/its_aid.hpp>
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namespace vanetza
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{
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namespace pki
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{
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EnrolmentResponse parse_enrolment_response(SecurityModule& security, const ByteBuffer& decrypted,
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const Certificate& ea_certificate)
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{
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SignedData outer;
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if (!outer.decode(decrypted)) {
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throw DecodingFailure("decoding signed enrolment response failed");
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}
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if (outer->content->present != Vanetza_Security_Ieee1609Dot2Content_PR_signedData) {
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throw DecodingFailure("enrolment response content is not signedData");
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}
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const Vanetza_Security_SignedData_t& sd = *outer->content->choice.signedData;
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// Per TS 102 941 §6.2.3.2.2 the EA signs enrolment responses with signer = digest(EA cert).
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const HashedId8 ea_hid8 = ea_certificate.calculate_hashed_id8(security);
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if (sd.signer.present != Vanetza_Security_SignerIdentifier_PR_digest) {
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throw DecodingFailure("enrolment response must have signer = digest");
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}
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if (sd.signer.choice.digest != ea_hid8.octets) {
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throw VerificationFailure("enrolment response signer digest does not match EA certificate");
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}
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if (sd.tbsData->headerInfo.psid != aid::SCR) {
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throw DecodingFailure("enrolment response PSID is not SCR");
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}
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if (!validate(security, sd, ea_certificate.raw())) {
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throw VerificationFailure("enrolment response signature does not verify against EA certificate");
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}
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const Vanetza_Security_Opaque_t* inner_opaque = get_signed_payload(outer->content);
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if (!inner_opaque) {
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throw DecodingFailure("enrolment response carries no unsecured signed payload");
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}
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EnrolmentResponseData inner = EnrolmentResponseData::from_opaque(*inner_opaque);
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if (inner->version != Vanetza_Security_Version_v1) {
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throw DecodingFailure("inner EtsiTs102941Data version is not v1");
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}
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const Vanetza_Security_InnerEcResponse_t& ec_resp = inner->content.choice.enrolmentResponse;
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EnrolmentResponse result;
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result.code = EnrolmentResponseCode { ec_resp.responseCode };
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result.request_hash.assign(ec_resp.requestHash.buf, ec_resp.requestHash.buf + ec_resp.requestHash.size);
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if (ec_resp.certificate) {
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result.certificate = Certificate(*ec_resp.certificate);
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}
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if (ec_resp.responseCode == Vanetza_Security_EnrolmentResponseCode_ok && !result.certificate) {
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throw DecodingFailure("enrolment response code is ok but no certificate is included");
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}
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return result;
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}
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} // namespace pki
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} // namespace vanetza
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