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Added x509 extensions to attesting certificates.

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Signed-off-by: Pol Henarejos <pol.henarejos@cttc.es>
This commit is contained in:
Pol Henarejos
2024-03-27 19:12:14 +01:00
parent 877e5c0a5c
commit a9797ae1ba
1 changed files with 26 additions and 8 deletions
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34
src/openpgp/piv.c
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@@ -80,6 +80,16 @@ uint8_t session_pwpiv[32];
int piv_process_apdu();
static int get_serial() {
#ifndef ENABLE_EMULATION
pico_unique_board_id_t unique_id;
pico_get_unique_board_id(&unique_id);
uint32_t serial = (unique_id.id[0] & 7F) << 24 | unique_id.id[1] << 16 | unique_id.id[2] << 8 | unique_id.id[3];
return serial;
#else
return 0;
#endif
}
static int x509_create_cert(void *pk_ctx, uint8_t algo, uint8_t slot, bool attestation, uint8_t *buffer, size_t buffer_size) {
mbedtls_x509write_cert ctx;
@@ -112,6 +122,17 @@ static int x509_create_cert(void *pk_ctx, uint8_t algo, uint8_t slot, bool attes
mbedtls_pk_setup(&ikey, mbedtls_pk_info_from_type(MBEDTLS_PK_ECKEY));
ikey.pk_ctx = &actx;
mbedtls_x509write_crt_set_issuer_key(&ctx, &ikey);
uint8_t ver[] = {PIV_VERSION_MAJOR, PIV_VERSION_MINOR, 0};
mbedtls_x509write_crt_set_extension(&ctx, "\x2B\x06\x01\x04\x01\x82\xC4\x0A\x03\x03", 10, 0, ver, sizeof(ver));
uint32_t serial = get_serial();
mbedtls_x509write_crt_set_extension(&ctx, "\x2B\x06\x01\x04\x01\x82\xC4\x0A\x03\x07", 10, 0, (const uint8_t *)&serial, sizeof(serial));
int meta_len = 0;
uint8_t *meta;
if ((meta_len = meta_find(slot, &meta)) >= 0) {
mbedtls_x509write_crt_set_extension(&ctx, "\x2B\x06\x01\x04\x01\x82\xC4\x0A\x03\x08", 10, 0, &meta[1], 2);
}
uint8_t v = 1;
mbedtls_x509write_crt_set_extension(&ctx, "\x2B\x06\x01\x04\x01\x82\xC4\x0A\x03\x09", 10, 0, &v, sizeof(serial));
}
else {
uint8_t wslot = slot;
@@ -324,14 +345,11 @@ int piv_parse_discovery(const file_t *ef) {
}
static int cmd_get_serial() {
#ifndef ENABLE_EMULATION
pico_unique_board_id_t unique_id;
pico_get_unique_board_id(&unique_id);
memcpy(res_APDU, unique_id.id, 4);
#else
memset(res_APDU, 0, 4);
#endif
res_APDU_size = 4;
uint32_t serial = get_serial();
res_APDU[res_APDU_size++] = serial >> 24;
res_APDU[res_APDU_size++] = serial >> 16;
res_APDU[res_APDU_size++] = serial >> 8;
res_APDU[res_APDU_size++] = serial & 0xFF;
return SW_OK();
}