Ashin Walpola
0e9525162d
obu-firmware builds against vanetza-idf from microbu-esp32c5/external, but that tree was gitignored, so a clone of this repository could not build the firmware it ships. It is now committed here as ordinary files in its own folder, microbu-esp32c5/: the colleague's commit cf4b99f plus the V2X2MAP bridge's signature verification (--trust) used on the bench. Nothing is fetched from or pushed to the colleague's repository; this repository and its remotes carry everything. The folder's own .gitignore keeps build output, downloaded components and private key material out, as it did there; the committed file set is identical to that repository's tracked files. The ESP32-C5 is still flashed from obu-firmware/, which only takes vanetza-idf from microbu-esp32c5/, so the two stay separate folders. FLASHING.md says how to take a newer version of the colleague's tree (copy it over the folder, rebuild, test, commit).
75 lines
2.8 KiB
C++
75 lines
2.8 KiB
C++
#include "at_response.hpp"
|
|
#include "asn1.hpp"
|
|
#include "exception.hpp"
|
|
#include "hashed_id8.hpp"
|
|
#include "security_module.hpp"
|
|
#include "signed_data.hpp"
|
|
#include "validation.hpp"
|
|
#include <vanetza/asn1/security/EtsiTs102941Data.h>
|
|
#include <vanetza/asn1/security/InnerAtResponse.h>
|
|
#include <vanetza/common/its_aid.hpp>
|
|
|
|
namespace vanetza
|
|
{
|
|
namespace pki
|
|
{
|
|
|
|
AuthorizationResponse parse_authorization_response(SecurityModule& security, const ByteBuffer& decrypted,
|
|
const Certificate& aa_certificate)
|
|
{
|
|
SignedData outer;
|
|
if (!outer.decode(decrypted)) {
|
|
throw DecodingFailure("decoding signed authorization response failed");
|
|
}
|
|
if (outer->content->present != Vanetza_Security_Ieee1609Dot2Content_PR_signedData) {
|
|
throw DecodingFailure("authorization response content is not signedData");
|
|
}
|
|
const Vanetza_Security_SignedData_t& sd = *outer->content->choice.signedData;
|
|
|
|
// Per TS 102 941 §6.2.3.3.2 the AA signs with signer = digest(AA cert).
|
|
const HashedId8 aa_hid8 = aa_certificate.calculate_hashed_id8(security);
|
|
if (sd.signer.present != Vanetza_Security_SignerIdentifier_PR_digest) {
|
|
throw DecodingFailure("authorization response must have signer = digest");
|
|
}
|
|
if (sd.signer.choice.digest != aa_hid8.octets) {
|
|
throw VerificationFailure("authorization response signer digest does not match AA certificate");
|
|
}
|
|
|
|
if (sd.tbsData->headerInfo.psid != aid::SCR) {
|
|
throw DecodingFailure("authorization response PSID is not SCR");
|
|
}
|
|
|
|
if (!validate(security, sd, aa_certificate.raw())) {
|
|
throw VerificationFailure("authorization response signature does not verify against AA certificate");
|
|
}
|
|
|
|
const Vanetza_Security_Opaque_t* inner_opaque = get_signed_payload(outer->content);
|
|
if (!inner_opaque) {
|
|
throw DecodingFailure("authorization response carries no unsecured signed payload");
|
|
}
|
|
|
|
AuthorizationResponseData inner = AuthorizationResponseData::from_opaque(*inner_opaque);
|
|
if (inner->version != Vanetza_Security_Version_v1) {
|
|
throw DecodingFailure("inner EtsiTs102941Data version is not v1");
|
|
}
|
|
|
|
const Vanetza_Security_InnerAtResponse_t& at_resp = inner->content.choice.authorizationResponse;
|
|
|
|
AuthorizationResponse result;
|
|
result.code = AuthorizationResponseCode { at_resp.responseCode };
|
|
result.request_hash.assign(at_resp.requestHash.buf, at_resp.requestHash.buf + at_resp.requestHash.size);
|
|
|
|
if (at_resp.certificate) {
|
|
result.certificate = Certificate(*at_resp.certificate);
|
|
}
|
|
|
|
if (at_resp.responseCode == Vanetza_Security_AuthorizationResponseCode_ok && !result.certificate) {
|
|
throw DecodingFailure("authorization response code is ok but no certificate is included");
|
|
}
|
|
|
|
return result;
|
|
}
|
|
|
|
} // namespace pki
|
|
} // namespace vanetza
|