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scd:piv: Add feature to read Yubikey attestation certificates.

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* scd/app-piv.c (do_readcert): Add hack to read Yubikey attestaions.
--

Use
  gpg-card 'readcert PIV.ATST.9A >x.crt'
to store the attestation certificate for 9A into X.CRT.

Signed-off-by: Werner Koch <wk@gnupg.org>
This commit is contained in:
Werner Koch 2019-03-01 14:04:29 +01:00
parent 696d4c290d
commit 51df13d9ec
No known key found for this signature in database
GPG Key ID: E3FDFF218E45B72B
1 changed files with 28 additions and 2 deletions
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30
scd/app-piv.c
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@ -182,6 +182,9 @@ static struct data_object_s data_objects[] = {
* "97" Secondary Finger OCC
* "98" Pairing Code
* "9B" PIV Card Application Administration Key
*
* Yubikey specific data objects:
* "F9" Attestation key (preloaded can be replaced)
*/
};
@ -1044,7 +1047,6 @@ set_adm_key (app_t app, const unsigned char *value, size_t valuelen)
return err;
}
/* Handle the SETATTR operation. All arguments are already basically
* checked. */
static gpg_error_t
@ -1167,7 +1169,7 @@ do_learn_status (app_t app, ctrl_t ctrl, unsigned int flags)
* given tag and returns it in a freshly allocated buffer stored at
* R_CERT and the length of the certificate stored at R_CERTLEN. If
* on success a non-zero value is stored at R_MECHANISM, the returned
* data is not certificate but a public key (in the format used by the
* data is not a certificate but a public key (in the format used by the
* container '7f49'. */
static gpg_error_t
readcert_by_tag (app_t app, unsigned int tag,
@ -1396,6 +1398,30 @@ do_readcert (app_t app, const char *certid,
*r_cert = NULL;
*r_certlen = 0;
/* Hack to read a Yubikey attestation certificate. */
if (app->app_local->flags.yubikey
&& strlen (certid) == 11
&& !ascii_strncasecmp (certid, "PIV.ATST.", 9)
&& hexdigitp (certid+9) && hexdigitp (certid+10))
{
unsigned char apdu[4];
unsigned char *result;
size_t resultlen;
apdu[0] = 0;
apdu[1] = 0xf9; /* Yubikey: Get attestation cert. */
apdu[2] = xtoi_2 (certid+9);
apdu[3] = 0;
err = iso7816_apdu_direct (app->slot, apdu, 4, 1,
NULL, &result, &resultlen);
if (!err)
{
*r_cert = result;
*r_certlen = resultlen;
}
return err;
}
dobj = find_dobj_by_keyref (app, certid);
if (!dobj)
return gpg_error (GPG_ERR_INV_ID);