Ashin Walpola
d107534eb2
obu-firmware builds against the vanetza-idf C-ITS library, which until now came from the colleague's microbu-esp32c5 tree beside the repository and was not tracked here, so a clone of this repository could not build the firmware it ships. The library alone is now part of obu-firmware, as obu-firmware/external/vanetza-idf: their external/vanetza-idf at commit cf4b99f, unchanged (9775 files; see its PROVENANCE.md). CMake takes it from there by default; -DVANETZA_IDF_DIR still points the build elsewhere. The rest of the colleague's tree (their own VAM firmware, PKI tooling, station-link Python tools, the V2X2MAP bridge) stays out of this repository and gitignored; nothing is pushed to their repository. NOTES.md, docs/06, TODO.md and the pcap verifier's usage line point at the new location.
120 lines
4.2 KiB
C++
120 lines
4.2 KiB
C++
#include "ea_request.hpp"
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#include "asn1.hpp"
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#include "certificate.hpp"
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#include "encrypted_data.hpp"
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#include "exception.hpp"
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#include "psid_ssp.hpp"
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#include "security_module.hpp"
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#include "signed_builder.hpp"
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#include "signed_data.hpp"
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#include <vanetza/asn1/security/InnerEcRequest.h>
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#include <vanetza/common/its_aid.hpp>
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#include <stdexcept>
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namespace vanetza
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{
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namespace pki
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{
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namespace
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{
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class InnerEcRequest : public asn1::asn1c_oer_wrapper<Vanetza_Security_InnerEcRequest_t>
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{
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public:
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using wrapper = asn1::asn1c_oer_wrapper<Vanetza_Security_InnerEcRequest_t>;
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InnerEcRequest() : wrapper(asn_DEF_Vanetza_Security_InnerEcRequest)
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{
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m_struct->certificateFormat = Vanetza_Security_CertificateFormat_ts103097v131;
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}
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void set_its_id(const std::string& id)
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{
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if (OCTET_STRING_fromBuf(&m_struct->itsId, id.data(), id.size()) != 0) {
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throw std::runtime_error("setting ITS ID failed");
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}
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}
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void set_verification_key(const PublicKey& pubkey)
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{
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pki::set_verification_key(m_struct->publicKeys.verificationKey, pubkey);
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}
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void add_permission(const PsidSsp& perm)
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{
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if (m_struct->requestedSubjectAttributes.appPermissions == nullptr) {
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m_struct->requestedSubjectAttributes.appPermissions =
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asn1::allocate<Vanetza_Security_SequenceOfPsidSsp_t>();
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}
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auto psid_ssp = asn1::allocate<Vanetza_Security_PsidSsp_t>();
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psid_ssp->psid = perm.psid;
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if (!perm.ssp.empty()) {
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psid_ssp->ssp = asn1::allocate<Vanetza_Security_ServiceSpecificPermissions_t>();
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psid_ssp->ssp->present = Vanetza_Security_ServiceSpecificPermissions_PR_bitmapSsp;
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copy(perm.ssp, psid_ssp->ssp->choice.bitmapSsp);
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}
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auto* perms = m_struct->requestedSubjectAttributes.appPermissions;
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if (asn_sequence_add(perms, psid_ssp) != 0) {
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throw std::runtime_error("adding app permission to InnerEcRequest failed");
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}
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}
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};
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} // namespace
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ByteBuffer build_signed_enrolment_request(SecurityModule& security, const EnrolmentRequestParameters& params)
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{
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if (params.its_id.empty()) {
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throw std::invalid_argument("EnrolmentRequest: its_id must not be empty");
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}
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// 1. InnerEcRequest
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InnerEcRequest inner;
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inner.set_its_id(params.its_id);
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inner.set_verification_key(params.verification_key);
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inner.add_permission(PsidSsp { aid::SCR, { 0x01, 0xC0 } });
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if (!inner.validate()) {
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throw std::runtime_error("EnrolmentRequest: constructed InnerEcRequest is invalid");
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}
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// 2. InnerEcRequestSignedForPop wrapped in EtsiTs102941Data
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MgmtData pop_data;
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pop_data->version = Vanetza_Security_Version_v1;
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pop_data->content.present = Vanetza_Security_EtsiTs102941DataContent_PR_enrolmentRequest;
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// Inner PoP is always signer = self (TS 102 941 §6.2.3.2.1)
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create_signed(inner.encode(), security, params.verification_key, params.hash_algo, nullptr)
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.move_into(pop_data->content.choice.enrolmentRequest);
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// 3. Outer EtsiTs103097Data-Signed: signer = self for initial enrolment or
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// signer = digest(outer_signer_certificate) for a re-keying renewal.
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SignedData outer = create_signed(pop_data.encode(), security, params.outer_signer_key, params.hash_algo,
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params.outer_signer_certificate);
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return outer.encode();
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}
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EncryptedData build_enrolment_request(SecurityModule& security, const EnrolmentRequestParameters& params,
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const Certificate& ea_certificate)
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{
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boost::optional<PublicKey> ea_enckey = ea_certificate.get_encryption_key();
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if (!ea_enckey) {
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throw DecodingFailure("EnrolmentRequest: EA certificate has no encryption key");
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}
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ByteBuffer signed_request = build_signed_enrolment_request(security, params);
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Sha256Hash ea_cert_sha256 = calculate_sha256_hash(security, ea_certificate);
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auto ecies_unique = security.create_ecies_context(*ea_enckey, ea_cert_sha256);
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std::shared_ptr<SecurityModule::EciesContext> ecies { std::move(ecies_unique) };
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EncryptedData encrypted { ecies };
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encrypted.generate_ciphertext(signed_request);
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encrypted.add_recipient_info(ea_certificate.calculate_hashed_id8(security));
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return encrypted;
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}
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} // namespace pki
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} // namespace vanetza
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